1 // Copyright 2013 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
24 // pkgFor parses and type checks the package specified by path and source,
25 // populating info if provided.
26 func pkgFor(path, source string, info *Info) (*Package, error) {
27 return pkgForMode(path, source, info, 0)
30 func pkgForMode(path, source string, info *Info, mode parser.Mode) (*Package, error) {
31 fset := token.NewFileSet()
32 f, err := parser.ParseFile(fset, path, source, mode)
36 conf := Config{Importer: importer.Default()}
37 return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
40 func mustTypecheck(t testing.TB, path, source string, info *Info) string {
41 pkg, err := pkgFor(path, source, info)
45 name = "package " + pkg.Name()
47 t.Fatalf("%s: didn't type-check (%s)", name, err)
52 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
53 fset := token.NewFileSet()
54 f, err := parser.ParseFile(fset, path, source, 0)
55 if f == nil { // ignore errors unless f is nil
56 t.Fatalf("%s: unable to parse: %s", path, err)
59 Error: func(err error) {},
60 Importer: importer.Default(),
62 pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
63 return pkg.Name(), err
66 func TestValuesInfo(t *testing.T) {
67 var tests = []struct {
69 expr string // constant expression
70 typ string // constant type
71 val string // constant value
73 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
74 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
75 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
76 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
77 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
78 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
80 {`package b0; var _ = false`, `false`, `bool`, `false`},
81 {`package b1; var _ = 0`, `0`, `int`, `0`},
82 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
83 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
84 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
85 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
87 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
88 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
89 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
91 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
92 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
93 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
95 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
96 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
97 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
99 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
100 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
101 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
103 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
104 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
105 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
107 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
108 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
109 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
110 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
111 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
112 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
114 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
115 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
116 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
117 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
119 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
120 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
121 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
122 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
123 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
124 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
125 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
126 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
128 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
129 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
130 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
131 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
132 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
133 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
134 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
135 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
136 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
139 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
141 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
142 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
145 for _, test := range tests {
147 Types: make(map[ast.Expr]TypeAndValue),
149 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
151 // look for expression
153 for e := range info.Types {
154 if ExprString(e) == test.expr {
160 t.Errorf("package %s: no expression found for %s", name, test.expr)
163 tv := info.Types[expr]
165 // check that type is correct
166 if got := tv.Type.String(); got != test.typ {
167 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
171 // if we have a constant, check that value is correct
173 if got := tv.Value.ExactString(); got != test.val {
174 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
178 t.Errorf("package %s: no constant found; want %s", name, test.val)
184 func TestTypesInfo(t *testing.T) {
185 // Test sources that are not expected to typecheck must start with the broken prefix.
186 const broken = "package broken_"
188 var tests = []struct {
190 expr string // expression
191 typ string // value type
193 // single-valued expressions of untyped constants
194 {`package b0; var x interface{} = false`, `false`, `bool`},
195 {`package b1; var x interface{} = 0`, `0`, `int`},
196 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
197 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
198 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
201 {`package n0; var _ *int = nil`, `nil`, `untyped nil`},
202 {`package n1; var _ func() = nil`, `nil`, `untyped nil`},
203 {`package n2; var _ []byte = nil`, `nil`, `untyped nil`},
204 {`package n3; var _ map[int]int = nil`, `nil`, `untyped nil`},
205 {`package n4; var _ chan int = nil`, `nil`, `untyped nil`},
206 {`package n5; var _ interface{} = nil`, `nil`, `untyped nil`},
207 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `untyped nil`},
209 {`package n10; var (x *int; _ = x == nil)`, `nil`, `untyped nil`},
210 {`package n11; var (x func(); _ = x == nil)`, `nil`, `untyped nil`},
211 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `untyped nil`},
212 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `untyped nil`},
213 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `untyped nil`},
214 {`package n15; var (x interface{}; _ = x == nil)`, `nil`, `untyped nil`},
215 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `untyped nil`},
217 {`package n20; var _ = (*int)(nil)`, `nil`, `untyped nil`},
218 {`package n21; var _ = (func())(nil)`, `nil`, `untyped nil`},
219 {`package n22; var _ = ([]byte)(nil)`, `nil`, `untyped nil`},
220 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `untyped nil`},
221 {`package n24; var _ = (chan int)(nil)`, `nil`, `untyped nil`},
222 {`package n25; var _ = (interface{})(nil)`, `nil`, `untyped nil`},
223 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `untyped nil`},
225 {`package n30; func f(*int) { f(nil) }`, `nil`, `untyped nil`},
226 {`package n31; func f(func()) { f(nil) }`, `nil`, `untyped nil`},
227 {`package n32; func f([]byte) { f(nil) }`, `nil`, `untyped nil`},
228 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `untyped nil`},
229 {`package n34; func f(chan int) { f(nil) }`, `nil`, `untyped nil`},
230 {`package n35; func f(interface{}) { f(nil) }`, `nil`, `untyped nil`},
231 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `untyped nil`},
233 // comma-ok expressions
234 {`package p0; var x interface{}; var _, _ = x.(int)`,
238 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
242 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
244 `(complex128, p2a.mybool)`,
246 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
248 `(complex128, bool)`,
250 {`package p3; var c chan string; var _, _ = <-c`,
256 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
260 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
264 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
268 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
272 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
278 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
282 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
286 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
290 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
294 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
298 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
304 {`package issue28277_a; func f(...int)`,
308 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
314 {`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`},
315 {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `untyped float`},
316 {`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`},
317 {`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`},
318 {`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`},
319 {`package issue47243_f; var x int32; var _ = 1 << 2`, `2`, `untyped int`},
320 {`package issue47243_g; var x int32; var _ = int(1) << 2`, `2`, `untyped int`},
321 {`package issue47243_h; var x int32; var _ = 1 << (2 << x)`, `1`, `int`},
322 {`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`},
323 {`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`},
325 // tests for broken code that doesn't parse or type-check
326 {broken + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
327 {broken + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
328 {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a; f: b;}}`, `b`, `string`},
329 {broken + `x3; var x = panic("");`, `panic`, `func(interface{})`},
330 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
331 {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
333 // parameterized functions
334 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
335 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
336 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
337 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
338 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
339 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
342 {`package t0; type t[] int; var _ t`, `t`, `t0.t`}, // t[] is a syntax error that is ignored in this test in favor of t
343 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
344 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
345 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
346 {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
348 // instantiated types must be sanitized
349 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
352 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
355 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
358 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
359 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
360 {`package u2a; func _[_ interface{int | string}]() {}`, `int | string`, `int | string`},
361 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string | ~bool`, `int | string | ~bool`},
362 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string`, `int | string`},
363 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `~bool`, `~bool`},
364 {`package u3a; func _[_ interface{int | string | ~float64|~bool}]() {}`, `int | string | ~float64`, `int | string | ~float64`},
366 {`package u0b; func _[_ int]() {}`, `int`, `int`},
367 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
368 {`package u2b; func _[_ int | string]() {}`, `int | string`, `int | string`},
369 {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string | ~bool`, `int | string | ~bool`},
370 {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string`, `int | string`},
371 {`package u3b; func _[_ int | string | ~bool]() {}`, `~bool`, `~bool`},
372 {`package u3b; func _[_ int | string | ~float64|~bool]() {}`, `int | string | ~float64`, `int | string | ~float64`},
374 {`package u0c; type _ interface{int}`, `int`, `int`},
375 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
376 {`package u2c; type _ interface{int | string}`, `int | string`, `int | string`},
377 {`package u3c; type _ interface{int | string | ~bool}`, `int | string | ~bool`, `int | string | ~bool`},
378 {`package u3c; type _ interface{int | string | ~bool}`, `int | string`, `int | string`},
379 {`package u3c; type _ interface{int | string | ~bool}`, `~bool`, `~bool`},
380 {`package u3c; type _ interface{int | string | ~float64|~bool}`, `int | string | ~float64`, `int | string | ~float64`},
383 for _, test := range tests {
384 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
386 if strings.HasPrefix(test.src, broken) {
388 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
390 t.Errorf("package %s: expected to fail but passed", name)
394 name = mustTypecheck(t, "TypesInfo", test.src, &info)
397 // look for expression type
399 for e, tv := range info.Types {
400 if ExprString(e) == test.expr {
406 t.Errorf("package %s: no type found for %s", name, test.expr)
410 // check that type is correct
411 if got := typ.String(); got != test.typ {
412 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
417 func TestInstanceInfo(t *testing.T) {
418 const lib = `package lib
425 type testInst struct {
431 var tests = []struct {
433 instances []testInst // recorded instances in source order
435 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
436 []testInst{{`f`, []string{`int`}, `func(int)`}},
438 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
439 []testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
441 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
442 []testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
444 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
445 []testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
447 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
448 []testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
451 {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
452 []testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
454 {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
455 []testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
457 {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
459 {`C`, []string{`T`}, `interface{chan<- T}`},
460 {`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
463 {`package s4; type C[T any] interface{chan<- T}; func f[T any, P C[T], Q C[[]*P]](x []T) {}; func _(x []int) { f(x) }`,
465 {`C`, []string{`T`}, `interface{chan<- T}`},
466 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
467 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
471 {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
472 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
474 {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
475 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
477 {`package t3; type C[T any] interface{chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
479 {`C`, []string{`T`}, `interface{chan<- T}`},
480 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
481 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
484 {`package t4; type C[T any] interface{chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = (f[int]) }`,
486 {`C`, []string{`T`}, `interface{chan<- T}`},
487 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
488 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
491 {`package i0; import "lib"; func _() { lib.F(42) }`,
492 []testInst{{`F`, []string{`int`}, `func(int)`}},
495 {`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
497 {`f`, []string{`int`}, `func(int)`},
498 {`f`, []string{`string`}, `func(string)`},
499 {`f`, []string{`int`}, `func(int)`},
502 {`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
504 {`F`, []string{`int`}, `func(int)`},
505 {`F`, []string{`string`}, `func(string)`},
506 {`F`, []string{`int`}, `func(int)`},
510 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
511 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
513 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
514 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
516 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
517 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
519 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
520 []testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
522 {`package type4; import "lib"; var _ lib.T[int]`,
523 []testInst{{`T`, []string{`int`}, `[]int`}},
526 {`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
528 {`T`, []string{`int`}, `struct{x int}`},
529 {`T`, []string{`int`}, `struct{x int}`},
532 {`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
534 {`T`, []string{`Q`}, `struct{x Q}`},
535 {`T`, []string{`Q`}, `struct{x Q}`},
538 {`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
540 {`T`, []string{`int`}, `[]int`},
541 {`T`, []string{`int`}, `[]int`},
542 {`T`, []string{`string`}, `[]string`},
547 for _, test := range tests {
548 imports := make(testImporter)
549 conf := Config{Importer: imports}
550 instMap := make(map[*ast.Ident]Instance)
551 useMap := make(map[*ast.Ident]Object)
552 makePkg := func(src string) *Package {
553 f, err := parser.ParseFile(fset, "p.go", src, 0)
557 pkg, err := conf.Check("", fset, []*ast.File{f}, &Info{Instances: instMap, Uses: useMap})
561 imports[pkg.Name()] = pkg
565 pkg := makePkg(test.src)
567 t.Run(pkg.Name(), func(t *testing.T) {
568 // Sort instances in source order for stability.
569 instances := sortedInstances(instMap)
570 if got, want := len(instances), len(test.instances); got != want {
571 t.Fatalf("got %d instances, want %d", got, want)
574 // Pairwise compare with the expected instances.
575 for ii, inst := range instances {
577 for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
578 targs = append(targs, inst.Inst.TypeArgs.At(i))
580 typ := inst.Inst.Type
582 testInst := test.instances[ii]
583 if got := inst.Ident.Name; got != testInst.name {
584 t.Fatalf("got name %s, want %s", got, testInst.name)
586 if len(targs) != len(testInst.targs) {
587 t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
589 for i, targ := range targs {
590 if got := targ.String(); got != testInst.targs[i] {
591 t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
594 if got := typ.Underlying().String(); got != testInst.typ {
595 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
598 // Verify the invariant that re-instantiating the corresponding generic
599 // type with TypeArgs results in an identical instance.
600 ptype := useMap[inst.Ident].Type()
601 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
602 if lister == nil || lister.TypeParams().Len() == 0 {
603 t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Ident, ptype)
605 inst2, err := Instantiate(nil, ptype, targs, true)
607 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
609 if !Identical(inst.Inst.Type, inst2) {
610 t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
617 type recordedInstance struct {
622 func sortedInstances(m map[*ast.Ident]Instance) (instances []recordedInstance) {
623 for id, inst := range m {
624 instances = append(instances, recordedInstance{id, inst})
626 sort.Slice(instances, func(i, j int) bool {
627 return instances[i].Ident.Pos() < instances[j].Ident.Pos()
632 func TestDefsInfo(t *testing.T) {
633 var tests = []struct {
638 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
639 {`package p1; const x int = 42`, `x`, `const p1.x int`},
640 {`package p2; var x int`, `x`, `var p2.x int`},
641 {`package p3; type x int`, `x`, `type p3.x int`},
642 {`package p4; func f()`, `f`, `func p4.f()`},
643 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
645 // Tests using generics.
646 {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
647 {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
648 {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
651 for _, test := range tests {
653 Defs: make(map[*ast.Ident]Object),
655 name := mustTypecheck(t, "DefsInfo", test.src, &info)
659 for id, obj := range info.Defs {
660 if id.Name == test.obj {
666 t.Errorf("package %s: %s not found", name, test.obj)
670 if got := def.String(); got != test.want {
671 t.Errorf("package %s: got %s; want %s", name, got, test.want)
676 func TestUsesInfo(t *testing.T) {
677 var tests = []struct {
682 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
683 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
684 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
685 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
686 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
688 // Tests using generics.
689 {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
690 {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
691 {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
692 {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
694 // Uses of fields are instantiated.
695 {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
696 {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
698 // Uses of methods are uses of the instantiated method.
699 {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
700 {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
701 {`package m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
702 {`package m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
703 {`package m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
704 {`package m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m5.T[B]).m() B`},
705 {`package m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m6.T[B]).m()`},
706 {`package m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (m7.T[int]).m() int`},
707 {`package m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (m8.T[int]).m()`},
708 {`package m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (m9.T[int]).m()`},
710 `package m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
712 `func (m10.E[int]).m()`,
714 {`package m11; type T[A any] interface{ m(); n() }; func _(t1 T[int], t2 T[string]) { t1.m(); t2.n() }`, `m`, `func (m11.T[int]).m()`},
715 {`package m12; type T[A any] interface{ m(); n() }; func _(t1 T[int], t2 T[string]) { t1.m(); t2.n() }`, `n`, `func (m12.T[string]).n()`},
718 for _, test := range tests {
720 Uses: make(map[*ast.Ident]Object),
722 name := mustTypecheck(t, "UsesInfo", test.src, &info)
726 for id, obj := range info.Uses {
727 if id.Name == test.obj {
729 panic(fmt.Sprintf("multiple uses of %q", id.Name))
735 t.Errorf("package %s: %s not found", name, test.obj)
739 if got := use.String(); got != test.want {
740 t.Errorf("package %s: got %s; want %s", name, got, test.want)
745 func TestGenericMethodInfo(t *testing.T) {
750 func (r N[B]) m() { r.m(); r.n() }
752 func (r *N[C]) n() { }
754 fset := token.NewFileSet()
755 f, err := parser.ParseFile(fset, "p.go", src, 0)
760 Defs: make(map[*ast.Ident]Object),
761 Uses: make(map[*ast.Ident]Object),
762 Selections: make(map[*ast.SelectorExpr]*Selection),
765 pkg, err := conf.Check("p", fset, []*ast.File{f}, &info)
770 N := pkg.Scope().Lookup("N").Type().(*Named)
772 // Find the generic methods stored on N.
773 gm, gn := N.Method(0), N.Method(1)
774 if gm.Name() == "n" {
778 // Collect objects from info.
779 var dm, dn *Func // the declared methods
780 var dmm, dmn *Func // the methods used in the body of m
781 for _, decl := range f.Decls {
782 fdecl, ok := decl.(*ast.FuncDecl)
786 def := info.Defs[fdecl.Name].(*Func)
787 switch fdecl.Name.Name {
790 ast.Inspect(fdecl.Body, func(n ast.Node) bool {
791 if call, ok := n.(*ast.CallExpr); ok {
792 sel := call.Fun.(*ast.SelectorExpr)
793 use := info.Uses[sel.Sel].(*Func)
794 selection := info.Selections[sel]
795 if selection.Kind() != MethodVal {
796 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
798 if selection.Obj() != use {
799 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
801 switch sel.Sel.Name {
816 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
819 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
822 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
825 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
829 func TestImplicitsInfo(t *testing.T) {
830 testenv.MustHaveGoBuild(t)
832 var tests = []struct {
836 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
837 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
838 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
840 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
841 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
842 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
843 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
845 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
846 {`package p8; func f(int) {}`, "field: var int"},
847 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
848 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
850 // Tests using generics.
851 {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
852 {`package f1; func f[T any](int) {}`, "field: var int"},
853 {`package f2; func f[T any](T) {}`, "field: var T"},
854 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
855 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
856 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
857 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
858 {`package t2; type T[A any] struct{}; func _[P any](x interface{}) { switch t := x.(type) { case T[P]: _ = t } }`, "caseClause: var t t2.T[P]"},
859 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
862 for _, test := range tests {
864 Implicits: make(map[ast.Node]Object),
866 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
868 // the test cases expect at most one Implicits entry
869 if len(info.Implicits) > 1 {
870 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
874 // extract Implicits entry, if any
876 for n, obj := range info.Implicits {
877 switch x := n.(type) {
878 case *ast.ImportSpec:
880 case *ast.CaseClause:
885 t.Fatalf("package %s: unexpected %T", name, x)
887 got += ": " + obj.String()
891 if got != test.want {
892 t.Errorf("package %s: got %q; want %q", name, got, test.want)
897 func predString(tv TypeAndValue) string {
898 var buf strings.Builder
899 pred := func(b bool, s string) {
902 buf.WriteString(", ")
908 pred(tv.IsVoid(), "void")
909 pred(tv.IsType(), "type")
910 pred(tv.IsBuiltin(), "builtin")
911 pred(tv.IsValue() && tv.Value != nil, "const")
912 pred(tv.IsValue() && tv.Value == nil, "value")
913 pred(tv.IsNil(), "nil")
914 pred(tv.Addressable(), "addressable")
915 pred(tv.Assignable(), "assignable")
916 pred(tv.HasOk(), "hasOk")
924 func TestPredicatesInfo(t *testing.T) {
925 testenv.MustHaveGoBuild(t)
927 var tests = []struct {
933 {`package n0; func f() { f() }`, `f()`, `void`},
936 {`package t0; type _ int`, `int`, `type`},
937 {`package t1; type _ []int`, `[]int`, `type`},
938 {`package t2; type _ func()`, `func()`, `type`},
939 {`package t3; type _ func(int)`, `int`, `type`},
940 {`package t3; type _ func(...int)`, `...int`, `type`},
943 {`package b0; var _ = len("")`, `len`, `builtin`},
944 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
947 {`package c0; var _ = 42`, `42`, `const`},
948 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
949 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
952 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
953 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
954 {`package v2; var _ = func(){}`, `(func() literal)`, `value`},
955 {`package v4; func f() { _ = f }`, `f`, `value`},
956 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
957 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
959 // addressable (and thus assignable) operands
960 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
961 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
962 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
963 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
964 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
965 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
966 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
967 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
968 // composite literals are not addressable
970 // assignable but not addressable values
971 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
972 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
975 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
976 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
979 // - package names are collected in the Uses map
980 // - identifiers being declared are collected in the Defs map
981 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
982 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
983 {`package m2; const c = 0`, `c`, `<missing>`},
984 {`package m3; type T int`, `T`, `<missing>`},
985 {`package m4; var v int`, `v`, `<missing>`},
986 {`package m5; func f() {}`, `f`, `<missing>`},
987 {`package m6; func _(x int) {}`, `x`, `<missing>`},
988 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
989 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
992 for _, test := range tests {
993 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
994 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
996 // look for expression predicates
998 for e, tv := range info.Types {
999 //println(name, ExprString(e))
1000 if ExprString(e) == test.expr {
1001 got = predString(tv)
1006 if got != test.pred {
1007 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
1012 func TestScopesInfo(t *testing.T) {
1013 testenv.MustHaveGoBuild(t)
1015 var tests = []struct {
1017 scopes []string // list of scope descriptors of the form kind:varlist
1019 {`package p0`, []string{
1022 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1025 {`package p2; func _() {}`, []string{
1028 {`package p3; func _(x, y int) {}`, []string{
1029 "file:", "func:x y",
1031 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1032 "file:", "func:x y z", // redeclaration of x
1034 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1035 "file:", "func:u x y",
1037 {`package p6; func _() { { var x int; _ = x } }`, []string{
1038 "file:", "func:", "block:x",
1040 {`package p7; func _() { if true {} }`, []string{
1041 "file:", "func:", "if:", "block:",
1043 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1044 "file:", "func:", "if:x", "block:y",
1046 {`package p9; func _() { switch x := 0; x {} }`, []string{
1047 "file:", "func:", "switch:x",
1049 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1050 "file:", "func:", "switch:x", "case:y", "case:",
1052 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1053 "file:", "func:t", "type switch:",
1055 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1056 "file:", "func:t", "type switch:t",
1058 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1059 "file:", "func:t", "type switch:", "case:x", // x implicitly declared
1061 {`package p14; func _() { select{} }`, []string{
1064 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1065 "file:", "func:c", "comm:",
1067 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1068 "file:", "func:c", "comm:i x",
1070 {`package p17; func _() { for{} }`, []string{
1071 "file:", "func:", "for:", "block:",
1073 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1074 "file:", "func:n", "for:i", "block:",
1076 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1077 "file:", "func:a", "range:i", "block:",
1079 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1080 "file:", "func:a", "range:i x", "block:",
1084 for _, test := range tests {
1085 info := Info{Scopes: make(map[ast.Node]*Scope)}
1086 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
1088 // number of scopes must match
1089 if len(info.Scopes) != len(test.scopes) {
1090 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1093 // scope descriptions must match
1094 for node, scope := range info.Scopes {
1095 kind := "<unknown node kind>"
1096 switch node.(type) {
1101 case *ast.BlockStmt:
1105 case *ast.SwitchStmt:
1107 case *ast.TypeSwitchStmt:
1108 kind = "type switch"
1109 case *ast.CaseClause:
1111 case *ast.CommClause:
1115 case *ast.RangeStmt:
1119 // look for matching scope description
1120 desc := kind + ":" + strings.Join(scope.Names(), " ")
1122 for _, d := range test.scopes {
1129 t.Errorf("package %s: no matching scope found for %s", name, desc)
1135 func TestInitOrderInfo(t *testing.T) {
1136 var tests = []struct {
1140 {`package p0; var (x = 1; y = x)`, []string{
1143 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1144 "a = 1", "b = 2", "c = 3",
1146 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1147 "a = 1", "b = 2", "c = 3",
1149 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1150 "_ = f()", // blank var
1152 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1153 "a = 0", "z = 0", "y = z", "x = y",
1155 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1156 "a, _ = m[0]", // blank var
1158 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1159 "z = 0", "a, b = f()",
1161 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1162 "b = 1", "a = (func() int literal)()",
1164 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1165 "c = 1", "a, b = (func() (_, _ int) literal)()",
1167 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1170 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1171 "a = 0", "b = 0", "c = 0", "d = c + b",
1173 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1174 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1176 // emit an initializer for n:1 initializations only once (not for each node
1177 // on the lhs which may appear in different order in the dependency graph)
1178 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1179 "b = 0", "x, y = m[0]", "a = x",
1181 // test case from spec section on package initialization
1195 "d = 3", "b = f()", "c = f()", "a = c + b",
1197 // test case for issue 7131
1201 func next() int { counter++; return counter }
1204 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1207 var b, c = next(), next()
1208 var d, e, f = next(), next(), next()
1210 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1212 // test case for issue 10709
1222 func (T) m() int { return 0 }
1224 func makeT(n int) T {
1230 "t = makeT(0)", "v = t.m()",
1232 // test case for issue 10709: same as test before, but variable decls swapped
1242 func (T) m() int { return 0 }
1244 func makeT(n int) T {
1250 "t = makeT(0)", "v = t.m()",
1252 // another candidate possibly causing problems with issue 10709
1257 func f1() int { return g1() }
1258 func g1() int { f1(); return x1 }
1264 func f2() int { return g2() }
1265 func g2() int { return x2 }
1267 var x2 = 0`, []string{
1268 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1272 for _, test := range tests {
1274 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1276 // number of initializers must match
1277 if len(info.InitOrder) != len(test.inits) {
1278 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1282 // initializers must match
1283 for i, want := range test.inits {
1284 got := info.InitOrder[i].String()
1286 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1293 func TestMultiFileInitOrder(t *testing.T) {
1294 fset := token.NewFileSet()
1295 mustParse := func(src string) *ast.File {
1296 f, err := parser.ParseFile(fset, "main", src, 0)
1303 fileA := mustParse(`package main; var a = 1`)
1304 fileB := mustParse(`package main; var b = 2`)
1306 // The initialization order must not depend on the parse
1307 // order of the files, only on the presentation order to
1308 // the type-checker.
1309 for _, test := range []struct {
1313 {[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"},
1314 {[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"},
1317 if _, err := new(Config).Check("main", fset, test.files, &info); err != nil {
1320 if got := fmt.Sprint(info.InitOrder); got != test.want {
1321 t.Fatalf("got %s; want %s", got, test.want)
1326 func TestFiles(t *testing.T) {
1327 var sources = []string{
1328 "package p; type T struct{}; func (T) m1() {}",
1329 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1330 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1335 fset := token.NewFileSet()
1336 pkg := NewPackage("p", "p")
1338 check := NewChecker(&conf, fset, pkg, &info)
1340 for i, src := range sources {
1341 filename := fmt.Sprintf("sources%d", i)
1342 f, err := parser.ParseFile(fset, filename, src, 0)
1346 if err := check.Files([]*ast.File{f}); err != nil {
1351 // check InitOrder is [x y]
1353 for _, init := range info.InitOrder {
1354 for _, v := range init.Lhs {
1355 vars = append(vars, v.Name())
1358 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1359 t.Errorf("InitOrder == %s, want %s", got, want)
1363 type testImporter map[string]*Package
1365 func (m testImporter) Import(path string) (*Package, error) {
1366 if pkg := m[path]; pkg != nil {
1369 return nil, fmt.Errorf("package %q not found", path)
1372 func TestSelection(t *testing.T) {
1373 selections := make(map[*ast.SelectorExpr]*Selection)
1375 fset := token.NewFileSet()
1376 imports := make(testImporter)
1377 conf := Config{Importer: imports}
1378 makePkg := func(path, src string) {
1379 f, err := parser.ParseFile(fset, path+".go", src, 0)
1383 pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
1417 type G[P any] struct {
1429 // qualified identifiers
1467 // method expressions
1475 wantOut := map[string][2]string{
1476 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1478 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1479 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1480 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1481 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1482 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1483 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1484 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1485 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1486 "Inst.p": {"field (main.G[int]) p int", ".[0]"},
1488 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1489 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1490 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1491 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1492 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1493 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1494 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1495 "C{}.g": {"method (main.C) g()", ".[0]"},
1496 "new(C).g": {"method (*main.C) g()", "->[0]"},
1497 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1498 "Inst.m": {"method (main.G[int]) m(int)", ".[0]"},
1500 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1501 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1502 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1503 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1504 "G[string].m": {"method expr (main.G[string]) m(main.G[string], string)", ".[0]"},
1505 "G[string]{}.p": {"field (main.G[string]) p string", ".[0]"},
1508 makePkg("lib", libSrc)
1509 makePkg("main", mainSrc)
1511 for e, sel := range selections {
1512 _ = sel.String() // assertion: must not panic
1514 start := fset.Position(e.Pos()).Offset
1515 end := fset.Position(e.End()).Offset
1516 syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1524 fmt.Sprintf("%s%v", direct, sel.Index()),
1526 want := wantOut[syntax]
1528 t.Errorf("%s: got %q; want %q", syntax, got, want)
1530 delete(wantOut, syntax)
1532 // We must explicitly assert properties of the
1533 // Signature's receiver since it doesn't participate
1534 // in Identical() or String().
1535 sig, _ := sel.Type().(*Signature)
1536 if sel.Kind() == MethodVal {
1537 got := sig.Recv().Type()
1539 if !Identical(got, want) {
1540 t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
1542 } else if sig != nil && sig.Recv() != nil {
1543 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1546 // Assert that all wantOut entries were used exactly once.
1547 for syntax := range wantOut {
1548 t.Errorf("no ast.Selection found with syntax %q", syntax)
1552 func TestIssue8518(t *testing.T) {
1553 fset := token.NewFileSet()
1554 imports := make(testImporter)
1556 Error: func(err error) { t.Log(err) }, // don't exit after first error
1559 makePkg := func(path, src string) {
1560 f, err := parser.ParseFile(fset, path, src, 0)
1564 pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
1572 const C2 = missing.C
1582 makePkg("a", libSrc)
1583 makePkg("main", mainSrc) // don't crash when type-checking this package
1586 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1587 // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
1589 const want = "LookupFieldOrMethod on nil type"
1591 if s, ok := p.(string); !ok || s != want {
1592 t.Fatalf("got %v, want %s", p, want)
1595 LookupFieldOrMethod(nil, false, nil, "")
1598 func TestLookupFieldOrMethod(t *testing.T) {
1599 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1600 // addressable value, and x for a non-addressable value (even though a variable
1601 // for ease of test case writing).
1603 // Should be kept in sync with TestMethodSet.
1604 var tests = []struct {
1611 {"var x T; type T struct{}", false, nil, false},
1612 {"var x T; type T struct{ f int }", true, []int{0}, false},
1613 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1615 // field lookups on a generic type
1616 {"var x T[int]; type T[P any] struct{}", false, nil, false},
1617 {"var x T[int]; type T[P any] struct{ f P }", true, []int{0}, false},
1618 {"var x T[int]; type T[P any] struct{ a, b, f, c P }", true, []int{2}, false},
1621 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1622 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1623 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1624 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1626 // method lookups on a generic type
1627 {"var a T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, false},
1628 {"var a *T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, true},
1629 {"var a T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, false},
1630 {"var a *T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1633 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1634 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1636 // collisions on a generic type
1637 {"type ( E1[P any] struct{ f P }; E2[P any] struct{ f P }; x struct{ E1[int]; *E2[int] })", false, []int{1, 0}, false},
1638 {"type ( E1[P any] struct{ f P }; E2[P any] struct{}; x struct{ E1[int]; *E2[int] }); func (E2[P]) f() {}", false, []int{1, 0}, false},
1640 // outside methodset
1641 // (*T).f method exists, but value of type T is not addressable
1642 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1644 // outside method set of a generic type
1645 {"var x T[int]; type T[P any] struct{}; func (*T[P]) f() {}", false, nil, true},
1647 // recursive generic types; see golang/go#52715
1648 {"var a T[int]; type ( T[P any] struct { *N[P] }; N[P any] struct { *T[P] } ); func (N[P]) f() {}", true, []int{0, 0}, true},
1649 {"var a T[int]; type ( T[P any] struct { *N[P] }; N[P any] struct { *T[P] } ); func (T[P]) f() {}", true, []int{0}, false},
1652 for _, test := range tests {
1653 pkg, err := pkgForMode("test", "package p;"+test.src, nil, 0)
1655 t.Errorf("%s: incorrect test case: %s", test.src, err)
1659 obj := pkg.Scope().Lookup("a")
1661 if obj = pkg.Scope().Lookup("x"); obj == nil {
1662 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1667 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1668 if (f != nil) != test.found {
1670 t.Errorf("%s: got no object; want one", test.src)
1672 t.Errorf("%s: got object = %v; want none", test.src, f)
1675 if !sameSlice(index, test.index) {
1676 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1678 if indirect != test.indirect {
1679 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1684 // Test for golang/go#52715
1685 func TestLookupFieldOrMethod_RecursiveGeneric(t *testing.T) {
1689 type Tree[T any] struct {
1693 func (*Tree[R]) N(r R) R { return r }
1695 type Node[T any] struct {
1699 type Instance = *Tree[int]
1702 fset := token.NewFileSet()
1703 f, err := parser.ParseFile(fset, "foo.go", src, 0)
1707 pkg := NewPackage("pkg", f.Name.Name)
1708 if err := NewChecker(nil, fset, pkg, nil).Files([]*ast.File{f}); err != nil {
1712 T := pkg.Scope().Lookup("Instance").Type()
1713 _, _, _ = LookupFieldOrMethod(T, false, pkg, "M") // verify that LookupFieldOrMethod terminates
1716 func sameSlice(a, b []int) bool {
1717 if len(a) != len(b) {
1720 for i, x := range a {
1728 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1729 // the correct result at various positions with the source.
1730 func TestScopeLookupParent(t *testing.T) {
1731 fset := token.NewFileSet()
1732 imports := make(testImporter)
1733 conf := Config{Importer: imports}
1734 mustParse := func(src string) *ast.File {
1735 f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments)
1742 makePkg := func(path string, files ...*ast.File) {
1744 imports[path], err = conf.Check(path, fset, files, &info)
1750 makePkg("lib", mustParse("package lib; var X int"))
1751 // Each /*name=kind:line*/ comment makes the test look up the
1752 // name at that point and checks that it resolves to a decl of
1753 // the specified kind and line number. "undef" means undefined.
1755 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1766 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1767 type /*t=undef*/ t /*t=typename:14*/ *t
1768 print(Y) /*Y=var:10*/
1769 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1770 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1773 for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
1776 switch y := i.(type) { /*y=undef*/
1777 case /*y=undef*/ int /*y=var:23*/ :
1778 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1779 default /*y=var:23*/:
1784 switch int := i.(type) {
1785 case /*int=typename:0*/ int /*int=var:31*/ :
1787 default /*int=var:31*/ :
1793 info.Uses = make(map[*ast.Ident]Object)
1794 f := mustParse(mainSrc)
1796 mainScope := imports["main"].Scope()
1797 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1798 for _, group := range f.Comments {
1799 for _, comment := range group.List {
1800 // Parse the assertion in the comment.
1801 m := rx.FindStringSubmatch(comment.Text)
1803 t.Errorf("%s: bad comment: %s",
1804 fset.Position(comment.Pos()), comment.Text)
1807 name, want := m[1], m[2]
1809 // Look up the name in the innermost enclosing scope.
1810 inner := mainScope.Innermost(comment.Pos())
1812 t.Errorf("%s: at %s: can't find innermost scope",
1813 fset.Position(comment.Pos()), comment.Text)
1817 if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil {
1818 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
1819 got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line)
1822 t.Errorf("%s: at %s: %s resolved to %s, want %s",
1823 fset.Position(comment.Pos()), comment.Text, name, got, want)
1828 // Check that for each referring identifier,
1829 // a lookup of its name on the innermost
1830 // enclosing scope returns the correct object.
1832 for id, wantObj := range info.Uses {
1833 inner := mainScope.Innermost(id.Pos())
1835 t.Errorf("%s: can't find innermost scope enclosing %q",
1836 fset.Position(id.Pos()), id.Name)
1840 // Exclude selectors and qualified identifiers---lexical
1841 // refs only. (Ideally, we'd see if the AST parent is a
1842 // SelectorExpr, but that requires PathEnclosingInterval
1843 // from golang.org/x/tools/go/ast/astutil.)
1848 _, gotObj := inner.LookupParent(id.Name, id.Pos())
1849 if gotObj != wantObj {
1850 t.Errorf("%s: got %v, want %v",
1851 fset.Position(id.Pos()), gotObj, wantObj)
1857 // newDefined creates a new defined type named T with the given underlying type.
1858 // Helper function for use with TestIncompleteInterfaces only.
1859 func newDefined(underlying Type) *Named {
1860 tname := NewTypeName(token.NoPos, nil, "T", nil)
1861 return NewNamed(tname, underlying, nil)
1864 func TestConvertibleTo(t *testing.T) {
1865 for _, test := range []struct {
1869 {Typ[Int], Typ[Int], true},
1870 {Typ[Int], Typ[Float32], true},
1871 {Typ[Int], Typ[String], true},
1872 {newDefined(Typ[Int]), Typ[Int], true},
1873 {newDefined(new(Struct)), new(Struct), true},
1874 {newDefined(Typ[Int]), new(Struct), false},
1875 {Typ[UntypedInt], Typ[Int], true},
1876 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1877 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1878 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1879 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1880 {Typ[UntypedString], Typ[String], true},
1882 if got := ConvertibleTo(test.v, test.t); got != test.want {
1883 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1888 func TestAssignableTo(t *testing.T) {
1889 for _, test := range []struct {
1893 {Typ[Int], Typ[Int], true},
1894 {Typ[Int], Typ[Float32], false},
1895 {newDefined(Typ[Int]), Typ[Int], false},
1896 {newDefined(new(Struct)), new(Struct), true},
1897 {Typ[UntypedBool], Typ[Bool], true},
1898 {Typ[UntypedString], Typ[Bool], false},
1899 // Neither untyped string nor untyped numeric assignments arise during
1900 // normal type checking, so the below behavior is technically undefined by
1902 {Typ[UntypedString], Typ[String], true},
1903 {Typ[UntypedInt], Typ[Int], true},
1905 if got := AssignableTo(test.v, test.t); got != test.want {
1906 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1911 func TestIdentical(t *testing.T) {
1912 // For each test, we compare the types of objects X and Y in the source.
1918 {"var X int; var Y int", true},
1919 {"var X int; var Y string", false},
1921 // TODO: add more tests for complex types.
1924 {"type X int; type Y int", false},
1927 {"type X = int; type Y = int", true},
1930 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1931 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1932 {`func X(int) string { return "" }; func Y(int) {}`, false},
1934 // Generic functions. Type parameters should be considered identical modulo
1935 // renaming. See also issue #49722.
1936 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1937 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1938 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1939 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1940 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1941 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1944 for _, test := range tests {
1945 pkg, err := pkgForMode("test", "package p;"+test.src, nil, 0)
1947 t.Errorf("%s: incorrect test case: %s", test.src, err)
1950 X := pkg.Scope().Lookup("X")
1951 Y := pkg.Scope().Lookup("Y")
1952 if X == nil || Y == nil {
1953 t.Fatal("test must declare both X and Y")
1955 if got := Identical(X.Type(), Y.Type()); got != test.want {
1956 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1961 func TestIdentical_issue15173(t *testing.T) {
1962 // Identical should allow nil arguments and be symmetric.
1963 for _, test := range []struct {
1967 {Typ[Int], Typ[Int], true},
1968 {Typ[Int], nil, false},
1969 {nil, Typ[Int], false},
1972 if got := Identical(test.x, test.y); got != test.want {
1973 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1978 func TestIdenticalUnions(t *testing.T) {
1979 tname := NewTypeName(token.NoPos, nil, "myInt", nil)
1980 myInt := NewNamed(tname, Typ[Int], nil)
1981 tmap := map[string]*Term{
1982 "int": NewTerm(false, Typ[Int]),
1983 "~int": NewTerm(true, Typ[Int]),
1984 "string": NewTerm(false, Typ[String]),
1985 "~string": NewTerm(true, Typ[String]),
1986 "myInt": NewTerm(false, myInt),
1988 makeUnion := func(s string) *Union {
1989 parts := strings.Split(s, "|")
1991 for _, p := range parts {
1994 t.Fatalf("missing term %q", p)
1996 terms = append(terms, term)
1998 return NewUnion(terms)
2000 for _, test := range []struct {
2004 // These tests are just sanity checks. The tests for type sets and
2005 // interfaces provide much more test coverage.
2006 {"int|~int", "~int", true},
2007 {"myInt|~int", "~int", true},
2008 {"int|string", "string|int", true},
2009 {"int|int|string", "string|int", true},
2010 {"myInt|string", "int|string", false},
2012 x := makeUnion(test.x)
2013 y := makeUnion(test.y)
2014 if got := Identical(x, y); got != test.want {
2015 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
2020 func TestIssue15305(t *testing.T) {
2021 const src = "package p; func f() int16; var _ = f(undef)"
2022 fset := token.NewFileSet()
2023 f, err := parser.ParseFile(fset, "issue15305.go", src, 0)
2028 Error: func(err error) {}, // allow errors
2031 Types: make(map[ast.Expr]TypeAndValue),
2033 conf.Check("p", fset, []*ast.File{f}, info) // ignore result
2034 for e, tv := range info.Types {
2035 if _, ok := e.(*ast.CallExpr); ok {
2036 if tv.Type != Typ[Int16] {
2037 t.Errorf("CallExpr has type %v, want int16", tv.Type)
2042 t.Errorf("CallExpr has no type")
2045 // TestCompositeLitTypes verifies that Info.Types registers the correct
2046 // types for composite literal expressions and composite literal type
2048 func TestCompositeLitTypes(t *testing.T) {
2049 for _, test := range []struct {
2052 {`[16]byte{}`, `[16]byte`},
2053 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
2054 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
2055 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
2056 {`[]int{}`, `[]int`},
2057 {`map[string]bool{"foo": true}`, `map[string]bool`},
2058 {`struct{}{}`, `struct{}`},
2059 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
2061 fset := token.NewFileSet()
2062 f, err := parser.ParseFile(fset, test.lit, "package p; var _ = "+test.lit, 0)
2064 t.Fatalf("%s: %v", test.lit, err)
2068 Types: make(map[ast.Expr]TypeAndValue),
2070 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
2071 t.Fatalf("%s: %v", test.lit, err)
2074 cmptype := func(x ast.Expr, want string) {
2075 tv, ok := info.Types[x]
2077 t.Errorf("%s: no Types entry found", test.lit)
2081 t.Errorf("%s: type is nil", test.lit)
2084 if got := tv.Type.String(); got != want {
2085 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2089 // test type of composite literal expression
2090 rhs := f.Decls[0].(*ast.GenDecl).Specs[0].(*ast.ValueSpec).Values[0]
2091 cmptype(rhs, test.typ)
2093 // test type of composite literal type expression
2094 cmptype(rhs.(*ast.CompositeLit).Type, test.typ)
2098 // TestObjectParents verifies that objects have parent scopes or not
2099 // as specified by the Object interface.
2100 func TestObjectParents(t *testing.T) {
2119 func f(x int) { y := x; print(y) }
2122 fset := token.NewFileSet()
2123 f, err := parser.ParseFile(fset, "src", src, 0)
2129 Defs: make(map[*ast.Ident]Object),
2131 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
2135 for ident, obj := range info.Defs {
2137 // only package names and implicit vars have a nil object
2138 // (in this test we only need to handle the package name)
2139 if ident.Name != "p" {
2140 t.Errorf("%v has nil object", ident)
2145 // struct fields, type-associated and interface methods
2146 // have no parent scope
2148 switch obj := obj.(type) {
2154 if obj.Type().(*Signature).Recv() != nil { // method
2159 gotParent := obj.Parent() != nil
2161 case gotParent && !wantParent:
2162 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2163 case !gotParent && wantParent:
2164 t.Errorf("%v: no parent found", ident)
2169 // TestFailedImport tests that we don't get follow-on errors
2170 // elsewhere in a package due to failing to import a package.
2171 func TestFailedImport(t *testing.T) {
2172 testenv.MustHaveGoBuild(t)
2177 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2182 func f(x T) T { return foo.F(x) }
2184 fset := token.NewFileSet()
2185 f, err := parser.ParseFile(fset, "src", src, 0)
2189 files := []*ast.File{f}
2191 // type-check using all possible importers
2192 for _, compiler := range []string{"gc", "gccgo", "source"} {
2195 Error: func(err error) {
2196 // we should only see the import error
2197 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2198 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2202 Importer: importer.For(compiler, nil),
2206 Uses: make(map[*ast.Ident]Object),
2208 pkg, _ := conf.Check("p", fset, files, info)
2210 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2214 imports := pkg.Imports()
2215 if len(imports) != 1 {
2216 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2220 if imp.Name() != "foo" {
2221 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2225 // verify that all uses of foo refer to the imported package foo (imp)
2226 for ident, obj := range info.Uses {
2227 if ident.Name == "foo" {
2228 if obj, ok := obj.(*PkgName); ok {
2229 if obj.Imported() != imp {
2230 t.Errorf("%s resolved to %v; want %v", ident, obj.Imported(), imp)
2233 t.Errorf("%s resolved to %v; want package name", ident, obj)
2240 func TestInstantiate(t *testing.T) {
2241 // eventually we like more tests but this is a start
2242 const src = "package p; type T[P any] *T[P]"
2243 pkg, err := pkgForMode(".", src, nil, 0)
2248 // type T should have one type parameter
2249 T := pkg.Scope().Lookup("T").Type().(*Named)
2250 if n := T.TypeParams().Len(); n != 1 {
2251 t.Fatalf("expected 1 type parameter; found %d", n)
2254 // instantiation should succeed (no endless recursion)
2255 // even with a nil *Checker
2256 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2261 // instantiated type should point to itself
2262 if p := res.Underlying().(*Pointer).Elem(); p != res {
2263 t.Fatalf("unexpected result type: %s points to %s", res, p)
2267 func TestInstantiateErrors(t *testing.T) {
2269 src string // by convention, T must be the type being instantiated
2271 wantAt int // -1 indicates no error
2273 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2274 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2275 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2276 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2279 for _, test := range tests {
2280 src := "package p; " + test.src
2281 pkg, err := pkgForMode(".", src, nil, 0)
2286 T := pkg.Scope().Lookup("T").Type().(*Named)
2288 _, err = Instantiate(nil, T, test.targs, true)
2290 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2293 var argErr *ArgumentError
2294 if !errors.As(err, &argErr) {
2295 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2298 if argErr.Index != test.wantAt {
2299 t.Errorf("Instantiate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2304 func TestArgumentErrorUnwrapping(t *testing.T) {
2305 var err error = &ArgumentError{
2307 Err: Error{Msg: "test"},
2310 if !errors.As(err, &e) {
2311 t.Fatalf("error %v does not wrap types.Error", err)
2313 if e.Msg != "test" {
2314 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2318 func TestInstanceIdentity(t *testing.T) {
2319 imports := make(testImporter)
2320 conf := Config{Importer: imports}
2321 makePkg := func(src string) {
2322 fset := token.NewFileSet()
2323 f, err := parser.ParseFile(fset, "", src, 0)
2328 pkg, err := conf.Check(name, fset, []*ast.File{f}, nil)
2334 makePkg(`package lib; type T[P any] struct{}`)
2335 makePkg(`package a; import "lib"; var A lib.T[int]`)
2336 makePkg(`package b; import "lib"; var B lib.T[int]`)
2337 a := imports["a"].Scope().Lookup("A")
2338 b := imports["b"].Scope().Lookup("B")
2339 if !Identical(a.Type(), b.Type()) {
2340 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2344 // TestInstantiatedObjects verifies properties of instantiated objects.
2345 func TestInstantiatedObjects(t *testing.T) {
2349 type T[P any] struct {
2353 func (recv *T[Q]) concreteMethod(mParam Q) (mResult Q) { return }
2355 type FT[P any] func(ftParam P) (ftResult P)
2357 func F[P any](fParam P) (fResult P){ return }
2359 type I[P any] interface {
2365 func (R[P]) m() {} // having a method triggers expansion of R
2380 Defs: make(map[*ast.Ident]Object),
2382 fset := token.NewFileSet()
2383 f, err := parser.ParseFile(fset, "p.go", src, 0)
2388 pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
2393 lookup := func(name string) Type { return pkg.Scope().Lookup(name).Type() }
2394 fnScope := pkg.Scope().Lookup("fn").(*Func).Scope()
2401 {"field", lookup("t").Underlying().(*Struct).Field(0)},
2402 {"field", fnScope.Lookup("r").Type().Underlying().(*Struct).Field(0)},
2404 // Methods and method fields
2405 {"concreteMethod", lookup("t").(*Named).Method(0)},
2406 {"recv", lookup("t").(*Named).Method(0).Type().(*Signature).Recv()},
2407 {"mParam", lookup("t").(*Named).Method(0).Type().(*Signature).Params().At(0)},
2408 {"mResult", lookup("t").(*Named).Method(0).Type().(*Signature).Results().At(0)},
2410 // Interface methods
2411 {"interfaceMethod", lookup("i").Underlying().(*Interface).Method(0)},
2413 // Function type fields
2414 {"ftParam", lookup("ft").Underlying().(*Signature).Params().At(0)},
2415 {"ftResult", lookup("ft").Underlying().(*Signature).Results().At(0)},
2418 {"fParam", lookup("f").(*Signature).Params().At(0)},
2419 {"fResult", lookup("f").(*Signature).Results().At(0)},
2422 // Collect all identifiers by name.
2423 idents := make(map[string][]*ast.Ident)
2424 ast.Inspect(f, func(n ast.Node) bool {
2425 if id, ok := n.(*ast.Ident); ok {
2426 idents[id.Name] = append(idents[id.Name], id)
2431 for _, test := range tests {
2433 t.Run(test.name, func(t *testing.T) {
2434 if got := len(idents[test.name]); got != 1 {
2435 t.Fatalf("found %d identifiers named %s, want 1", got, test.name)
2437 ident := idents[test.name][0]
2438 def := info.Defs[ident]
2439 if def == test.obj {
2440 t.Fatalf("info.Defs[%s] contains the test object", test.name)
2442 if orig := originObject(test.obj); def != orig {
2443 t.Errorf("info.Defs[%s] does not match obj.Origin()", test.name)
2445 if def.Pkg() != test.obj.Pkg() {
2446 t.Errorf("Pkg() = %v, want %v", def.Pkg(), test.obj.Pkg())
2448 if def.Name() != test.obj.Name() {
2449 t.Errorf("Name() = %v, want %v", def.Name(), test.obj.Name())
2451 if def.Pos() != test.obj.Pos() {
2452 t.Errorf("Pos() = %v, want %v", def.Pos(), test.obj.Pos())
2454 if def.Parent() != test.obj.Parent() {
2455 t.Fatalf("Parent() = %v, want %v", def.Parent(), test.obj.Parent())
2457 if def.Exported() != test.obj.Exported() {
2458 t.Fatalf("Exported() = %v, want %v", def.Exported(), test.obj.Exported())
2460 if def.Id() != test.obj.Id() {
2461 t.Fatalf("Id() = %v, want %v", def.Id(), test.obj.Id())
2463 // String and Type are expected to differ.
2468 func originObject(obj Object) Object {
2469 switch obj := obj.(type) {
2478 func TestImplements(t *testing.T) {
2482 type EmptyIface interface{}
2493 type Integer interface{
2494 int8 | int16 | int32 | int64
2497 type EmptyTypeSet interface{
2514 type Bad Bad // invalid type
2517 fset := token.NewFileSet()
2518 f, err := parser.ParseFile(fset, "p.go", src, 0)
2522 conf := Config{Error: func(error) {}}
2523 pkg, _ := conf.Check(f.Name.Name, fset, []*ast.File{f}, nil)
2525 lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
2527 EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
2528 I = lookup("I").(*Named)
2529 II = I.Underlying().(*Interface)
2530 C = lookup("C").(*Named)
2531 CI = C.Underlying().(*Interface)
2532 Integer = lookup("Integer").Underlying().(*Interface)
2533 EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
2535 N1p = NewPointer(N1)
2537 N2p = NewPointer(N2)
2552 {Typ[Int8], Integer, true},
2553 {Typ[Int64], Integer, true},
2554 {Typ[String], Integer, false},
2555 {EmptyTypeSet, II, true},
2556 {EmptyTypeSet, EmptyTypeSet, true},
2557 {Typ[Int], EmptyTypeSet, false},
2572 {Bad, EmptyIface, true},
2575 for _, test := range tests {
2576 if got := Implements(test.V, test.T); got != test.want {
2577 t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
2580 // The type assertion x.(T) is valid if T is an interface or if T implements the type of x.
2581 // The assertion is never valid if T is a bad type.
2585 if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
2588 if got := AssertableTo(V, T); got != want {
2589 t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
2594 func TestMissingMethodAlternative(t *testing.T) {
2616 pkg, err := pkgFor("p.go", src, nil)
2621 T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
2622 lookup := func(name string) (*Func, bool) {
2623 return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
2626 // V0 has method m with correct signature. Should not report wrongType.
2627 method, wrongType := lookup("V0")
2628 if method != nil || wrongType {
2629 t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
2632 checkMissingMethod := func(tname string, reportWrongType bool) {
2633 method, wrongType := lookup(tname)
2634 if method == nil || method.Name() != "m" || wrongType != reportWrongType {
2635 t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
2639 // V1 has no method m. Should not report wrongType.
2640 checkMissingMethod("V1", false)
2642 // V2 has method m with wrong signature type (ignoring receiver). Should report wrongType.
2643 checkMissingMethod("V2", true)
2645 // V3 has no method m but it exists on *V3. Should report wrongType.
2646 checkMissingMethod("V3", true)
2648 // V4 has no method m but has M. Should not report wrongType.
2649 checkMissingMethod("V4", false)