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 // nopos indicates an unknown position
27 func parse(fset *token.FileSet, filename, src string) (*ast.File, error) {
28 return parser.ParseFile(fset, filename, src, 0)
31 func mustParse(fset *token.FileSet, filename, src string) *ast.File {
32 f, err := parse(fset, filename, src)
34 panic(err) // so we don't need to pass *testing.T
39 func typecheck(path, src string, conf *Config, info *Info) (*Package, error) {
40 fset := token.NewFileSet()
41 f, err := parse(fset, path, src)
42 if f == nil { // ignore errors unless f is nil
47 Error: func(err error) {}, // collect all errors
48 Importer: importer.Default(),
51 return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
54 func mustTypecheck(path, src string, conf *Config, info *Info) *Package {
55 pkg, err := typecheck(path, src, conf, info)
57 panic(err) // so we don't need to pass *testing.T
62 func TestValuesInfo(t *testing.T) {
63 var tests = []struct {
65 expr string // constant expression
66 typ string // constant type
67 val string // constant value
69 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
70 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
71 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
72 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
73 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
74 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
76 {`package b0; var _ = false`, `false`, `bool`, `false`},
77 {`package b1; var _ = 0`, `0`, `int`, `0`},
78 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
79 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
80 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
81 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
83 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
84 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
85 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
87 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
88 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
89 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
91 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
92 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
93 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
95 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
96 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
97 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
99 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
100 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
101 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
103 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
104 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
105 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
106 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
107 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
108 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
110 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
111 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
112 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
113 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
115 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
116 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
117 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
118 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
119 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
120 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
121 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
122 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
124 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
125 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
126 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
127 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
128 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
129 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
130 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
131 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
132 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
133 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
134 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
135 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
138 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
141 for _, test := range tests {
143 Types: make(map[ast.Expr]TypeAndValue),
145 name := mustTypecheck("ValuesInfo", test.src, nil, &info).Name()
147 // look for expression
149 for e := range info.Types {
150 if ExprString(e) == test.expr {
156 t.Errorf("package %s: no expression found for %s", name, test.expr)
159 tv := info.Types[expr]
161 // check that type is correct
162 if got := tv.Type.String(); got != test.typ {
163 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
167 // if we have a constant, check that value is correct
169 if got := tv.Value.ExactString(); got != test.val {
170 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
174 t.Errorf("package %s: no constant found; want %s", name, test.val)
180 func TestTypesInfo(t *testing.T) {
181 // Test sources that are not expected to typecheck must start with the broken prefix.
182 const broken = "package broken_"
184 var tests = []struct {
186 expr string // expression
187 typ string // value type
189 // single-valued expressions of untyped constants
190 {`package b0; var x interface{} = false`, `false`, `bool`},
191 {`package b1; var x interface{} = 0`, `0`, `int`},
192 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
193 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
194 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
197 {`package n0; var _ *int = nil`, `nil`, `untyped nil`},
198 {`package n1; var _ func() = nil`, `nil`, `untyped nil`},
199 {`package n2; var _ []byte = nil`, `nil`, `untyped nil`},
200 {`package n3; var _ map[int]int = nil`, `nil`, `untyped nil`},
201 {`package n4; var _ chan int = nil`, `nil`, `untyped nil`},
202 {`package n5; var _ interface{} = nil`, `nil`, `untyped nil`},
203 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `untyped nil`},
205 {`package n10; var (x *int; _ = x == nil)`, `nil`, `untyped nil`},
206 {`package n11; var (x func(); _ = x == nil)`, `nil`, `untyped nil`},
207 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `untyped nil`},
208 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `untyped nil`},
209 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `untyped nil`},
210 {`package n15; var (x interface{}; _ = x == nil)`, `nil`, `untyped nil`},
211 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `untyped nil`},
213 {`package n20; var _ = (*int)(nil)`, `nil`, `untyped nil`},
214 {`package n21; var _ = (func())(nil)`, `nil`, `untyped nil`},
215 {`package n22; var _ = ([]byte)(nil)`, `nil`, `untyped nil`},
216 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `untyped nil`},
217 {`package n24; var _ = (chan int)(nil)`, `nil`, `untyped nil`},
218 {`package n25; var _ = (interface{})(nil)`, `nil`, `untyped nil`},
219 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `untyped nil`},
221 {`package n30; func f(*int) { f(nil) }`, `nil`, `untyped nil`},
222 {`package n31; func f(func()) { f(nil) }`, `nil`, `untyped nil`},
223 {`package n32; func f([]byte) { f(nil) }`, `nil`, `untyped nil`},
224 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `untyped nil`},
225 {`package n34; func f(chan int) { f(nil) }`, `nil`, `untyped nil`},
226 {`package n35; func f(interface{}) { f(nil) }`, `nil`, `untyped nil`},
227 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `untyped nil`},
229 // comma-ok expressions
230 {`package p0; var x interface{}; var _, _ = x.(int)`,
234 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
238 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
240 `(complex128, p2a.mybool)`,
242 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
244 `(complex128, bool)`,
246 {`package p3; var c chan string; var _, _ = <-c`,
252 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
256 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
260 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
264 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
268 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
274 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
278 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
282 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
286 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
290 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
294 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
300 {`package issue28277_a; func f(...int)`,
304 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
310 {`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`},
311 {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `untyped float`},
312 {`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`},
313 {`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`},
314 {`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`},
315 {`package issue47243_f; var x int32; var _ = 1 << 2`, `2`, `untyped int`},
316 {`package issue47243_g; var x int32; var _ = int(1) << 2`, `2`, `untyped int`},
317 {`package issue47243_h; var x int32; var _ = 1 << (2 << x)`, `1`, `int`},
318 {`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`},
319 {`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`},
321 // tests for broken code that doesn't parse or type-check
322 {broken + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
323 {broken + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
324 {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a; f: b;}}`, `b`, `string`},
325 {broken + `x3; var x = panic("");`, `panic`, `func(interface{})`},
326 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
327 {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
329 // parameterized functions
330 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
331 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
332 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
333 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
334 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
335 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
338 {`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
339 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
340 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
341 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
342 {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
344 // instantiated types must be sanitized
345 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
348 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
351 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
354 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
355 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
356 {`package u2a; func _[_ interface{int | string}]() {}`, `int | string`, `int | string`},
357 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string | ~bool`, `int | string | ~bool`},
358 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string`, `int | string`},
359 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `~bool`, `~bool`},
360 {`package u3a; func _[_ interface{int | string | ~float64|~bool}]() {}`, `int | string | ~float64`, `int | string | ~float64`},
362 {`package u0b; func _[_ int]() {}`, `int`, `int`},
363 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
364 {`package u2b; func _[_ int | string]() {}`, `int | string`, `int | string`},
365 {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string | ~bool`, `int | string | ~bool`},
366 {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string`, `int | string`},
367 {`package u3b; func _[_ int | string | ~bool]() {}`, `~bool`, `~bool`},
368 {`package u3b; func _[_ int | string | ~float64|~bool]() {}`, `int | string | ~float64`, `int | string | ~float64`},
370 {`package u0c; type _ interface{int}`, `int`, `int`},
371 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
372 {`package u2c; type _ interface{int | string}`, `int | string`, `int | string`},
373 {`package u3c; type _ interface{int | string | ~bool}`, `int | string | ~bool`, `int | string | ~bool`},
374 {`package u3c; type _ interface{int | string | ~bool}`, `int | string`, `int | string`},
375 {`package u3c; type _ interface{int | string | ~bool}`, `~bool`, `~bool`},
376 {`package u3c; type _ interface{int | string | ~float64|~bool}`, `int | string | ~float64`, `int | string | ~float64`},
379 for _, test := range tests {
380 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
382 if strings.HasPrefix(test.src, broken) {
383 pkg, err := typecheck("TypesInfo", test.src, nil, &info)
385 t.Errorf("package %s: expected to fail but passed", pkg.Name())
392 name = mustTypecheck("TypesInfo", test.src, nil, &info).Name()
395 // look for expression type
397 for e, tv := range info.Types {
398 if ExprString(e) == test.expr {
404 t.Errorf("package %s: no type found for %s", name, test.expr)
408 // check that type is correct
409 if got := typ.String(); got != test.typ {
410 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
415 func TestInstanceInfo(t *testing.T) {
416 const lib = `package lib
423 type testInst struct {
429 var tests = []struct {
431 instances []testInst // recorded instances in source order
433 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
434 []testInst{{`f`, []string{`int`}, `func(int)`}},
436 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
437 []testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
439 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
440 []testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
442 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
443 []testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
445 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
446 []testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
449 {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
450 []testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
452 {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
453 []testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
455 {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
457 {`C`, []string{`T`}, `interface{chan<- T}`},
458 {`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
461 {`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) }`,
463 {`C`, []string{`T`}, `interface{chan<- T}`},
464 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
465 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
469 {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
470 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
472 {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
473 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
475 {`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] }`,
477 {`C`, []string{`T`}, `interface{chan<- T}`},
478 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
479 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
482 {`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]) }`,
484 {`C`, []string{`T`}, `interface{chan<- T}`},
485 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
486 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
489 {`package i0; import "lib"; func _() { lib.F(42) }`,
490 []testInst{{`F`, []string{`int`}, `func(int)`}},
493 {`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
495 {`f`, []string{`int`}, `func(int)`},
496 {`f`, []string{`string`}, `func(string)`},
497 {`f`, []string{`int`}, `func(int)`},
500 {`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
502 {`F`, []string{`int`}, `func(int)`},
503 {`F`, []string{`string`}, `func(string)`},
504 {`F`, []string{`int`}, `func(int)`},
508 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
509 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
511 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
512 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
514 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
515 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
517 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
518 []testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
520 {`package type4; import "lib"; var _ lib.T[int]`,
521 []testInst{{`T`, []string{`int`}, `[]int`}},
524 {`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
526 {`T`, []string{`int`}, `struct{x int}`},
527 {`T`, []string{`int`}, `struct{x int}`},
530 {`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
532 {`T`, []string{`Q`}, `struct{x Q}`},
533 {`T`, []string{`Q`}, `struct{x Q}`},
536 {`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
538 {`T`, []string{`int`}, `[]int`},
539 {`T`, []string{`int`}, `[]int`},
540 {`T`, []string{`string`}, `[]string`},
543 {`package issue51803; func foo[T any](T) {}; func _() { foo[int]( /* leave arg away on purpose */ ) }`,
544 []testInst{{`foo`, []string{`int`}, `func(int)`}},
548 for _, test := range tests {
549 imports := make(testImporter)
552 Error: func(error) {}, // ignore errors
554 instMap := make(map[*ast.Ident]Instance)
555 useMap := make(map[*ast.Ident]Object)
556 makePkg := func(src string) *Package {
557 pkg, _ := typecheck("p.go", src, &conf, &Info{Instances: instMap, Uses: useMap})
558 imports[pkg.Name()] = pkg
562 pkg := makePkg(test.src)
564 t.Run(pkg.Name(), func(t *testing.T) {
565 // Sort instances in source order for stability.
566 instances := sortedInstances(instMap)
567 if got, want := len(instances), len(test.instances); got != want {
568 t.Fatalf("got %d instances, want %d", got, want)
571 // Pairwise compare with the expected instances.
572 for ii, inst := range instances {
574 for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
575 targs = append(targs, inst.Inst.TypeArgs.At(i))
577 typ := inst.Inst.Type
579 testInst := test.instances[ii]
580 if got := inst.Ident.Name; got != testInst.name {
581 t.Fatalf("got name %s, want %s", got, testInst.name)
583 if len(targs) != len(testInst.targs) {
584 t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
586 for i, targ := range targs {
587 if got := targ.String(); got != testInst.targs[i] {
588 t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
591 if got := typ.Underlying().String(); got != testInst.typ {
592 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
595 // Verify the invariant that re-instantiating the corresponding generic
596 // type with TypeArgs results in an identical instance.
597 ptype := useMap[inst.Ident].Type()
598 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
599 if lister == nil || lister.TypeParams().Len() == 0 {
600 t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Ident, ptype)
602 inst2, err := Instantiate(nil, ptype, targs, true)
604 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
606 if !Identical(inst.Inst.Type, inst2) {
607 t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
614 type recordedInstance struct {
619 func sortedInstances(m map[*ast.Ident]Instance) (instances []recordedInstance) {
620 for id, inst := range m {
621 instances = append(instances, recordedInstance{id, inst})
623 sort.Slice(instances, func(i, j int) bool {
624 return CmpPos(instances[i].Ident.Pos(), instances[j].Ident.Pos()) < 0
629 func TestDefsInfo(t *testing.T) {
630 var tests = []struct {
635 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
636 {`package p1; const x int = 42`, `x`, `const p1.x int`},
637 {`package p2; var x int`, `x`, `var p2.x int`},
638 {`package p3; type x int`, `x`, `type p3.x int`},
639 {`package p4; func f()`, `f`, `func p4.f()`},
640 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
642 // Tests using generics.
643 {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
644 {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
645 {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
648 for _, test := range tests {
650 Defs: make(map[*ast.Ident]Object),
652 name := mustTypecheck("DefsInfo", test.src, nil, &info).Name()
656 for id, obj := range info.Defs {
657 if id.Name == test.obj {
663 t.Errorf("package %s: %s not found", name, test.obj)
667 if got := def.String(); got != test.want {
668 t.Errorf("package %s: got %s; want %s", name, got, test.want)
673 func TestUsesInfo(t *testing.T) {
674 var tests = []struct {
679 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
680 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
681 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
682 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
683 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
685 // Tests using generics.
686 {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
687 {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
688 {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
689 {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
691 // Uses of fields are instantiated.
692 {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
693 {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
695 // Uses of methods are uses of the instantiated method.
696 {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
697 {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
698 {`package m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
699 {`package m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
700 {`package m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
701 {`package m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m5.T[B]).m() B`},
702 {`package m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m6.T[B]).m()`},
703 {`package m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (m7.T[int]).m() int`},
704 {`package m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (m8.T[int]).m()`},
705 {`package m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (m9.T[int]).m()`},
707 `package m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
709 `func (m10.E[int]).m()`,
711 {`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()`},
712 {`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()`},
715 for _, test := range tests {
717 Uses: make(map[*ast.Ident]Object),
719 name := mustTypecheck("UsesInfo", test.src, nil, &info).Name()
723 for id, obj := range info.Uses {
724 if id.Name == test.obj {
726 panic(fmt.Sprintf("multiple uses of %q", id.Name))
732 t.Errorf("package %s: %s not found", name, test.obj)
736 if got := use.String(); got != test.want {
737 t.Errorf("package %s: got %s; want %s", name, got, test.want)
742 func TestGenericMethodInfo(t *testing.T) {
747 func (r N[B]) m() { r.m(); r.n() }
749 func (r *N[C]) n() { }
751 fset := token.NewFileSet()
752 f := mustParse(fset, "p.go", src)
754 Defs: make(map[*ast.Ident]Object),
755 Uses: make(map[*ast.Ident]Object),
756 Selections: make(map[*ast.SelectorExpr]*Selection),
759 pkg, err := conf.Check("p", fset, []*ast.File{f}, &info)
764 N := pkg.Scope().Lookup("N").Type().(*Named)
766 // Find the generic methods stored on N.
767 gm, gn := N.Method(0), N.Method(1)
768 if gm.Name() == "n" {
772 // Collect objects from info.
773 var dm, dn *Func // the declared methods
774 var dmm, dmn *Func // the methods used in the body of m
775 for _, decl := range f.Decls {
776 fdecl, ok := decl.(*ast.FuncDecl)
780 def := info.Defs[fdecl.Name].(*Func)
781 switch fdecl.Name.Name {
784 ast.Inspect(fdecl.Body, func(n ast.Node) bool {
785 if call, ok := n.(*ast.CallExpr); ok {
786 sel := call.Fun.(*ast.SelectorExpr)
787 use := info.Uses[sel.Sel].(*Func)
788 selection := info.Selections[sel]
789 if selection.Kind() != MethodVal {
790 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
792 if selection.Obj() != use {
793 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
795 switch sel.Sel.Name {
810 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
813 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
816 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
819 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
823 func TestImplicitsInfo(t *testing.T) {
824 testenv.MustHaveGoBuild(t)
826 var tests = []struct {
830 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
831 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
832 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
834 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
835 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
836 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
837 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
839 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
840 {`package p8; func f(int) {}`, "field: var int"},
841 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
842 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
844 // Tests using generics.
845 {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
846 {`package f1; func f[T any](int) {}`, "field: var int"},
847 {`package f2; func f[T any](T) {}`, "field: var T"},
848 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
849 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
850 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
851 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
852 {`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]"},
853 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
856 for _, test := range tests {
858 Implicits: make(map[ast.Node]Object),
860 name := mustTypecheck("ImplicitsInfo", test.src, nil, &info).Name()
862 // the test cases expect at most one Implicits entry
863 if len(info.Implicits) > 1 {
864 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
868 // extract Implicits entry, if any
870 for n, obj := range info.Implicits {
871 switch x := n.(type) {
872 case *ast.ImportSpec:
874 case *ast.CaseClause:
879 t.Fatalf("package %s: unexpected %T", name, x)
881 got += ": " + obj.String()
885 if got != test.want {
886 t.Errorf("package %s: got %q; want %q", name, got, test.want)
891 func predString(tv TypeAndValue) string {
892 var buf strings.Builder
893 pred := func(b bool, s string) {
896 buf.WriteString(", ")
902 pred(tv.IsVoid(), "void")
903 pred(tv.IsType(), "type")
904 pred(tv.IsBuiltin(), "builtin")
905 pred(tv.IsValue() && tv.Value != nil, "const")
906 pred(tv.IsValue() && tv.Value == nil, "value")
907 pred(tv.IsNil(), "nil")
908 pred(tv.Addressable(), "addressable")
909 pred(tv.Assignable(), "assignable")
910 pred(tv.HasOk(), "hasOk")
918 func TestPredicatesInfo(t *testing.T) {
919 testenv.MustHaveGoBuild(t)
921 var tests = []struct {
927 {`package n0; func f() { f() }`, `f()`, `void`},
930 {`package t0; type _ int`, `int`, `type`},
931 {`package t1; type _ []int`, `[]int`, `type`},
932 {`package t2; type _ func()`, `func()`, `type`},
933 {`package t3; type _ func(int)`, `int`, `type`},
934 {`package t3; type _ func(...int)`, `...int`, `type`},
937 {`package b0; var _ = len("")`, `len`, `builtin`},
938 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
941 {`package c0; var _ = 42`, `42`, `const`},
942 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
943 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
946 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
947 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
948 {`package v2; var _ = func(){}`, `(func() literal)`, `value`},
949 {`package v4; func f() { _ = f }`, `f`, `value`},
950 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
951 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
953 // addressable (and thus assignable) operands
954 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
955 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
956 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
957 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
958 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
959 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
960 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
961 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
962 // composite literals are not addressable
964 // assignable but not addressable values
965 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
966 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
969 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
970 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
973 // - package names are collected in the Uses map
974 // - identifiers being declared are collected in the Defs map
975 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
976 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
977 {`package m2; const c = 0`, `c`, `<missing>`},
978 {`package m3; type T int`, `T`, `<missing>`},
979 {`package m4; var v int`, `v`, `<missing>`},
980 {`package m5; func f() {}`, `f`, `<missing>`},
981 {`package m6; func _(x int) {}`, `x`, `<missing>`},
982 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
983 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
986 for _, test := range tests {
987 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
988 name := mustTypecheck("PredicatesInfo", test.src, nil, &info).Name()
990 // look for expression predicates
992 for e, tv := range info.Types {
993 //println(name, ExprString(e))
994 if ExprString(e) == test.expr {
1000 if got != test.pred {
1001 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
1006 func TestScopesInfo(t *testing.T) {
1007 testenv.MustHaveGoBuild(t)
1009 var tests = []struct {
1011 scopes []string // list of scope descriptors of the form kind:varlist
1013 {`package p0`, []string{
1016 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1019 {`package p2; func _() {}`, []string{
1022 {`package p3; func _(x, y int) {}`, []string{
1023 "file:", "func:x y",
1025 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1026 "file:", "func:x y z", // redeclaration of x
1028 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1029 "file:", "func:u x y",
1031 {`package p6; func _() { { var x int; _ = x } }`, []string{
1032 "file:", "func:", "block:x",
1034 {`package p7; func _() { if true {} }`, []string{
1035 "file:", "func:", "if:", "block:",
1037 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1038 "file:", "func:", "if:x", "block:y",
1040 {`package p9; func _() { switch x := 0; x {} }`, []string{
1041 "file:", "func:", "switch:x",
1043 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1044 "file:", "func:", "switch:x", "case:y", "case:",
1046 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1047 "file:", "func:t", "type switch:",
1049 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1050 "file:", "func:t", "type switch:t",
1052 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1053 "file:", "func:t", "type switch:", "case:x", // x implicitly declared
1055 {`package p14; func _() { select{} }`, []string{
1058 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1059 "file:", "func:c", "comm:",
1061 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1062 "file:", "func:c", "comm:i x",
1064 {`package p17; func _() { for{} }`, []string{
1065 "file:", "func:", "for:", "block:",
1067 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1068 "file:", "func:n", "for:i", "block:",
1070 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1071 "file:", "func:a", "range:i", "block:",
1073 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1074 "file:", "func:a", "range:i x", "block:",
1078 for _, test := range tests {
1079 info := Info{Scopes: make(map[ast.Node]*Scope)}
1080 name := mustTypecheck("ScopesInfo", test.src, nil, &info).Name()
1082 // number of scopes must match
1083 if len(info.Scopes) != len(test.scopes) {
1084 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1087 // scope descriptions must match
1088 for node, scope := range info.Scopes {
1089 kind := "<unknown node kind>"
1090 switch node.(type) {
1095 case *ast.BlockStmt:
1099 case *ast.SwitchStmt:
1101 case *ast.TypeSwitchStmt:
1102 kind = "type switch"
1103 case *ast.CaseClause:
1105 case *ast.CommClause:
1109 case *ast.RangeStmt:
1113 // look for matching scope description
1114 desc := kind + ":" + strings.Join(scope.Names(), " ")
1116 for _, d := range test.scopes {
1123 t.Errorf("package %s: no matching scope found for %s", name, desc)
1129 func TestInitOrderInfo(t *testing.T) {
1130 var tests = []struct {
1134 {`package p0; var (x = 1; y = x)`, []string{
1137 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1138 "a = 1", "b = 2", "c = 3",
1140 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1141 "a = 1", "b = 2", "c = 3",
1143 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1144 "_ = f()", // blank var
1146 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1147 "a = 0", "z = 0", "y = z", "x = y",
1149 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1150 "a, _ = m[0]", // blank var
1152 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1153 "z = 0", "a, b = f()",
1155 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1156 "b = 1", "a = (func() int literal)()",
1158 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1159 "c = 1", "a, b = (func() (_, _ int) literal)()",
1161 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1164 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1165 "a = 0", "b = 0", "c = 0", "d = c + b",
1167 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1168 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1170 // emit an initializer for n:1 initializations only once (not for each node
1171 // on the lhs which may appear in different order in the dependency graph)
1172 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1173 "b = 0", "x, y = m[0]", "a = x",
1175 // test case from spec section on package initialization
1189 "d = 3", "b = f()", "c = f()", "a = c + b",
1191 // test case for issue 7131
1195 func next() int { counter++; return counter }
1198 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1201 var b, c = next(), next()
1202 var d, e, f = next(), next(), next()
1204 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1206 // test case for issue 10709
1216 func (T) m() int { return 0 }
1218 func makeT(n int) T {
1224 "t = makeT(0)", "v = t.m()",
1226 // test case for issue 10709: same as test before, but variable decls swapped
1236 func (T) m() int { return 0 }
1238 func makeT(n int) T {
1244 "t = makeT(0)", "v = t.m()",
1246 // another candidate possibly causing problems with issue 10709
1251 func f1() int { return g1() }
1252 func g1() int { f1(); return x1 }
1258 func f2() int { return g2() }
1259 func g2() int { return x2 }
1261 var x2 = 0`, []string{
1262 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1266 for _, test := range tests {
1268 name := mustTypecheck("InitOrderInfo", test.src, nil, &info).Name()
1270 // number of initializers must match
1271 if len(info.InitOrder) != len(test.inits) {
1272 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1276 // initializers must match
1277 for i, want := range test.inits {
1278 got := info.InitOrder[i].String()
1280 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1287 func TestMultiFileInitOrder(t *testing.T) {
1288 fset := token.NewFileSet()
1289 fileA := mustParse(fset, "", `package main; var a = 1`)
1290 fileB := mustParse(fset, "", `package main; var b = 2`)
1292 // The initialization order must not depend on the parse
1293 // order of the files, only on the presentation order to
1294 // the type-checker.
1295 for _, test := range []struct {
1299 {[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"},
1300 {[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"},
1303 if _, err := new(Config).Check("main", fset, test.files, &info); err != nil {
1306 if got := fmt.Sprint(info.InitOrder); got != test.want {
1307 t.Fatalf("got %s; want %s", got, test.want)
1312 func TestFiles(t *testing.T) {
1313 var sources = []string{
1314 "package p; type T struct{}; func (T) m1() {}",
1315 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1316 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1321 fset := token.NewFileSet()
1322 pkg := NewPackage("p", "p")
1324 check := NewChecker(&conf, fset, pkg, &info)
1326 for i, src := range sources {
1327 filename := fmt.Sprintf("sources%d", i)
1328 f := mustParse(fset, filename, src)
1329 if err := check.Files([]*ast.File{f}); err != nil {
1334 // check InitOrder is [x y]
1336 for _, init := range info.InitOrder {
1337 for _, v := range init.Lhs {
1338 vars = append(vars, v.Name())
1341 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1342 t.Errorf("InitOrder == %s, want %s", got, want)
1346 type testImporter map[string]*Package
1348 func (m testImporter) Import(path string) (*Package, error) {
1349 if pkg := m[path]; pkg != nil {
1352 return nil, fmt.Errorf("package %q not found", path)
1355 func TestSelection(t *testing.T) {
1356 selections := make(map[*ast.SelectorExpr]*Selection)
1358 // We need a specific fileset in this test below for positions.
1359 // Cannot use typecheck helper.
1360 fset := token.NewFileSet()
1361 imports := make(testImporter)
1362 conf := Config{Importer: imports}
1363 makePkg := func(path, src string) {
1364 f := mustParse(fset, path+".go", src)
1365 pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
1399 type G[P any] struct {
1411 // qualified identifiers
1449 // method expressions
1457 wantOut := map[string][2]string{
1458 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1460 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1461 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1462 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1463 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1464 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1465 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1466 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1467 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1468 "Inst.p": {"field (main.G[int]) p int", ".[0]"},
1470 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1471 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1472 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1473 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1474 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1475 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1476 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1477 "C{}.g": {"method (main.C) g()", ".[0]"},
1478 "new(C).g": {"method (*main.C) g()", "->[0]"},
1479 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1480 "Inst.m": {"method (main.G[int]) m(int)", ".[0]"},
1482 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1483 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1484 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1485 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1486 "G[string].m": {"method expr (main.G[string]) m(main.G[string], string)", ".[0]"},
1487 "G[string]{}.p": {"field (main.G[string]) p string", ".[0]"},
1490 makePkg("lib", libSrc)
1491 makePkg("main", mainSrc)
1493 for e, sel := range selections {
1494 _ = sel.String() // assertion: must not panic
1496 start := fset.Position(e.Pos()).Offset
1497 end := fset.Position(e.End()).Offset
1498 syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1506 fmt.Sprintf("%s%v", direct, sel.Index()),
1508 want := wantOut[syntax]
1510 t.Errorf("%s: got %q; want %q", syntax, got, want)
1512 delete(wantOut, syntax)
1514 // We must explicitly assert properties of the
1515 // Signature's receiver since it doesn't participate
1516 // in Identical() or String().
1517 sig, _ := sel.Type().(*Signature)
1518 if sel.Kind() == MethodVal {
1519 got := sig.Recv().Type()
1521 if !Identical(got, want) {
1522 t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
1524 } else if sig != nil && sig.Recv() != nil {
1525 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1528 // Assert that all wantOut entries were used exactly once.
1529 for syntax := range wantOut {
1530 t.Errorf("no ast.Selection found with syntax %q", syntax)
1534 func TestIssue8518(t *testing.T) {
1535 fset := token.NewFileSet()
1536 imports := make(testImporter)
1538 Error: func(err error) { t.Log(err) }, // don't exit after first error
1541 makePkg := func(path, src string) {
1542 f := mustParse(fset, path, src)
1543 pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
1551 const C2 = missing.C
1561 makePkg("a", libSrc)
1562 makePkg("main", mainSrc) // don't crash when type-checking this package
1565 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1566 // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
1568 const want = "LookupFieldOrMethod on nil type"
1570 if s, ok := p.(string); !ok || s != want {
1571 t.Fatalf("got %v, want %s", p, want)
1574 LookupFieldOrMethod(nil, false, nil, "")
1577 func TestLookupFieldOrMethod(t *testing.T) {
1578 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1579 // addressable value, and x for a non-addressable value (even though a variable
1580 // for ease of test case writing).
1582 // Should be kept in sync with TestMethodSet.
1583 var tests = []struct {
1590 {"var x T; type T struct{}", false, nil, false},
1591 {"var x T; type T struct{ f int }", true, []int{0}, false},
1592 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1594 // field lookups on a generic type
1595 {"var x T[int]; type T[P any] struct{}", false, nil, false},
1596 {"var x T[int]; type T[P any] struct{ f P }", true, []int{0}, false},
1597 {"var x T[int]; type T[P any] struct{ a, b, f, c P }", true, []int{2}, false},
1600 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1601 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1602 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1603 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1605 // method lookups on a generic type
1606 {"var a T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, false},
1607 {"var a *T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, true},
1608 {"var a T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, false},
1609 {"var a *T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1612 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1613 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1615 // collisions on a generic type
1616 {"type ( E1[P any] struct{ f P }; E2[P any] struct{ f P }; x struct{ E1[int]; *E2[int] })", false, []int{1, 0}, false},
1617 {"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},
1619 // outside methodset
1620 // (*T).f method exists, but value of type T is not addressable
1621 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1623 // outside method set of a generic type
1624 {"var x T[int]; type T[P any] struct{}; func (*T[P]) f() {}", false, nil, true},
1626 // recursive generic types; see golang/go#52715
1627 {"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},
1628 {"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},
1631 for _, test := range tests {
1632 pkg := mustTypecheck("test", "package p;"+test.src, nil, nil)
1634 obj := pkg.Scope().Lookup("a")
1636 if obj = pkg.Scope().Lookup("x"); obj == nil {
1637 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1642 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1643 if (f != nil) != test.found {
1645 t.Errorf("%s: got no object; want one", test.src)
1647 t.Errorf("%s: got object = %v; want none", test.src, f)
1650 if !sameSlice(index, test.index) {
1651 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1653 if indirect != test.indirect {
1654 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1659 // Test for golang/go#52715
1660 func TestLookupFieldOrMethod_RecursiveGeneric(t *testing.T) {
1664 type Tree[T any] struct {
1668 func (*Tree[R]) N(r R) R { return r }
1670 type Node[T any] struct {
1674 type Instance = *Tree[int]
1677 fset := token.NewFileSet()
1678 f := mustParse(fset, "foo.go", src)
1679 pkg := NewPackage("pkg", f.Name.Name)
1680 if err := NewChecker(nil, fset, pkg, nil).Files([]*ast.File{f}); err != nil {
1684 T := pkg.Scope().Lookup("Instance").Type()
1685 _, _, _ = LookupFieldOrMethod(T, false, pkg, "M") // verify that LookupFieldOrMethod terminates
1688 func sameSlice(a, b []int) bool {
1689 if len(a) != len(b) {
1692 for i, x := range a {
1700 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1701 // the correct result at various positions with the source.
1702 func TestScopeLookupParent(t *testing.T) {
1703 fset := token.NewFileSet()
1704 imports := make(testImporter)
1705 conf := Config{Importer: imports}
1707 makePkg := func(path string, files ...*ast.File) {
1709 imports[path], err = conf.Check(path, fset, files, &info)
1715 makePkg("lib", mustParse(fset, "", "package lib; var X int"))
1716 // Each /*name=kind:line*/ comment makes the test look up the
1717 // name at that point and checks that it resolves to a decl of
1718 // the specified kind and line number. "undef" means undefined.
1720 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1731 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1732 type /*t=undef*/ t /*t=typename:14*/ *t
1733 print(Y) /*Y=var:10*/
1734 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1735 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1738 for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
1741 switch y := i.(type) { /*y=undef*/
1742 case /*y=undef*/ int /*y=var:23*/ :
1743 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1744 default /*y=var:23*/:
1749 switch int := i.(type) {
1750 case /*int=typename:0*/ int /*int=var:31*/ :
1752 default /*int=var:31*/ :
1758 info.Uses = make(map[*ast.Ident]Object)
1759 f := mustParse(fset, "", mainSrc)
1761 mainScope := imports["main"].Scope()
1762 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1763 for _, group := range f.Comments {
1764 for _, comment := range group.List {
1765 // Parse the assertion in the comment.
1766 m := rx.FindStringSubmatch(comment.Text)
1768 t.Errorf("%s: bad comment: %s",
1769 fset.Position(comment.Pos()), comment.Text)
1772 name, want := m[1], m[2]
1774 // Look up the name in the innermost enclosing scope.
1775 inner := mainScope.Innermost(comment.Pos())
1777 t.Errorf("%s: at %s: can't find innermost scope",
1778 fset.Position(comment.Pos()), comment.Text)
1782 if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil {
1783 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
1784 got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line)
1787 t.Errorf("%s: at %s: %s resolved to %s, want %s",
1788 fset.Position(comment.Pos()), comment.Text, name, got, want)
1793 // Check that for each referring identifier,
1794 // a lookup of its name on the innermost
1795 // enclosing scope returns the correct object.
1797 for id, wantObj := range info.Uses {
1798 inner := mainScope.Innermost(id.Pos())
1800 t.Errorf("%s: can't find innermost scope enclosing %q",
1801 fset.Position(id.Pos()), id.Name)
1805 // Exclude selectors and qualified identifiers---lexical
1806 // refs only. (Ideally, we'd see if the AST parent is a
1807 // SelectorExpr, but that requires PathEnclosingInterval
1808 // from golang.org/x/tools/go/ast/astutil.)
1813 _, gotObj := inner.LookupParent(id.Name, id.Pos())
1814 if gotObj != wantObj {
1815 t.Errorf("%s: got %v, want %v",
1816 fset.Position(id.Pos()), gotObj, wantObj)
1822 // newDefined creates a new defined type named T with the given underlying type.
1823 // Helper function for use with TestIncompleteInterfaces only.
1824 func newDefined(underlying Type) *Named {
1825 tname := NewTypeName(nopos, nil, "T", nil)
1826 return NewNamed(tname, underlying, nil)
1829 func TestConvertibleTo(t *testing.T) {
1830 for _, test := range []struct {
1834 {Typ[Int], Typ[Int], true},
1835 {Typ[Int], Typ[Float32], true},
1836 {Typ[Int], Typ[String], true},
1837 {newDefined(Typ[Int]), Typ[Int], true},
1838 {newDefined(new(Struct)), new(Struct), true},
1839 {newDefined(Typ[Int]), new(Struct), false},
1840 {Typ[UntypedInt], Typ[Int], true},
1841 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), true},
1842 {NewSlice(Typ[Int]), NewArray(Typ[Uint], 10), false},
1843 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1844 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1845 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1846 {Typ[UntypedString], Typ[String], true},
1848 if got := ConvertibleTo(test.v, test.t); got != test.want {
1849 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1854 func TestAssignableTo(t *testing.T) {
1855 for _, test := range []struct {
1859 {Typ[Int], Typ[Int], true},
1860 {Typ[Int], Typ[Float32], false},
1861 {newDefined(Typ[Int]), Typ[Int], false},
1862 {newDefined(new(Struct)), new(Struct), true},
1863 {Typ[UntypedBool], Typ[Bool], true},
1864 {Typ[UntypedString], Typ[Bool], false},
1865 // Neither untyped string nor untyped numeric assignments arise during
1866 // normal type checking, so the below behavior is technically undefined by
1868 {Typ[UntypedString], Typ[String], true},
1869 {Typ[UntypedInt], Typ[Int], true},
1871 if got := AssignableTo(test.v, test.t); got != test.want {
1872 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1877 func TestIdentical(t *testing.T) {
1878 // For each test, we compare the types of objects X and Y in the source.
1884 {"var X int; var Y int", true},
1885 {"var X int; var Y string", false},
1887 // TODO: add more tests for complex types.
1890 {"type X int; type Y int", false},
1893 {"type X = int; type Y = int", true},
1896 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1897 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1898 {`func X(int) string { return "" }; func Y(int) {}`, false},
1900 // Generic functions. Type parameters should be considered identical modulo
1901 // renaming. See also issue #49722.
1902 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1903 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1904 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1905 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1906 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1907 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1910 for _, test := range tests {
1911 pkg := mustTypecheck("test", "package p;"+test.src, nil, nil)
1912 X := pkg.Scope().Lookup("X")
1913 Y := pkg.Scope().Lookup("Y")
1914 if X == nil || Y == nil {
1915 t.Fatal("test must declare both X and Y")
1917 if got := Identical(X.Type(), Y.Type()); got != test.want {
1918 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1923 func TestIdentical_issue15173(t *testing.T) {
1924 // Identical should allow nil arguments and be symmetric.
1925 for _, test := range []struct {
1929 {Typ[Int], Typ[Int], true},
1930 {Typ[Int], nil, false},
1931 {nil, Typ[Int], false},
1934 if got := Identical(test.x, test.y); got != test.want {
1935 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1940 func TestIdenticalUnions(t *testing.T) {
1941 tname := NewTypeName(nopos, nil, "myInt", nil)
1942 myInt := NewNamed(tname, Typ[Int], nil)
1943 tmap := map[string]*Term{
1944 "int": NewTerm(false, Typ[Int]),
1945 "~int": NewTerm(true, Typ[Int]),
1946 "string": NewTerm(false, Typ[String]),
1947 "~string": NewTerm(true, Typ[String]),
1948 "myInt": NewTerm(false, myInt),
1950 makeUnion := func(s string) *Union {
1951 parts := strings.Split(s, "|")
1953 for _, p := range parts {
1956 t.Fatalf("missing term %q", p)
1958 terms = append(terms, term)
1960 return NewUnion(terms)
1962 for _, test := range []struct {
1966 // These tests are just sanity checks. The tests for type sets and
1967 // interfaces provide much more test coverage.
1968 {"int|~int", "~int", true},
1969 {"myInt|~int", "~int", true},
1970 {"int|string", "string|int", true},
1971 {"int|int|string", "string|int", true},
1972 {"myInt|string", "int|string", false},
1974 x := makeUnion(test.x)
1975 y := makeUnion(test.y)
1976 if got := Identical(x, y); got != test.want {
1977 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1982 func TestIssue15305(t *testing.T) {
1983 const src = "package p; func f() int16; var _ = f(undef)"
1984 fset := token.NewFileSet()
1985 f := mustParse(fset, "issue15305.go", src)
1987 Error: func(err error) {}, // allow errors
1990 Types: make(map[ast.Expr]TypeAndValue),
1992 conf.Check("p", fset, []*ast.File{f}, info) // ignore result
1993 for e, tv := range info.Types {
1994 if _, ok := e.(*ast.CallExpr); ok {
1995 if tv.Type != Typ[Int16] {
1996 t.Errorf("CallExpr has type %v, want int16", tv.Type)
2001 t.Errorf("CallExpr has no type")
2004 // TestCompositeLitTypes verifies that Info.Types registers the correct
2005 // types for composite literal expressions and composite literal type
2007 func TestCompositeLitTypes(t *testing.T) {
2008 for _, test := range []struct {
2011 {`[16]byte{}`, `[16]byte`},
2012 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
2013 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
2014 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
2015 {`[]int{}`, `[]int`},
2016 {`map[string]bool{"foo": true}`, `map[string]bool`},
2017 {`struct{}{}`, `struct{}`},
2018 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
2020 fset := token.NewFileSet()
2021 f := mustParse(fset, test.lit, "package p; var _ = "+test.lit)
2022 types := make(map[ast.Expr]TypeAndValue)
2023 if _, err := new(Config).Check("p", fset, []*ast.File{f}, &Info{Types: types}); err != nil {
2024 t.Fatalf("%s: %v", test.lit, err)
2027 cmptype := func(x ast.Expr, want string) {
2030 t.Errorf("%s: no Types entry found", test.lit)
2034 t.Errorf("%s: type is nil", test.lit)
2037 if got := tv.Type.String(); got != want {
2038 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2042 // test type of composite literal expression
2043 rhs := f.Decls[0].(*ast.GenDecl).Specs[0].(*ast.ValueSpec).Values[0]
2044 cmptype(rhs, test.typ)
2046 // test type of composite literal type expression
2047 cmptype(rhs.(*ast.CompositeLit).Type, test.typ)
2051 // TestObjectParents verifies that objects have parent scopes or not
2052 // as specified by the Object interface.
2053 func TestObjectParents(t *testing.T) {
2072 func f(x int) { y := x; print(y) }
2075 fset := token.NewFileSet()
2076 f := mustParse(fset, "src", src)
2079 Defs: make(map[*ast.Ident]Object),
2081 if _, err := new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
2085 for ident, obj := range info.Defs {
2087 // only package names and implicit vars have a nil object
2088 // (in this test we only need to handle the package name)
2089 if ident.Name != "p" {
2090 t.Errorf("%v has nil object", ident)
2095 // struct fields, type-associated and interface methods
2096 // have no parent scope
2098 switch obj := obj.(type) {
2104 if obj.Type().(*Signature).Recv() != nil { // method
2109 gotParent := obj.Parent() != nil
2111 case gotParent && !wantParent:
2112 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2113 case !gotParent && wantParent:
2114 t.Errorf("%v: no parent found", ident)
2119 // TestFailedImport tests that we don't get follow-on errors
2120 // elsewhere in a package due to failing to import a package.
2121 func TestFailedImport(t *testing.T) {
2122 testenv.MustHaveGoBuild(t)
2127 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2132 func f(x T) T { return foo.F(x) }
2134 fset := token.NewFileSet()
2135 f := mustParse(fset, "src", src)
2136 files := []*ast.File{f}
2138 // type-check using all possible importers
2139 for _, compiler := range []string{"gc", "gccgo", "source"} {
2142 Error: func(err error) {
2143 // we should only see the import error
2144 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2145 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2149 Importer: importer.For(compiler, nil),
2153 Uses: make(map[*ast.Ident]Object),
2155 pkg, _ := conf.Check("p", fset, files, info)
2157 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2161 imports := pkg.Imports()
2162 if len(imports) != 1 {
2163 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2167 if imp.Name() != "foo" {
2168 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2172 // verify that all uses of foo refer to the imported package foo (imp)
2173 for ident, obj := range info.Uses {
2174 if ident.Name == "foo" {
2175 if obj, ok := obj.(*PkgName); ok {
2176 if obj.Imported() != imp {
2177 t.Errorf("%s resolved to %v; want %v", ident, obj.Imported(), imp)
2180 t.Errorf("%s resolved to %v; want package name", ident, obj)
2187 func TestInstantiate(t *testing.T) {
2188 // eventually we like more tests but this is a start
2189 const src = "package p; type T[P any] *T[P]"
2190 pkg := mustTypecheck(".", src, nil, nil)
2192 // type T should have one type parameter
2193 T := pkg.Scope().Lookup("T").Type().(*Named)
2194 if n := T.TypeParams().Len(); n != 1 {
2195 t.Fatalf("expected 1 type parameter; found %d", n)
2198 // instantiation should succeed (no endless recursion)
2199 // even with a nil *Checker
2200 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2205 // instantiated type should point to itself
2206 if p := res.Underlying().(*Pointer).Elem(); p != res {
2207 t.Fatalf("unexpected result type: %s points to %s", res, p)
2211 func TestInstantiateErrors(t *testing.T) {
2213 src string // by convention, T must be the type being instantiated
2215 wantAt int // -1 indicates no error
2217 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2218 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2219 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2220 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2223 for _, test := range tests {
2224 src := "package p; " + test.src
2225 pkg := mustTypecheck(".", src, nil, nil)
2227 T := pkg.Scope().Lookup("T").Type().(*Named)
2229 _, err := Instantiate(nil, T, test.targs, true)
2231 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2234 var argErr *ArgumentError
2235 if !errors.As(err, &argErr) {
2236 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2239 if argErr.Index != test.wantAt {
2240 t.Errorf("Instantiate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2245 func TestArgumentErrorUnwrapping(t *testing.T) {
2246 var err error = &ArgumentError{
2248 Err: Error{Msg: "test"},
2251 if !errors.As(err, &e) {
2252 t.Fatalf("error %v does not wrap types.Error", err)
2254 if e.Msg != "test" {
2255 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2259 func TestInstanceIdentity(t *testing.T) {
2260 imports := make(testImporter)
2261 conf := Config{Importer: imports}
2262 makePkg := func(src string) {
2263 fset := token.NewFileSet()
2264 f := mustParse(fset, "", src)
2266 pkg, err := conf.Check(name, fset, []*ast.File{f}, nil)
2272 makePkg(`package lib; type T[P any] struct{}`)
2273 makePkg(`package a; import "lib"; var A lib.T[int]`)
2274 makePkg(`package b; import "lib"; var B lib.T[int]`)
2275 a := imports["a"].Scope().Lookup("A")
2276 b := imports["b"].Scope().Lookup("B")
2277 if !Identical(a.Type(), b.Type()) {
2278 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2282 // TestInstantiatedObjects verifies properties of instantiated objects.
2283 func TestInstantiatedObjects(t *testing.T) {
2287 type T[P any] struct {
2291 func (recv *T[Q]) concreteMethod(mParam Q) (mResult Q) { return }
2293 type FT[P any] func(ftParam P) (ftResult P)
2295 func F[P any](fParam P) (fResult P){ return }
2297 type I[P any] interface {
2303 func (R[P]) m() {} // having a method triggers expansion of R
2318 Defs: make(map[*ast.Ident]Object),
2320 fset := token.NewFileSet()
2321 f := mustParse(fset, "p.go", src)
2323 pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
2328 lookup := func(name string) Type { return pkg.Scope().Lookup(name).Type() }
2329 fnScope := pkg.Scope().Lookup("fn").(*Func).Scope()
2336 {"field", lookup("t").Underlying().(*Struct).Field(0)},
2337 {"field", fnScope.Lookup("r").Type().Underlying().(*Struct).Field(0)},
2339 // Methods and method fields
2340 {"concreteMethod", lookup("t").(*Named).Method(0)},
2341 {"recv", lookup("t").(*Named).Method(0).Type().(*Signature).Recv()},
2342 {"mParam", lookup("t").(*Named).Method(0).Type().(*Signature).Params().At(0)},
2343 {"mResult", lookup("t").(*Named).Method(0).Type().(*Signature).Results().At(0)},
2345 // Interface methods
2346 {"interfaceMethod", lookup("i").Underlying().(*Interface).Method(0)},
2348 // Function type fields
2349 {"ftParam", lookup("ft").Underlying().(*Signature).Params().At(0)},
2350 {"ftResult", lookup("ft").Underlying().(*Signature).Results().At(0)},
2353 {"fParam", lookup("f").(*Signature).Params().At(0)},
2354 {"fResult", lookup("f").(*Signature).Results().At(0)},
2357 // Collect all identifiers by name.
2358 idents := make(map[string][]*ast.Ident)
2359 ast.Inspect(f, func(n ast.Node) bool {
2360 if id, ok := n.(*ast.Ident); ok {
2361 idents[id.Name] = append(idents[id.Name], id)
2366 for _, test := range tests {
2368 t.Run(test.name, func(t *testing.T) {
2369 if got := len(idents[test.name]); got != 1 {
2370 t.Fatalf("found %d identifiers named %s, want 1", got, test.name)
2372 ident := idents[test.name][0]
2373 def := info.Defs[ident]
2374 if def == test.obj {
2375 t.Fatalf("info.Defs[%s] contains the test object", test.name)
2377 if orig := originObject(test.obj); def != orig {
2378 t.Errorf("info.Defs[%s] does not match obj.Origin()", test.name)
2380 if def.Pkg() != test.obj.Pkg() {
2381 t.Errorf("Pkg() = %v, want %v", def.Pkg(), test.obj.Pkg())
2383 if def.Name() != test.obj.Name() {
2384 t.Errorf("Name() = %v, want %v", def.Name(), test.obj.Name())
2386 if def.Pos() != test.obj.Pos() {
2387 t.Errorf("Pos() = %v, want %v", def.Pos(), test.obj.Pos())
2389 if def.Parent() != test.obj.Parent() {
2390 t.Fatalf("Parent() = %v, want %v", def.Parent(), test.obj.Parent())
2392 if def.Exported() != test.obj.Exported() {
2393 t.Fatalf("Exported() = %v, want %v", def.Exported(), test.obj.Exported())
2395 if def.Id() != test.obj.Id() {
2396 t.Fatalf("Id() = %v, want %v", def.Id(), test.obj.Id())
2398 // String and Type are expected to differ.
2403 func originObject(obj Object) Object {
2404 switch obj := obj.(type) {
2413 func TestImplements(t *testing.T) {
2417 type EmptyIface interface{}
2428 type Integer interface{
2429 int8 | int16 | int32 | int64
2432 type EmptyTypeSet interface{
2449 type Bad Bad // invalid type
2452 fset := token.NewFileSet()
2453 f := mustParse(fset, "p.go", src)
2454 conf := Config{Error: func(error) {}}
2455 pkg, _ := conf.Check(f.Name.Name, fset, []*ast.File{f}, nil)
2457 lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
2459 EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
2460 I = lookup("I").(*Named)
2461 II = I.Underlying().(*Interface)
2462 C = lookup("C").(*Named)
2463 CI = C.Underlying().(*Interface)
2464 Integer = lookup("Integer").Underlying().(*Interface)
2465 EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
2467 N1p = NewPointer(N1)
2469 N2p = NewPointer(N2)
2484 {Typ[Int8], Integer, true},
2485 {Typ[Int64], Integer, true},
2486 {Typ[String], Integer, false},
2487 {EmptyTypeSet, II, true},
2488 {EmptyTypeSet, EmptyTypeSet, true},
2489 {Typ[Int], EmptyTypeSet, false},
2504 {Bad, EmptyIface, true},
2507 for _, test := range tests {
2508 if got := Implements(test.V, test.T); got != test.want {
2509 t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
2512 // The type assertion x.(T) is valid if T is an interface or if T implements the type of x.
2513 // The assertion is never valid if T is a bad type.
2517 if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
2520 if got := AssertableTo(V, T); got != want {
2521 t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
2526 func TestMissingMethodAlternative(t *testing.T) {
2548 pkg := mustTypecheck("p.go", src, nil, nil)
2550 T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
2551 lookup := func(name string) (*Func, bool) {
2552 return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
2555 // V0 has method m with correct signature. Should not report wrongType.
2556 method, wrongType := lookup("V0")
2557 if method != nil || wrongType {
2558 t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
2561 checkMissingMethod := func(tname string, reportWrongType bool) {
2562 method, wrongType := lookup(tname)
2563 if method == nil || method.Name() != "m" || wrongType != reportWrongType {
2564 t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
2568 // V1 has no method m. Should not report wrongType.
2569 checkMissingMethod("V1", false)
2571 // V2 has method m with wrong signature type (ignoring receiver). Should report wrongType.
2572 checkMissingMethod("V2", true)
2574 // V3 has no method m but it exists on *V3. Should report wrongType.
2575 checkMissingMethod("V3", true)
2577 // V4 has no method m but has M. Should not report wrongType.
2578 checkMissingMethod("V4", false)