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.
25 // pkgFor parses and type checks the package specified by path and source,
26 // populating info if provided.
27 func pkgFor(path, source string, info *Info) (*Package, error) {
28 return pkgForMode(path, source, info, 0)
31 func pkgForMode(path, source string, info *Info, mode parser.Mode) (*Package, error) {
32 fset := token.NewFileSet()
33 f, err := parser.ParseFile(fset, path, source, mode)
37 conf := Config{Importer: importer.Default()}
38 return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
41 func mustTypecheck(t testing.TB, path, source string, info *Info) string {
42 pkg, err := pkgFor(path, source, info)
46 name = "package " + pkg.Name()
48 t.Fatalf("%s: didn't type-check (%s)", name, err)
53 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
54 fset := token.NewFileSet()
55 f, err := parser.ParseFile(fset, path, source, 0)
56 if f == nil { // ignore errors unless f is nil
57 t.Fatalf("%s: unable to parse: %s", path, err)
60 Error: func(err error) {},
61 Importer: importer.Default(),
63 pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
64 return pkg.Name(), err
67 func TestValuesInfo(t *testing.T) {
68 var tests = []struct {
70 expr string // constant expression
71 typ string // constant type
72 val string // constant value
74 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
75 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
76 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
77 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
78 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
79 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
81 {`package b0; var _ = false`, `false`, `bool`, `false`},
82 {`package b1; var _ = 0`, `0`, `int`, `0`},
83 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
84 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
85 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
86 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
88 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
89 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
90 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
92 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
93 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
94 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
96 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
97 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
98 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
100 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
101 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
102 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
104 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
105 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
106 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
108 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
109 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
110 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
111 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
112 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
113 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
115 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
116 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
117 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
118 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
120 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
121 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
122 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
123 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
124 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
125 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
126 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
127 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
129 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
130 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
131 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
132 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
133 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
134 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
135 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
136 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
137 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
139 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
140 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
142 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
143 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
146 for _, test := range tests {
148 Types: make(map[ast.Expr]TypeAndValue),
150 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
152 // look for expression
154 for e := range info.Types {
155 if ExprString(e) == test.expr {
161 t.Errorf("package %s: no expression found for %s", name, test.expr)
164 tv := info.Types[expr]
166 // check that type is correct
167 if got := tv.Type.String(); got != test.typ {
168 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
172 // if we have a constant, check that value is correct
174 if got := tv.Value.ExactString(); got != test.val {
175 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
179 t.Errorf("package %s: no constant found; want %s", name, test.val)
185 func TestTypesInfo(t *testing.T) {
186 // Test sources that are not expected to typecheck must start with the broken prefix.
187 const broken = "package broken_"
189 var tests = []struct {
191 expr string // expression
192 typ string // value type
194 // single-valued expressions of untyped constants
195 {`package b0; var x interface{} = false`, `false`, `bool`},
196 {`package b1; var x interface{} = 0`, `0`, `int`},
197 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
198 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
199 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
202 {`package n0; var _ *int = nil`, `nil`, `untyped nil`},
203 {`package n1; var _ func() = nil`, `nil`, `untyped nil`},
204 {`package n2; var _ []byte = nil`, `nil`, `untyped nil`},
205 {`package n3; var _ map[int]int = nil`, `nil`, `untyped nil`},
206 {`package n4; var _ chan int = nil`, `nil`, `untyped nil`},
207 {`package n5; var _ interface{} = nil`, `nil`, `untyped nil`},
208 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `untyped nil`},
210 {`package n10; var (x *int; _ = x == nil)`, `nil`, `untyped nil`},
211 {`package n11; var (x func(); _ = x == nil)`, `nil`, `untyped nil`},
212 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `untyped nil`},
213 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `untyped nil`},
214 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `untyped nil`},
215 {`package n15; var (x interface{}; _ = x == nil)`, `nil`, `untyped nil`},
216 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `untyped nil`},
218 {`package n20; var _ = (*int)(nil)`, `nil`, `untyped nil`},
219 {`package n21; var _ = (func())(nil)`, `nil`, `untyped nil`},
220 {`package n22; var _ = ([]byte)(nil)`, `nil`, `untyped nil`},
221 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `untyped nil`},
222 {`package n24; var _ = (chan int)(nil)`, `nil`, `untyped nil`},
223 {`package n25; var _ = (interface{})(nil)`, `nil`, `untyped nil`},
224 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `untyped nil`},
226 {`package n30; func f(*int) { f(nil) }`, `nil`, `untyped nil`},
227 {`package n31; func f(func()) { f(nil) }`, `nil`, `untyped nil`},
228 {`package n32; func f([]byte) { f(nil) }`, `nil`, `untyped nil`},
229 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `untyped nil`},
230 {`package n34; func f(chan int) { f(nil) }`, `nil`, `untyped nil`},
231 {`package n35; func f(interface{}) { f(nil) }`, `nil`, `untyped nil`},
232 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `untyped nil`},
234 // comma-ok expressions
235 {`package p0; var x interface{}; var _, _ = x.(int)`,
239 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
243 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
245 `(complex128, p2a.mybool)`,
247 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
249 `(complex128, bool)`,
251 {`package p3; var c chan string; var _, _ = <-c`,
257 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
261 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
265 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
269 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
273 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
279 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
283 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
287 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
291 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
295 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
299 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
305 {`package issue28277_a; func f(...int)`,
309 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
315 {`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`},
316 {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `untyped float`},
317 {`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`},
318 {`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`},
319 {`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`},
320 {`package issue47243_f; var x int32; var _ = 1 << 2`, `2`, `untyped int`},
321 {`package issue47243_g; var x int32; var _ = int(1) << 2`, `2`, `untyped int`},
322 {`package issue47243_h; var x int32; var _ = 1 << (2 << x)`, `1`, `int`},
323 {`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`},
324 {`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`},
326 // tests for broken code that doesn't parse or type-check
327 {broken + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
328 {broken + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
329 {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a; f: b;}}`, `b`, `string`},
330 {broken + `x3; var x = panic("");`, `panic`, `func(interface{})`},
331 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
332 {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
334 // parameterized functions
335 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
336 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
337 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
338 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
339 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
340 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
343 {`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
344 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
345 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
346 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
347 {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
349 // instantiated types must be sanitized
350 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
353 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
356 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
359 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
360 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
361 {`package u2a; func _[_ interface{int|string}]() {}`, `int | string`, `int|string`},
362 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string | ~bool`, `int|string|~bool`},
363 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string`, `int|string`},
364 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `~bool`, `~bool`},
365 {`package u3a; func _[_ interface{int|string|~float64|~bool}]() {}`, `int | string | ~float64`, `int|string|~float64`},
367 {`package u0b; func _[_ int]() {}`, `int`, `int`},
368 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
369 {`package u2b; func _[_ int|string]() {}`, `int | string`, `int|string`},
370 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string | ~bool`, `int|string|~bool`},
371 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string`, `int|string`},
372 {`package u3b; func _[_ int|string|~bool]() {}`, `~bool`, `~bool`},
373 {`package u3b; func _[_ int|string|~float64|~bool]() {}`, `int | string | ~float64`, `int|string|~float64`},
375 {`package u0c; type _ interface{int}`, `int`, `int`},
376 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
377 {`package u2c; type _ interface{int|string}`, `int | string`, `int|string`},
378 {`package u3c; type _ interface{int|string|~bool}`, `int | string | ~bool`, `int|string|~bool`},
379 {`package u3c; type _ interface{int|string|~bool}`, `int | string`, `int|string`},
380 {`package u3c; type _ interface{int|string|~bool}`, `~bool`, `~bool`},
381 {`package u3c; type _ interface{int|string|~float64|~bool}`, `int | string | ~float64`, `int|string|~float64`},
384 for _, test := range tests {
385 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
387 if strings.HasPrefix(test.src, broken) {
389 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
391 t.Errorf("package %s: expected to fail but passed", name)
395 name = mustTypecheck(t, "TypesInfo", test.src, &info)
398 // look for expression type
400 for e, tv := range info.Types {
401 if ExprString(e) == test.expr {
407 t.Errorf("package %s: no type found for %s", name, test.expr)
411 // check that type is correct
412 if got := typ.String(); got != test.typ {
413 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
418 func TestInstanceInfo(t *testing.T) {
419 const lib = `package lib
426 type testInst struct {
432 var tests = []struct {
434 instances []testInst // recorded instances in source order
436 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
437 []testInst{{`f`, []string{`int`}, `func(int)`}},
439 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
440 []testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
442 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
443 []testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
445 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
446 []testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
448 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
449 []testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
452 {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
453 []testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
455 {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
456 []testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
458 {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
460 {`C`, []string{`T`}, `interface{chan<- T}`},
461 {`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
464 {`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) }`,
466 {`C`, []string{`T`}, `interface{chan<- T}`},
467 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
468 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
472 {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
473 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
475 {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
476 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
478 {`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] }`,
480 {`C`, []string{`T`}, `interface{chan<- T}`},
481 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
482 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
485 {`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]) }`,
487 {`C`, []string{`T`}, `interface{chan<- T}`},
488 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
489 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
492 {`package i0; import "lib"; func _() { lib.F(42) }`,
493 []testInst{{`F`, []string{`int`}, `func(int)`}},
496 {`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
498 {`f`, []string{`int`}, `func(int)`},
499 {`f`, []string{`string`}, `func(string)`},
500 {`f`, []string{`int`}, `func(int)`},
503 {`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
505 {`F`, []string{`int`}, `func(int)`},
506 {`F`, []string{`string`}, `func(string)`},
507 {`F`, []string{`int`}, `func(int)`},
511 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
512 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
514 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
515 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
517 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
518 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
520 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
521 []testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
523 {`package type4; import "lib"; var _ lib.T[int]`,
524 []testInst{{`T`, []string{`int`}, `[]int`}},
527 {`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
529 {`T`, []string{`int`}, `struct{x int}`},
530 {`T`, []string{`int`}, `struct{x int}`},
533 {`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
535 {`T`, []string{`Q`}, `struct{x Q}`},
536 {`T`, []string{`Q`}, `struct{x Q}`},
539 {`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
541 {`T`, []string{`int`}, `[]int`},
542 {`T`, []string{`int`}, `[]int`},
543 {`T`, []string{`string`}, `[]string`},
548 for _, test := range tests {
549 imports := make(testImporter)
550 conf := Config{Importer: imports}
551 instMap := make(map[*ast.Ident]Instance)
552 useMap := make(map[*ast.Ident]Object)
553 makePkg := func(src string) *Package {
554 f, err := parser.ParseFile(fset, "p.go", src, 0)
558 pkg, err := conf.Check("", fset, []*ast.File{f}, &Info{Instances: instMap, Uses: useMap})
562 imports[pkg.Name()] = pkg
566 pkg := makePkg(test.src)
568 t.Run(pkg.Name(), func(t *testing.T) {
569 // Sort instances in source order for stability.
570 instances := sortedInstances(instMap)
571 if got, want := len(instances), len(test.instances); got != want {
572 t.Fatalf("got %d instances, want %d", got, want)
575 // Pairwise compare with the expected instances.
576 for ii, inst := range instances {
578 for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
579 targs = append(targs, inst.Inst.TypeArgs.At(i))
581 typ := inst.Inst.Type
583 testInst := test.instances[ii]
584 if got := inst.Ident.Name; got != testInst.name {
585 t.Fatalf("got name %s, want %s", got, testInst.name)
587 if len(targs) != len(testInst.targs) {
588 t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
590 for i, targ := range targs {
591 if got := targ.String(); got != testInst.targs[i] {
592 t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
595 if got := typ.Underlying().String(); got != testInst.typ {
596 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
599 // Verify the invariant that re-instantiating the corresponding generic
600 // type with TypeArgs results in an identical instance.
601 ptype := useMap[inst.Ident].Type()
602 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
603 if lister == nil || lister.TypeParams().Len() == 0 {
604 t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Ident, ptype)
606 inst2, err := Instantiate(nil, ptype, targs, true)
608 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
610 if !Identical(inst.Inst.Type, inst2) {
611 t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
618 type recordedInstance struct {
623 func sortedInstances(m map[*ast.Ident]Instance) (instances []recordedInstance) {
624 for id, inst := range m {
625 instances = append(instances, recordedInstance{id, inst})
627 sort.Slice(instances, func(i, j int) bool {
628 return instances[i].Ident.Pos() < instances[j].Ident.Pos()
633 func TestDefsInfo(t *testing.T) {
634 var tests = []struct {
639 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
640 {`package p1; const x int = 42`, `x`, `const p1.x int`},
641 {`package p2; var x int`, `x`, `var p2.x int`},
642 {`package p3; type x int`, `x`, `type p3.x int`},
643 {`package p4; func f()`, `f`, `func p4.f()`},
644 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
646 // Tests using generics.
647 {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
648 {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
649 {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
652 for _, test := range tests {
654 Defs: make(map[*ast.Ident]Object),
656 name := mustTypecheck(t, "DefsInfo", test.src, &info)
660 for id, obj := range info.Defs {
661 if id.Name == test.obj {
667 t.Errorf("package %s: %s not found", name, test.obj)
671 if got := def.String(); got != test.want {
672 t.Errorf("package %s: got %s; want %s", name, got, test.want)
677 func TestUsesInfo(t *testing.T) {
678 var tests = []struct {
683 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
684 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
685 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
686 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
687 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
689 // Tests using generics.
690 {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
691 {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
692 {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
693 {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
695 // Uses of fields are instantiated.
696 {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
697 {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
699 // Uses of methods are uses of the instantiated method.
700 {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
701 {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
702 {`package m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
703 {`package m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
704 {`package m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
705 {`package m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m5.T[B]).m() B`},
706 {`package m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m6.T[B]).m()`},
707 {`package m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (m7.T[int]).m() int`},
708 {`package m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (m8.T[int]).m()`},
709 {`package m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (m9.T[int]).m()`},
711 `package m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
713 `func (m10.E[int]).m()`,
715 {`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()`},
716 {`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()`},
719 for _, test := range tests {
721 Uses: make(map[*ast.Ident]Object),
723 name := mustTypecheck(t, "UsesInfo", test.src, &info)
727 for id, obj := range info.Uses {
728 if id.Name == test.obj {
730 panic(fmt.Sprintf("multiple uses of %q", id.Name))
736 t.Errorf("package %s: %s not found", name, test.obj)
740 if got := use.String(); got != test.want {
741 t.Errorf("package %s: got %s; want %s", name, got, test.want)
746 func TestGenericMethodInfo(t *testing.T) {
751 func (r N[B]) m() { r.m(); r.n() }
753 func (r *N[C]) n() { }
755 fset := token.NewFileSet()
756 f, err := parser.ParseFile(fset, "p.go", src, 0)
761 Defs: make(map[*ast.Ident]Object),
762 Uses: make(map[*ast.Ident]Object),
763 Selections: make(map[*ast.SelectorExpr]*Selection),
766 pkg, err := conf.Check("p", fset, []*ast.File{f}, &info)
771 N := pkg.Scope().Lookup("N").Type().(*Named)
773 // Find the generic methods stored on N.
774 gm, gn := N.Method(0), N.Method(1)
775 if gm.Name() == "n" {
779 // Collect objects from info.
780 var dm, dn *Func // the declared methods
781 var dmm, dmn *Func // the methods used in the body of m
782 for _, decl := range f.Decls {
783 fdecl, ok := decl.(*ast.FuncDecl)
787 def := info.Defs[fdecl.Name].(*Func)
788 switch fdecl.Name.Name {
791 ast.Inspect(fdecl.Body, func(n ast.Node) bool {
792 if call, ok := n.(*ast.CallExpr); ok {
793 sel := call.Fun.(*ast.SelectorExpr)
794 use := info.Uses[sel.Sel].(*Func)
795 selection := info.Selections[sel]
796 if selection.Kind() != MethodVal {
797 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
799 if selection.Obj() != use {
800 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
802 switch sel.Sel.Name {
817 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
820 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
823 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
826 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
830 func TestImplicitsInfo(t *testing.T) {
831 testenv.MustHaveGoBuild(t)
833 var tests = []struct {
837 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
838 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
839 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
841 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
842 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
843 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
844 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
846 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
847 {`package p8; func f(int) {}`, "field: var int"},
848 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
849 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
851 // Tests using generics.
852 {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
853 {`package f1; func f[T any](int) {}`, "field: var int"},
854 {`package f2; func f[T any](T) {}`, "field: var T"},
855 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
856 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
857 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
858 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
859 {`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]"},
860 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
863 for _, test := range tests {
865 Implicits: make(map[ast.Node]Object),
867 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
869 // the test cases expect at most one Implicits entry
870 if len(info.Implicits) > 1 {
871 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
875 // extract Implicits entry, if any
877 for n, obj := range info.Implicits {
878 switch x := n.(type) {
879 case *ast.ImportSpec:
881 case *ast.CaseClause:
886 t.Fatalf("package %s: unexpected %T", name, x)
888 got += ": " + obj.String()
892 if got != test.want {
893 t.Errorf("package %s: got %q; want %q", name, got, test.want)
898 func predString(tv TypeAndValue) string {
900 pred := func(b bool, s string) {
903 buf.WriteString(", ")
909 pred(tv.IsVoid(), "void")
910 pred(tv.IsType(), "type")
911 pred(tv.IsBuiltin(), "builtin")
912 pred(tv.IsValue() && tv.Value != nil, "const")
913 pred(tv.IsValue() && tv.Value == nil, "value")
914 pred(tv.IsNil(), "nil")
915 pred(tv.Addressable(), "addressable")
916 pred(tv.Assignable(), "assignable")
917 pred(tv.HasOk(), "hasOk")
925 func TestPredicatesInfo(t *testing.T) {
926 testenv.MustHaveGoBuild(t)
928 var tests = []struct {
934 {`package n0; func f() { f() }`, `f()`, `void`},
937 {`package t0; type _ int`, `int`, `type`},
938 {`package t1; type _ []int`, `[]int`, `type`},
939 {`package t2; type _ func()`, `func()`, `type`},
940 {`package t3; type _ func(int)`, `int`, `type`},
941 {`package t3; type _ func(...int)`, `...int`, `type`},
944 {`package b0; var _ = len("")`, `len`, `builtin`},
945 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
948 {`package c0; var _ = 42`, `42`, `const`},
949 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
950 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
953 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
954 {`package v1; var _ = &[]int{1}`, `([]int literal)`, `value`},
955 {`package v2; var _ = func(){}`, `(func() literal)`, `value`},
956 {`package v4; func f() { _ = f }`, `f`, `value`},
957 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
958 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
960 // addressable (and thus assignable) operands
961 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
962 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
963 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
964 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
965 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
966 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
967 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
968 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
969 // composite literals are not addressable
971 // assignable but not addressable values
972 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
973 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
976 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
977 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
980 // - package names are collected in the Uses map
981 // - identifiers being declared are collected in the Defs map
982 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
983 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
984 {`package m2; const c = 0`, `c`, `<missing>`},
985 {`package m3; type T int`, `T`, `<missing>`},
986 {`package m4; var v int`, `v`, `<missing>`},
987 {`package m5; func f() {}`, `f`, `<missing>`},
988 {`package m6; func _(x int) {}`, `x`, `<missing>`},
989 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
990 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
993 for _, test := range tests {
994 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
995 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
997 // look for expression predicates
999 for e, tv := range info.Types {
1000 //println(name, ExprString(e))
1001 if ExprString(e) == test.expr {
1002 got = predString(tv)
1007 if got != test.pred {
1008 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
1013 func TestScopesInfo(t *testing.T) {
1014 testenv.MustHaveGoBuild(t)
1016 var tests = []struct {
1018 scopes []string // list of scope descriptors of the form kind:varlist
1020 {`package p0`, []string{
1023 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1026 {`package p2; func _() {}`, []string{
1029 {`package p3; func _(x, y int) {}`, []string{
1030 "file:", "func:x y",
1032 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1033 "file:", "func:x y z", // redeclaration of x
1035 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1036 "file:", "func:u x y",
1038 {`package p6; func _() { { var x int; _ = x } }`, []string{
1039 "file:", "func:", "block:x",
1041 {`package p7; func _() { if true {} }`, []string{
1042 "file:", "func:", "if:", "block:",
1044 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1045 "file:", "func:", "if:x", "block:y",
1047 {`package p9; func _() { switch x := 0; x {} }`, []string{
1048 "file:", "func:", "switch:x",
1050 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1051 "file:", "func:", "switch:x", "case:y", "case:",
1053 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1054 "file:", "func:t", "type switch:",
1056 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1057 "file:", "func:t", "type switch:t",
1059 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1060 "file:", "func:t", "type switch:", "case:x", // x implicitly declared
1062 {`package p14; func _() { select{} }`, []string{
1065 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1066 "file:", "func:c", "comm:",
1068 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1069 "file:", "func:c", "comm:i x",
1071 {`package p17; func _() { for{} }`, []string{
1072 "file:", "func:", "for:", "block:",
1074 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1075 "file:", "func:n", "for:i", "block:",
1077 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1078 "file:", "func:a", "range:i", "block:",
1080 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1081 "file:", "func:a", "range:i x", "block:",
1085 for _, test := range tests {
1086 info := Info{Scopes: make(map[ast.Node]*Scope)}
1087 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
1089 // number of scopes must match
1090 if len(info.Scopes) != len(test.scopes) {
1091 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1094 // scope descriptions must match
1095 for node, scope := range info.Scopes {
1096 kind := "<unknown node kind>"
1097 switch node.(type) {
1102 case *ast.BlockStmt:
1106 case *ast.SwitchStmt:
1108 case *ast.TypeSwitchStmt:
1109 kind = "type switch"
1110 case *ast.CaseClause:
1112 case *ast.CommClause:
1116 case *ast.RangeStmt:
1120 // look for matching scope description
1121 desc := kind + ":" + strings.Join(scope.Names(), " ")
1123 for _, d := range test.scopes {
1130 t.Errorf("package %s: no matching scope found for %s", name, desc)
1136 func TestInitOrderInfo(t *testing.T) {
1137 var tests = []struct {
1141 {`package p0; var (x = 1; y = x)`, []string{
1144 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1145 "a = 1", "b = 2", "c = 3",
1147 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1148 "a = 1", "b = 2", "c = 3",
1150 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1151 "_ = f()", // blank var
1153 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1154 "a = 0", "z = 0", "y = z", "x = y",
1156 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1157 "a, _ = m[0]", // blank var
1159 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1160 "z = 0", "a, b = f()",
1162 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1163 "b = 1", "a = (func() int literal)()",
1165 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1166 "c = 1", "a, b = (func() (_, _ int) literal)()",
1168 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1171 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1172 "a = 0", "b = 0", "c = 0", "d = c + b",
1174 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1175 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1177 // emit an initializer for n:1 initializations only once (not for each node
1178 // on the lhs which may appear in different order in the dependency graph)
1179 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1180 "b = 0", "x, y = m[0]", "a = x",
1182 // test case from spec section on package initialization
1196 "d = 3", "b = f()", "c = f()", "a = c + b",
1198 // test case for issue 7131
1202 func next() int { counter++; return counter }
1205 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1208 var b, c = next(), next()
1209 var d, e, f = next(), next(), next()
1211 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1213 // test case for issue 10709
1223 func (T) m() int { return 0 }
1225 func makeT(n int) T {
1231 "t = makeT(0)", "v = t.m()",
1233 // test case for issue 10709: same as test before, but variable decls swapped
1243 func (T) m() int { return 0 }
1245 func makeT(n int) T {
1251 "t = makeT(0)", "v = t.m()",
1253 // another candidate possibly causing problems with issue 10709
1258 func f1() int { return g1() }
1259 func g1() int { f1(); return x1 }
1265 func f2() int { return g2() }
1266 func g2() int { return x2 }
1268 var x2 = 0`, []string{
1269 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1273 for _, test := range tests {
1275 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1277 // number of initializers must match
1278 if len(info.InitOrder) != len(test.inits) {
1279 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1283 // initializers must match
1284 for i, want := range test.inits {
1285 got := info.InitOrder[i].String()
1287 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1294 func TestMultiFileInitOrder(t *testing.T) {
1295 fset := token.NewFileSet()
1296 mustParse := func(src string) *ast.File {
1297 f, err := parser.ParseFile(fset, "main", src, 0)
1304 fileA := mustParse(`package main; var a = 1`)
1305 fileB := mustParse(`package main; var b = 2`)
1307 // The initialization order must not depend on the parse
1308 // order of the files, only on the presentation order to
1309 // the type-checker.
1310 for _, test := range []struct {
1314 {[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"},
1315 {[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"},
1318 if _, err := new(Config).Check("main", fset, test.files, &info); err != nil {
1321 if got := fmt.Sprint(info.InitOrder); got != test.want {
1322 t.Fatalf("got %s; want %s", got, test.want)
1327 func TestFiles(t *testing.T) {
1328 var sources = []string{
1329 "package p; type T struct{}; func (T) m1() {}",
1330 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1331 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1336 fset := token.NewFileSet()
1337 pkg := NewPackage("p", "p")
1339 check := NewChecker(&conf, fset, pkg, &info)
1341 for i, src := range sources {
1342 filename := fmt.Sprintf("sources%d", i)
1343 f, err := parser.ParseFile(fset, filename, src, 0)
1347 if err := check.Files([]*ast.File{f}); err != nil {
1352 // check InitOrder is [x y]
1354 for _, init := range info.InitOrder {
1355 for _, v := range init.Lhs {
1356 vars = append(vars, v.Name())
1359 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1360 t.Errorf("InitOrder == %s, want %s", got, want)
1364 type testImporter map[string]*Package
1366 func (m testImporter) Import(path string) (*Package, error) {
1367 if pkg := m[path]; pkg != nil {
1370 return nil, fmt.Errorf("package %q not found", path)
1373 func TestSelection(t *testing.T) {
1374 selections := make(map[*ast.SelectorExpr]*Selection)
1376 fset := token.NewFileSet()
1377 imports := make(testImporter)
1378 conf := Config{Importer: imports}
1379 makePkg := func(path, src string) {
1380 f, err := parser.ParseFile(fset, path+".go", src, 0)
1384 pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
1418 type G[P any] struct {
1430 // qualified identifiers
1468 // method expressions
1476 wantOut := map[string][2]string{
1477 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1479 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1480 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1481 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1482 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1483 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1484 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1485 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1486 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1487 "Inst.p": {"field (main.G[int]) p int", ".[0]"},
1489 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1490 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1491 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1492 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1493 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1494 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1495 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1496 "C{}.g": {"method (main.C) g()", ".[0]"},
1497 "new(C).g": {"method (*main.C) g()", "->[0]"},
1498 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1499 "Inst.m": {"method (main.G[int]) m(int)", ".[0]"},
1501 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1502 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1503 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1504 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1505 "G[string].m": {"method expr (main.G[string]) m(main.G[string], string)", ".[0]"},
1506 "G[string]{}.p": {"field (main.G[string]) p string", ".[0]"},
1509 makePkg("lib", libSrc)
1510 makePkg("main", mainSrc)
1512 for e, sel := range selections {
1513 _ = sel.String() // assertion: must not panic
1515 start := fset.Position(e.Pos()).Offset
1516 end := fset.Position(e.End()).Offset
1517 syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1525 fmt.Sprintf("%s%v", direct, sel.Index()),
1527 want := wantOut[syntax]
1529 t.Errorf("%s: got %q; want %q", syntax, got, want)
1531 delete(wantOut, syntax)
1533 // We must explicitly assert properties of the
1534 // Signature's receiver since it doesn't participate
1535 // in Identical() or String().
1536 sig, _ := sel.Type().(*Signature)
1537 if sel.Kind() == MethodVal {
1538 got := sig.Recv().Type()
1540 if !Identical(got, want) {
1541 t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
1543 } else if sig != nil && sig.Recv() != nil {
1544 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1547 // Assert that all wantOut entries were used exactly once.
1548 for syntax := range wantOut {
1549 t.Errorf("no ast.Selection found with syntax %q", syntax)
1553 func TestIssue8518(t *testing.T) {
1554 fset := token.NewFileSet()
1555 imports := make(testImporter)
1557 Error: func(err error) { t.Log(err) }, // don't exit after first error
1560 makePkg := func(path, src string) {
1561 f, err := parser.ParseFile(fset, path, src, 0)
1565 pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
1573 const C2 = missing.C
1583 makePkg("a", libSrc)
1584 makePkg("main", mainSrc) // don't crash when type-checking this package
1587 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1588 // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
1590 const want = "LookupFieldOrMethod on nil type"
1592 if s, ok := p.(string); !ok || s != want {
1593 t.Fatalf("got %v, want %s", p, want)
1596 LookupFieldOrMethod(nil, false, nil, "")
1599 func TestLookupFieldOrMethod(t *testing.T) {
1600 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1601 // addressable value, and x for a non-addressable value (even though a variable
1602 // for ease of test case writing).
1604 // Should be kept in sync with TestMethodSet.
1605 var tests = []struct {
1612 {"var x T; type T struct{}", false, nil, false},
1613 {"var x T; type T struct{ f int }", true, []int{0}, false},
1614 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1616 // field lookups on a generic type
1617 {"var x T[int]; type T[P any] struct{}", false, nil, false},
1618 {"var x T[int]; type T[P any] struct{ f P }", true, []int{0}, false},
1619 {"var x T[int]; type T[P any] struct{ a, b, f, c P }", true, []int{2}, false},
1622 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1623 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1624 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1625 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1627 // method lookups on a generic type
1628 {"var a T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, false},
1629 {"var a *T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, true},
1630 {"var a T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, false},
1631 {"var a *T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1634 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1635 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1637 // collisions on a generic type
1638 {"type ( E1[P any] struct{ f P }; E2[P any] struct{ f P }; x struct{ E1[int]; *E2[int] })", false, []int{1, 0}, false},
1639 {"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},
1641 // outside methodset
1642 // (*T).f method exists, but value of type T is not addressable
1643 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1645 // outside method set of a generic type
1646 {"var x T[int]; type T[P any] struct{}; func (*T[P]) f() {}", false, nil, true},
1648 // recursive generic types; see golang/go#52715
1649 {"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},
1650 {"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},
1653 for _, test := range tests {
1654 pkg, err := pkgForMode("test", "package p;"+test.src, nil, 0)
1656 t.Errorf("%s: incorrect test case: %s", test.src, err)
1660 obj := pkg.Scope().Lookup("a")
1662 if obj = pkg.Scope().Lookup("x"); obj == nil {
1663 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1668 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1669 if (f != nil) != test.found {
1671 t.Errorf("%s: got no object; want one", test.src)
1673 t.Errorf("%s: got object = %v; want none", test.src, f)
1676 if !sameSlice(index, test.index) {
1677 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1679 if indirect != test.indirect {
1680 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1685 // Test for golang/go#52715
1686 func TestLookupFieldOrMethod_RecursiveGeneric(t *testing.T) {
1690 type Tree[T any] struct {
1694 func (*Tree[R]) N(r R) R { return r }
1696 type Node[T any] struct {
1700 type Instance = *Tree[int]
1703 fset := token.NewFileSet()
1704 f, err := parser.ParseFile(fset, "foo.go", src, 0)
1708 pkg := NewPackage("pkg", f.Name.Name)
1709 if err := NewChecker(nil, fset, pkg, nil).Files([]*ast.File{f}); err != nil {
1713 T := pkg.Scope().Lookup("Instance").Type()
1714 _, _, _ = LookupFieldOrMethod(T, false, pkg, "M") // verify that LookupFieldOrMethod terminates
1717 func sameSlice(a, b []int) bool {
1718 if len(a) != len(b) {
1721 for i, x := range a {
1729 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1730 // the correct result at various positions with the source.
1731 func TestScopeLookupParent(t *testing.T) {
1732 fset := token.NewFileSet()
1733 imports := make(testImporter)
1734 conf := Config{Importer: imports}
1735 mustParse := func(src string) *ast.File {
1736 f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments)
1743 makePkg := func(path string, files ...*ast.File) {
1745 imports[path], err = conf.Check(path, fset, files, &info)
1751 makePkg("lib", mustParse("package lib; var X int"))
1752 // Each /*name=kind:line*/ comment makes the test look up the
1753 // name at that point and checks that it resolves to a decl of
1754 // the specified kind and line number. "undef" means undefined.
1756 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1767 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1768 type /*t=undef*/ t /*t=typename:14*/ *t
1769 print(Y) /*Y=var:10*/
1770 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1771 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1774 for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
1777 switch y := i.(type) { /*y=undef*/
1778 case /*y=undef*/ int /*y=var:23*/ :
1779 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1780 default /*y=var:23*/:
1785 switch int := i.(type) {
1786 case /*int=typename:0*/ int /*int=var:31*/ :
1788 default /*int=var:31*/ :
1794 info.Uses = make(map[*ast.Ident]Object)
1795 f := mustParse(mainSrc)
1797 mainScope := imports["main"].Scope()
1798 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1799 for _, group := range f.Comments {
1800 for _, comment := range group.List {
1801 // Parse the assertion in the comment.
1802 m := rx.FindStringSubmatch(comment.Text)
1804 t.Errorf("%s: bad comment: %s",
1805 fset.Position(comment.Pos()), comment.Text)
1808 name, want := m[1], m[2]
1810 // Look up the name in the innermost enclosing scope.
1811 inner := mainScope.Innermost(comment.Pos())
1813 t.Errorf("%s: at %s: can't find innermost scope",
1814 fset.Position(comment.Pos()), comment.Text)
1818 if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil {
1819 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
1820 got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line)
1823 t.Errorf("%s: at %s: %s resolved to %s, want %s",
1824 fset.Position(comment.Pos()), comment.Text, name, got, want)
1829 // Check that for each referring identifier,
1830 // a lookup of its name on the innermost
1831 // enclosing scope returns the correct object.
1833 for id, wantObj := range info.Uses {
1834 inner := mainScope.Innermost(id.Pos())
1836 t.Errorf("%s: can't find innermost scope enclosing %q",
1837 fset.Position(id.Pos()), id.Name)
1841 // Exclude selectors and qualified identifiers---lexical
1842 // refs only. (Ideally, we'd see if the AST parent is a
1843 // SelectorExpr, but that requires PathEnclosingInterval
1844 // from golang.org/x/tools/go/ast/astutil.)
1849 _, gotObj := inner.LookupParent(id.Name, id.Pos())
1850 if gotObj != wantObj {
1851 t.Errorf("%s: got %v, want %v",
1852 fset.Position(id.Pos()), gotObj, wantObj)
1858 // newDefined creates a new defined type named T with the given underlying type.
1859 // Helper function for use with TestIncompleteInterfaces only.
1860 func newDefined(underlying Type) *Named {
1861 tname := NewTypeName(token.NoPos, nil, "T", nil)
1862 return NewNamed(tname, underlying, nil)
1865 func TestConvertibleTo(t *testing.T) {
1866 for _, test := range []struct {
1870 {Typ[Int], Typ[Int], true},
1871 {Typ[Int], Typ[Float32], true},
1872 {Typ[Int], Typ[String], true},
1873 {newDefined(Typ[Int]), Typ[Int], true},
1874 {newDefined(new(Struct)), new(Struct), true},
1875 {newDefined(Typ[Int]), new(Struct), false},
1876 {Typ[UntypedInt], Typ[Int], true},
1877 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1878 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1879 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1880 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1881 {Typ[UntypedString], Typ[String], true},
1883 if got := ConvertibleTo(test.v, test.t); got != test.want {
1884 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1889 func TestAssignableTo(t *testing.T) {
1890 for _, test := range []struct {
1894 {Typ[Int], Typ[Int], true},
1895 {Typ[Int], Typ[Float32], false},
1896 {newDefined(Typ[Int]), Typ[Int], false},
1897 {newDefined(new(Struct)), new(Struct), true},
1898 {Typ[UntypedBool], Typ[Bool], true},
1899 {Typ[UntypedString], Typ[Bool], false},
1900 // Neither untyped string nor untyped numeric assignments arise during
1901 // normal type checking, so the below behavior is technically undefined by
1903 {Typ[UntypedString], Typ[String], true},
1904 {Typ[UntypedInt], Typ[Int], true},
1906 if got := AssignableTo(test.v, test.t); got != test.want {
1907 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1912 func TestIdentical(t *testing.T) {
1913 // For each test, we compare the types of objects X and Y in the source.
1919 {"var X int; var Y int", true},
1920 {"var X int; var Y string", false},
1922 // TODO: add more tests for complex types.
1925 {"type X int; type Y int", false},
1928 {"type X = int; type Y = int", true},
1931 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1932 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1933 {`func X(int) string { return "" }; func Y(int) {}`, false},
1935 // Generic functions. Type parameters should be considered identical modulo
1936 // renaming. See also issue #49722.
1937 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1938 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1939 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1940 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1941 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1942 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1945 for _, test := range tests {
1946 pkg, err := pkgForMode("test", "package p;"+test.src, nil, 0)
1948 t.Errorf("%s: incorrect test case: %s", test.src, err)
1951 X := pkg.Scope().Lookup("X")
1952 Y := pkg.Scope().Lookup("Y")
1953 if X == nil || Y == nil {
1954 t.Fatal("test must declare both X and Y")
1956 if got := Identical(X.Type(), Y.Type()); got != test.want {
1957 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1962 func TestIdentical_issue15173(t *testing.T) {
1963 // Identical should allow nil arguments and be symmetric.
1964 for _, test := range []struct {
1968 {Typ[Int], Typ[Int], true},
1969 {Typ[Int], nil, false},
1970 {nil, Typ[Int], false},
1973 if got := Identical(test.x, test.y); got != test.want {
1974 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1979 func TestIdenticalUnions(t *testing.T) {
1980 tname := NewTypeName(token.NoPos, nil, "myInt", nil)
1981 myInt := NewNamed(tname, Typ[Int], nil)
1982 tmap := map[string]*Term{
1983 "int": NewTerm(false, Typ[Int]),
1984 "~int": NewTerm(true, Typ[Int]),
1985 "string": NewTerm(false, Typ[String]),
1986 "~string": NewTerm(true, Typ[String]),
1987 "myInt": NewTerm(false, myInt),
1989 makeUnion := func(s string) *Union {
1990 parts := strings.Split(s, "|")
1992 for _, p := range parts {
1995 t.Fatalf("missing term %q", p)
1997 terms = append(terms, term)
1999 return NewUnion(terms)
2001 for _, test := range []struct {
2005 // These tests are just sanity checks. The tests for type sets and
2006 // interfaces provide much more test coverage.
2007 {"int|~int", "~int", true},
2008 {"myInt|~int", "~int", true},
2009 {"int|string", "string|int", true},
2010 {"int|int|string", "string|int", true},
2011 {"myInt|string", "int|string", false},
2013 x := makeUnion(test.x)
2014 y := makeUnion(test.y)
2015 if got := Identical(x, y); got != test.want {
2016 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
2021 func TestIssue15305(t *testing.T) {
2022 const src = "package p; func f() int16; var _ = f(undef)"
2023 fset := token.NewFileSet()
2024 f, err := parser.ParseFile(fset, "issue15305.go", src, 0)
2029 Error: func(err error) {}, // allow errors
2032 Types: make(map[ast.Expr]TypeAndValue),
2034 conf.Check("p", fset, []*ast.File{f}, info) // ignore result
2035 for e, tv := range info.Types {
2036 if _, ok := e.(*ast.CallExpr); ok {
2037 if tv.Type != Typ[Int16] {
2038 t.Errorf("CallExpr has type %v, want int16", tv.Type)
2043 t.Errorf("CallExpr has no type")
2046 // TestCompositeLitTypes verifies that Info.Types registers the correct
2047 // types for composite literal expressions and composite literal type
2049 func TestCompositeLitTypes(t *testing.T) {
2050 for _, test := range []struct {
2053 {`[16]byte{}`, `[16]byte`},
2054 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
2055 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
2056 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
2057 {`[]int{}`, `[]int`},
2058 {`map[string]bool{"foo": true}`, `map[string]bool`},
2059 {`struct{}{}`, `struct{}`},
2060 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
2062 fset := token.NewFileSet()
2063 f, err := parser.ParseFile(fset, test.lit, "package p; var _ = "+test.lit, 0)
2065 t.Fatalf("%s: %v", test.lit, err)
2069 Types: make(map[ast.Expr]TypeAndValue),
2071 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
2072 t.Fatalf("%s: %v", test.lit, err)
2075 cmptype := func(x ast.Expr, want string) {
2076 tv, ok := info.Types[x]
2078 t.Errorf("%s: no Types entry found", test.lit)
2082 t.Errorf("%s: type is nil", test.lit)
2085 if got := tv.Type.String(); got != want {
2086 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2090 // test type of composite literal expression
2091 rhs := f.Decls[0].(*ast.GenDecl).Specs[0].(*ast.ValueSpec).Values[0]
2092 cmptype(rhs, test.typ)
2094 // test type of composite literal type expression
2095 cmptype(rhs.(*ast.CompositeLit).Type, test.typ)
2099 // TestObjectParents verifies that objects have parent scopes or not
2100 // as specified by the Object interface.
2101 func TestObjectParents(t *testing.T) {
2120 func f(x int) { y := x; print(y) }
2123 fset := token.NewFileSet()
2124 f, err := parser.ParseFile(fset, "src", src, 0)
2130 Defs: make(map[*ast.Ident]Object),
2132 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
2136 for ident, obj := range info.Defs {
2138 // only package names and implicit vars have a nil object
2139 // (in this test we only need to handle the package name)
2140 if ident.Name != "p" {
2141 t.Errorf("%v has nil object", ident)
2146 // struct fields, type-associated and interface methods
2147 // have no parent scope
2149 switch obj := obj.(type) {
2155 if obj.Type().(*Signature).Recv() != nil { // method
2160 gotParent := obj.Parent() != nil
2162 case gotParent && !wantParent:
2163 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2164 case !gotParent && wantParent:
2165 t.Errorf("%v: no parent found", ident)
2170 // TestFailedImport tests that we don't get follow-on errors
2171 // elsewhere in a package due to failing to import a package.
2172 func TestFailedImport(t *testing.T) {
2173 testenv.MustHaveGoBuild(t)
2178 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2183 func f(x T) T { return foo.F(x) }
2185 fset := token.NewFileSet()
2186 f, err := parser.ParseFile(fset, "src", src, 0)
2190 files := []*ast.File{f}
2192 // type-check using all possible importers
2193 for _, compiler := range []string{"gc", "gccgo", "source"} {
2196 Error: func(err error) {
2197 // we should only see the import error
2198 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2199 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2203 Importer: importer.For(compiler, nil),
2207 Uses: make(map[*ast.Ident]Object),
2209 pkg, _ := conf.Check("p", fset, files, info)
2211 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2215 imports := pkg.Imports()
2216 if len(imports) != 1 {
2217 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2221 if imp.Name() != "foo" {
2222 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2226 // verify that all uses of foo refer to the imported package foo (imp)
2227 for ident, obj := range info.Uses {
2228 if ident.Name == "foo" {
2229 if obj, ok := obj.(*PkgName); ok {
2230 if obj.Imported() != imp {
2231 t.Errorf("%s resolved to %v; want %v", ident, obj.Imported(), imp)
2234 t.Errorf("%s resolved to %v; want package name", ident, obj)
2241 func TestInstantiate(t *testing.T) {
2242 // eventually we like more tests but this is a start
2243 const src = "package p; type T[P any] *T[P]"
2244 pkg, err := pkgForMode(".", src, nil, 0)
2249 // type T should have one type parameter
2250 T := pkg.Scope().Lookup("T").Type().(*Named)
2251 if n := T.TypeParams().Len(); n != 1 {
2252 t.Fatalf("expected 1 type parameter; found %d", n)
2255 // instantiation should succeed (no endless recursion)
2256 // even with a nil *Checker
2257 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2262 // instantiated type should point to itself
2263 if p := res.Underlying().(*Pointer).Elem(); p != res {
2264 t.Fatalf("unexpected result type: %s points to %s", res, p)
2268 func TestInstantiateErrors(t *testing.T) {
2270 src string // by convention, T must be the type being instantiated
2272 wantAt int // -1 indicates no error
2274 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2275 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2276 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2277 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2280 for _, test := range tests {
2281 src := "package p; " + test.src
2282 pkg, err := pkgForMode(".", src, nil, 0)
2287 T := pkg.Scope().Lookup("T").Type().(*Named)
2289 _, err = Instantiate(nil, T, test.targs, true)
2291 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2294 var argErr *ArgumentError
2295 if !errors.As(err, &argErr) {
2296 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2299 if argErr.Index != test.wantAt {
2300 t.Errorf("Instantiate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2305 func TestArgumentErrorUnwrapping(t *testing.T) {
2306 var err error = &ArgumentError{
2308 Err: Error{Msg: "test"},
2311 if !errors.As(err, &e) {
2312 t.Fatalf("error %v does not wrap types.Error", err)
2314 if e.Msg != "test" {
2315 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2319 func TestInstanceIdentity(t *testing.T) {
2320 imports := make(testImporter)
2321 conf := Config{Importer: imports}
2322 makePkg := func(src string) {
2323 fset := token.NewFileSet()
2324 f, err := parser.ParseFile(fset, "", src, 0)
2329 pkg, err := conf.Check(name, fset, []*ast.File{f}, nil)
2335 makePkg(`package lib; type T[P any] struct{}`)
2336 makePkg(`package a; import "lib"; var A lib.T[int]`)
2337 makePkg(`package b; import "lib"; var B lib.T[int]`)
2338 a := imports["a"].Scope().Lookup("A")
2339 b := imports["b"].Scope().Lookup("B")
2340 if !Identical(a.Type(), b.Type()) {
2341 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2345 // TestInstantiatedObjects verifies properties of instantiated objects.
2346 func TestInstantiatedObjects(t *testing.T) {
2350 type T[P any] struct {
2354 func (recv *T[Q]) concreteMethod(mParam Q) (mResult Q) { return }
2356 type FT[P any] func(ftParam P) (ftResult P)
2358 func F[P any](fParam P) (fResult P){ return }
2360 type I[P any] interface {
2366 func (R[P]) m() {} // having a method triggers expansion of R
2381 Defs: make(map[*ast.Ident]Object),
2383 fset := token.NewFileSet()
2384 f, err := parser.ParseFile(fset, "p.go", src, 0)
2389 pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
2394 lookup := func(name string) Type { return pkg.Scope().Lookup(name).Type() }
2395 fnScope := pkg.Scope().Lookup("fn").(*Func).Scope()
2402 {"field", lookup("t").Underlying().(*Struct).Field(0)},
2403 {"field", fnScope.Lookup("r").Type().Underlying().(*Struct).Field(0)},
2405 // Methods and method fields
2406 {"concreteMethod", lookup("t").(*Named).Method(0)},
2407 {"recv", lookup("t").(*Named).Method(0).Type().(*Signature).Recv()},
2408 {"mParam", lookup("t").(*Named).Method(0).Type().(*Signature).Params().At(0)},
2409 {"mResult", lookup("t").(*Named).Method(0).Type().(*Signature).Results().At(0)},
2411 // Interface methods
2412 {"interfaceMethod", lookup("i").Underlying().(*Interface).Method(0)},
2414 // Function type fields
2415 {"ftParam", lookup("ft").Underlying().(*Signature).Params().At(0)},
2416 {"ftResult", lookup("ft").Underlying().(*Signature).Results().At(0)},
2419 {"fParam", lookup("f").(*Signature).Params().At(0)},
2420 {"fResult", lookup("f").(*Signature).Results().At(0)},
2423 // Collect all identifiers by name.
2424 idents := make(map[string][]*ast.Ident)
2425 ast.Inspect(f, func(n ast.Node) bool {
2426 if id, ok := n.(*ast.Ident); ok {
2427 idents[id.Name] = append(idents[id.Name], id)
2432 for _, test := range tests {
2434 t.Run(test.name, func(t *testing.T) {
2435 if got := len(idents[test.name]); got != 1 {
2436 t.Fatalf("found %d identifiers named %s, want 1", got, test.name)
2438 ident := idents[test.name][0]
2439 def := info.Defs[ident]
2440 if def == test.obj {
2441 t.Fatalf("info.Defs[%s] contains the test object", test.name)
2443 if orig := originObject(test.obj); def != orig {
2444 t.Errorf("info.Defs[%s] does not match obj.Origin()", test.name)
2446 if def.Pkg() != test.obj.Pkg() {
2447 t.Errorf("Pkg() = %v, want %v", def.Pkg(), test.obj.Pkg())
2449 if def.Name() != test.obj.Name() {
2450 t.Errorf("Name() = %v, want %v", def.Name(), test.obj.Name())
2452 if def.Pos() != test.obj.Pos() {
2453 t.Errorf("Pos() = %v, want %v", def.Pos(), test.obj.Pos())
2455 if def.Parent() != test.obj.Parent() {
2456 t.Fatalf("Parent() = %v, want %v", def.Parent(), test.obj.Parent())
2458 if def.Exported() != test.obj.Exported() {
2459 t.Fatalf("Exported() = %v, want %v", def.Exported(), test.obj.Exported())
2461 if def.Id() != test.obj.Id() {
2462 t.Fatalf("Id() = %v, want %v", def.Id(), test.obj.Id())
2464 // String and Type are expected to differ.
2469 func originObject(obj Object) Object {
2470 switch obj := obj.(type) {
2479 func TestImplements(t *testing.T) {
2483 type EmptyIface interface{}
2494 type Integer interface{
2495 int8 | int16 | int32 | int64
2498 type EmptyTypeSet interface{
2515 type Bad Bad // invalid type
2518 fset := token.NewFileSet()
2519 f, err := parser.ParseFile(fset, "p.go", src, 0)
2523 conf := Config{Error: func(error) {}}
2524 pkg, _ := conf.Check(f.Name.Name, fset, []*ast.File{f}, nil)
2526 lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
2528 EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
2529 I = lookup("I").(*Named)
2530 II = I.Underlying().(*Interface)
2531 C = lookup("C").(*Named)
2532 CI = C.Underlying().(*Interface)
2533 Integer = lookup("Integer").Underlying().(*Interface)
2534 EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
2536 N1p = NewPointer(N1)
2538 N2p = NewPointer(N2)
2553 {Typ[Int8], Integer, true},
2554 {Typ[Int64], Integer, true},
2555 {Typ[String], Integer, false},
2556 {EmptyTypeSet, II, true},
2557 {EmptyTypeSet, EmptyTypeSet, true},
2558 {Typ[Int], EmptyTypeSet, false},
2573 {Bad, EmptyIface, true},
2576 for _, test := range tests {
2577 if got := Implements(test.V, test.T); got != test.want {
2578 t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
2581 // The type assertion x.(T) is valid if T is an interface or if T implements the type of x.
2582 // The assertion is never valid if T is a bad type.
2586 if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
2589 if got := AssertableTo(V, T); got != want {
2590 t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
2595 func TestMissingMethodAlternative(t *testing.T) {
2617 pkg, err := pkgFor("p.go", src, nil)
2622 T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
2623 lookup := func(name string) (*Func, bool) {
2624 return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
2627 // V0 has method m with correct signature. Should not report wrongType.
2628 method, wrongType := lookup("V0")
2629 if method != nil || wrongType {
2630 t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
2633 checkMissingMethod := func(tname string, reportWrongType bool) {
2634 method, wrongType := lookup(tname)
2635 if method == nil || method.Name() != "m" || wrongType != reportWrongType {
2636 t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
2640 // V1 has no method m. Should not report wrongType.
2641 checkMissingMethod("V1", false)
2643 // V2 has method m with wrong signature type (ignoring receiver). Should report wrongType.
2644 checkMissingMethod("V2", true)
2646 // V3 has no method m but it exists on *V3. Should report wrongType.
2647 checkMissingMethod("V3", true)
2649 // V4 has no method m but has M. Should not report wrongType.
2650 checkMissingMethod("V4", false)