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.
9 "cmd/compile/internal/syntax"
18 . "cmd/compile/internal/types2"
21 // brokenPkg is a source prefix for packages that are not expected to parse
22 // or type-check cleanly. They are always parsed assuming that they contain
24 const brokenPkg = "package broken_"
26 func parseSrc(path, src string) (*syntax.File, error) {
27 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
28 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, syntax.AllowGenerics|syntax.AllowMethodTypeParams)
31 func pkgFor(path, source string, info *Info) (*Package, error) {
32 f, err := parseSrc(path, source)
36 conf := Config{Importer: defaultImporter()}
37 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
40 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
41 pkg, err := pkgFor(path, source, info)
45 name = "package " + pkg.Name()
47 t.Fatalf("%s: didn't type-check (%s)", name, err)
52 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
53 f, err := parseSrc(path, source)
54 if f == nil { // ignore errors unless f is nil
55 t.Fatalf("%s: unable to parse: %s", path, err)
58 Error: func(err error) {},
59 Importer: defaultImporter(),
61 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
62 return pkg.Name(), err
65 func TestValuesInfo(t *testing.T) {
66 var tests = []struct {
68 expr string // constant expression
69 typ string // constant type
70 val string // constant value
72 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
73 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
74 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
75 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
76 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
77 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
79 {`package b0; var _ = false`, `false`, `bool`, `false`},
80 {`package b1; var _ = 0`, `0`, `int`, `0`},
81 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
82 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
83 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
84 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
86 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
87 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
88 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
90 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
91 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
92 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
94 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
95 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
96 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
98 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
99 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
100 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
102 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
103 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
104 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
106 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
107 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
108 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
109 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
110 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
111 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
113 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
114 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
115 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
116 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
118 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
119 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
120 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
121 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
122 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
123 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
124 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
125 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
127 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
128 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
129 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
130 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
131 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
132 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
133 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
134 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
135 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
136 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
140 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
141 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
144 for _, test := range tests {
146 Types: make(map[syntax.Expr]TypeAndValue),
148 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
150 // look for expression
152 for e := range info.Types {
153 if syntax.String(e) == test.expr {
159 t.Errorf("package %s: no expression found for %s", name, test.expr)
162 tv := info.Types[expr]
164 // check that type is correct
165 if got := tv.Type.String(); got != test.typ {
166 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
170 // if we have a constant, check that value is correct
172 if got := tv.Value.ExactString(); got != test.val {
173 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
177 t.Errorf("package %s: no constant found; want %s", name, test.val)
183 func TestTypesInfo(t *testing.T) {
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`, `*int`},
198 {`package n1; var _ func() = nil`, `nil`, `func()`},
199 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
200 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
201 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
202 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
203 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
204 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
206 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
207 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
208 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
209 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
210 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
211 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
212 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
213 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
215 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
216 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
217 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
218 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
219 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
220 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
221 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
222 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
224 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
225 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
226 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
227 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
228 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
229 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
230 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
231 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
233 // comma-ok expressions
234 {`package p0; var x interface{}; var _, _ = x.(int)`,
238 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
242 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
244 `(complex128, p2a.mybool)`,
246 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
248 `(complex128, bool)`,
250 {`package p3; var c chan string; var _, _ = <-c`,
256 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
260 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
264 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
268 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
272 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
278 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
282 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
286 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
290 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
294 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
298 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
304 {`package issue28277_a; func f(...int)`,
308 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
313 // tests for broken code that doesn't parse or type-check
314 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
315 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
316 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
317 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
318 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
319 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
321 // parameterized functions
322 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
323 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
324 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
325 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
326 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
327 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
330 {`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
331 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
332 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
333 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
334 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
336 // instantiated types must be sanitized
337 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
340 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
343 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
346 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
347 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
348 {`package u2a; func _[_ interface{int|string}]() {}`, `int | string`, `int|string`},
349 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string | ~bool`, `int|string|~bool`},
350 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string`, `int|string`},
351 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `~bool`, `~bool`},
352 {`package u3a; func _[_ interface{int|string|~float64|~bool}]() {}`, `int | string | ~float64`, `int|string|~float64`},
354 {`package u0b; func _[_ int]() {}`, `int`, `int`},
355 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
356 {`package u2b; func _[_ int|string]() {}`, `int | string`, `int|string`},
357 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string | ~bool`, `int|string|~bool`},
358 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string`, `int|string`},
359 {`package u3b; func _[_ int|string|~bool]() {}`, `~bool`, `~bool`},
360 {`package u3b; func _[_ int|string|~float64|~bool]() {}`, `int | string | ~float64`, `int|string|~float64`},
362 {`package u0c; type _ interface{int}`, `int`, `int`},
363 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
364 {`package u2c; type _ interface{int|string}`, `int | string`, `int|string`},
365 {`package u3c; type _ interface{int|string|~bool}`, `int | string | ~bool`, `int|string|~bool`},
366 {`package u3c; type _ interface{int|string|~bool}`, `int | string`, `int|string`},
367 {`package u3c; type _ interface{int|string|~bool}`, `~bool`, `~bool`},
368 {`package u3c; type _ interface{int|string|~float64|~bool}`, `int | string | ~float64`, `int|string|~float64`},
371 for _, test := range tests {
372 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
374 if strings.HasPrefix(test.src, brokenPkg) {
376 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
378 t.Errorf("package %s: expected to fail but passed", name)
382 name = mustTypecheck(t, "TypesInfo", test.src, &info)
385 // look for expression type
387 for e, tv := range info.Types {
388 if syntax.String(e) == test.expr {
394 t.Errorf("package %s: no type found for %s", name, test.expr)
398 // check that type is correct
399 if got := typ.String(); got != test.typ {
400 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
405 func TestInstanceInfo(t *testing.T) {
406 var tests = []struct {
412 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
417 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
422 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
424 []string{`complex128`},
425 `func(...complex128) complex128`,
427 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
429 []string{`float64`, `string`, `byte`},
430 `func(float64, *string, []byte)`,
432 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
434 []string{`float64`, `byte`},
435 `func(float64, *byte, ...[]byte)`,
438 // we don't know how to translate these but we can type-check them
439 {`package q0; type T struct{}; func (T) m[P any](P) {}; func _(x T) { x.m(42) }`,
444 {`package q1; type T struct{}; func (T) m[P any](P) P { panic(0) }; func _(x T) { x.m(42) }`,
449 {`package q2; type T struct{}; func (T) m[P any](...P) P { panic(0) }; func _(x T) { x.m(42) }`,
454 {`package q3; type T struct{}; func (T) m[A, B, C any](A, *B, []C) {}; func _(x T) { x.m(1.2, new(string), []byte{}) }`,
456 []string{`float64`, `string`, `byte`},
457 `func(float64, *string, []byte)`,
459 {`package q4; type T struct{}; func (T) m[A, B any](A, *B, ...[]B) {}; func _(x T) { x.m(1.2, new(byte)) }`,
461 []string{`float64`, `byte`},
462 `func(float64, *byte, ...[]byte)`,
465 {`package r0; type T[P any] struct{}; func (_ T[P]) m[Q any](Q) {}; func _[P any](x T[P]) { x.m(42) }`,
470 // TODO(gri) record method type parameters in syntax.FuncType so we can check this
471 // {`package r1; type T interface{ m[P any](P) }; func _(x T) { x.m(4.2) }`,
473 // []string{`float64`},
477 {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
479 []string{`string`, `*string`},
482 {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
484 []string{`int`, `*int`},
487 {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
489 []string{`int`, `chan<- int`},
492 {`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) }`,
494 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
498 {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
500 []string{`string`, `*string`},
503 {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
505 []string{`string`, `*string`},
508 {`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] }`,
510 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
513 {`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]) }`,
515 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
519 {`package i0; import "lib"; func _() { lib.F(42) }`,
525 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
530 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
535 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
540 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
542 []string{`[]int`, `int`},
543 `struct{x []int; y int}`,
545 {`package type4; import "lib"; var _ lib.T[int]`,
552 for _, test := range tests {
553 const lib = `package lib
560 imports := make(testImporter)
561 conf := Config{Importer: imports}
562 instances := make(map[*syntax.Name]Instance)
563 uses := make(map[*syntax.Name]Object)
564 makePkg := func(src string) *Package {
565 f, err := parseSrc("p.go", src)
569 pkg, err := conf.Check("", []*syntax.File{f}, &Info{Instances: instances, Uses: uses})
573 imports[pkg.Name()] = pkg
577 pkg := makePkg(test.src)
579 // look for instance information
582 for ident, inst := range instances {
583 if syntax.String(ident) == test.name {
584 for i := 0; i < inst.TypeArgs.Len(); i++ {
585 targs = append(targs, inst.TypeArgs.At(i))
589 // Check that we can find the corresponding parameterized type.
590 ptype := uses[ident].Type()
591 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
592 if lister == nil || lister.TypeParams().Len() == 0 {
593 t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
597 // Verify the invariant that re-instantiating the generic type with
598 // TypeArgs results in an equivalent type.
599 inst2, err := Instantiate(nil, ptype, targs, true)
601 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
603 if !Identical(inst.Type, inst2) {
604 t.Errorf("%v and %v are not identical", inst.Type, inst2)
610 t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
614 // check that type arguments are correct
615 if len(targs) != len(test.targs) {
616 t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
619 for i, targ := range targs {
620 if got := targ.String(); got != test.targs[i] {
621 t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
626 // check that the types match
627 if got := typ.Underlying().String(); got != test.typ {
628 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, test.typ)
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[*syntax.Name]Object),
656 name := mustTypecheck(t, "DefsInfo", test.src, &info)
660 for id, obj := range info.Defs {
661 if id.Value == 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()`,
717 for _, test := range tests {
719 Uses: make(map[*syntax.Name]Object),
721 name := mustTypecheck(t, "UsesInfo", test.src, &info)
725 for id, obj := range info.Uses {
726 if id.Value == test.obj {
728 panic(fmt.Sprintf("multiple uses of %q", id.Value))
734 t.Errorf("package %s: %s not found", name, test.obj)
738 if got := use.String(); got != test.want {
739 t.Errorf("package %s: got %s; want %s", name, got, test.want)
744 func TestGenericMethodInfo(t *testing.T) {
749 func (r N[B]) m() { r.m(); r.n() }
751 func (r *N[C]) n() { }
753 f, err := parseSrc("p.go", src)
758 Defs: make(map[*syntax.Name]Object),
759 Uses: make(map[*syntax.Name]Object),
760 Selections: make(map[*syntax.SelectorExpr]*Selection),
763 pkg, err := conf.Check("p", []*syntax.File{f}, &info)
768 N := pkg.Scope().Lookup("N").Type().(*Named)
770 // Find the generic methods stored on N.
771 gm, gn := N.Method(0), N.Method(1)
772 if gm.Name() == "n" {
776 // Collect objects from info.
777 var dm, dn *Func // the declared methods
778 var dmm, dmn *Func // the methods used in the body of m
779 for _, decl := range f.DeclList {
780 fdecl, ok := decl.(*syntax.FuncDecl)
784 def := info.Defs[fdecl.Name].(*Func)
785 switch fdecl.Name.Value {
788 syntax.Inspect(fdecl.Body, func(n syntax.Node) bool {
789 if call, ok := n.(*syntax.CallExpr); ok {
790 sel := call.Fun.(*syntax.SelectorExpr)
791 use := info.Uses[sel.Sel].(*Func)
792 selection := info.Selections[sel]
793 if selection.Kind() != MethodVal {
794 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
796 if selection.Obj() != use {
797 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
799 switch sel.Sel.Value {
814 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
817 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
820 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
823 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
827 func TestImplicitsInfo(t *testing.T) {
828 testenv.MustHaveGoBuild(t)
830 var tests = []struct {
834 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
835 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
836 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
838 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
839 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
840 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
841 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
843 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
844 {`package p8; func f(int) {}`, "field: var int"},
845 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
846 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
848 // Tests using generics.
849 {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
850 {`package f1; func f[T any](int) {}`, "field: var int"},
851 {`package f2; func f[T any](T) {}`, "field: var T"},
852 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
853 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
854 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
855 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
856 {`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]"},
857 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
860 for _, test := range tests {
862 Implicits: make(map[syntax.Node]Object),
864 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
866 // the test cases expect at most one Implicits entry
867 if len(info.Implicits) > 1 {
868 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
872 // extract Implicits entry, if any
874 for n, obj := range info.Implicits {
875 switch x := n.(type) {
876 case *syntax.ImportDecl:
878 case *syntax.CaseClause:
883 t.Fatalf("package %s: unexpected %T", name, x)
885 got += ": " + obj.String()
889 if got != test.want {
890 t.Errorf("package %s: got %q; want %q", name, got, test.want)
895 func predString(tv TypeAndValue) string {
897 pred := func(b bool, s string) {
900 buf.WriteString(", ")
906 pred(tv.IsVoid(), "void")
907 pred(tv.IsType(), "type")
908 pred(tv.IsBuiltin(), "builtin")
909 pred(tv.IsValue() && tv.Value != nil, "const")
910 pred(tv.IsValue() && tv.Value == nil, "value")
911 pred(tv.IsNil(), "nil")
912 pred(tv.Addressable(), "addressable")
913 pred(tv.Assignable(), "assignable")
914 pred(tv.HasOk(), "hasOk")
922 func TestPredicatesInfo(t *testing.T) {
923 testenv.MustHaveGoBuild(t)
925 var tests = []struct {
931 {`package n0; func f() { f() }`, `f()`, `void`},
934 {`package t0; type _ int`, `int`, `type`},
935 {`package t1; type _ []int`, `[]int`, `type`},
936 {`package t2; type _ func()`, `func()`, `type`},
937 {`package t3; type _ func(int)`, `int`, `type`},
938 {`package t3; type _ func(...int)`, `...int`, `type`},
941 {`package b0; var _ = len("")`, `len`, `builtin`},
942 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
945 {`package c0; var _ = 42`, `42`, `const`},
946 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
947 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
950 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
951 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
952 {`package v2; var _ = func(){}`, `func() {}`, `value`},
953 {`package v4; func f() { _ = f }`, `f`, `value`},
954 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
955 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
957 // addressable (and thus assignable) operands
958 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
959 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
960 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
961 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
962 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
963 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
964 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
965 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
966 // composite literals are not addressable
968 // assignable but not addressable values
969 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
970 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
973 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
974 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
977 // - package names are collected in the Uses map
978 // - identifiers being declared are collected in the Defs map
979 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
980 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
981 {`package m2; const c = 0`, `c`, `<missing>`},
982 {`package m3; type T int`, `T`, `<missing>`},
983 {`package m4; var v int`, `v`, `<missing>`},
984 {`package m5; func f() {}`, `f`, `<missing>`},
985 {`package m6; func _(x int) {}`, `x`, `<missing>`},
986 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
987 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
990 for _, test := range tests {
991 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
992 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
994 // look for expression predicates
996 for e, tv := range info.Types {
997 //println(name, syntax.String(e))
998 if syntax.String(e) == test.expr {
1004 if got != test.pred {
1005 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
1010 func TestScopesInfo(t *testing.T) {
1011 testenv.MustHaveGoBuild(t)
1013 var tests = []struct {
1015 scopes []string // list of scope descriptors of the form kind:varlist
1017 {`package p0`, []string{
1020 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1023 {`package p2; func _() {}`, []string{
1026 {`package p3; func _(x, y int) {}`, []string{
1027 "file:", "func:x y",
1029 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1030 "file:", "func:x y z", // redeclaration of x
1032 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1033 "file:", "func:u x y",
1035 {`package p6; func _() { { var x int; _ = x } }`, []string{
1036 "file:", "func:", "block:x",
1038 {`package p7; func _() { if true {} }`, []string{
1039 "file:", "func:", "if:", "block:",
1041 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1042 "file:", "func:", "if:x", "block:y",
1044 {`package p9; func _() { switch x := 0; x {} }`, []string{
1045 "file:", "func:", "switch:x",
1047 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1048 "file:", "func:", "switch:x", "case:y", "case:",
1050 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1051 "file:", "func:t", "switch:",
1053 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1054 "file:", "func:t", "switch:t",
1056 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1057 "file:", "func:t", "switch:", "case:x", // x implicitly declared
1059 {`package p14; func _() { select{} }`, []string{
1062 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1063 "file:", "func:c", "comm:",
1065 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1066 "file:", "func:c", "comm:i x",
1068 {`package p17; func _() { for{} }`, []string{
1069 "file:", "func:", "for:", "block:",
1071 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1072 "file:", "func:n", "for:i", "block:",
1074 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1075 "file:", "func:a", "for:i", "block:",
1077 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1078 "file:", "func:a", "for:i x", "block:",
1082 for _, test := range tests {
1083 info := Info{Scopes: make(map[syntax.Node]*Scope)}
1084 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
1086 // number of scopes must match
1087 if len(info.Scopes) != len(test.scopes) {
1088 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1091 // scope descriptions must match
1092 for node, scope := range info.Scopes {
1094 switch node.(type) {
1097 case *syntax.FuncType:
1099 case *syntax.BlockStmt:
1101 case *syntax.IfStmt:
1103 case *syntax.SwitchStmt:
1105 case *syntax.SelectStmt:
1107 case *syntax.CaseClause:
1109 case *syntax.CommClause:
1111 case *syntax.ForStmt:
1114 kind = fmt.Sprintf("%T", node)
1117 // look for matching scope description
1118 desc := kind + ":" + strings.Join(scope.Names(), " ")
1120 for _, d := range test.scopes {
1127 t.Errorf("package %s: no matching scope found for %s", name, desc)
1133 func TestInitOrderInfo(t *testing.T) {
1134 var tests = []struct {
1138 {`package p0; var (x = 1; y = x)`, []string{
1141 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1142 "a = 1", "b = 2", "c = 3",
1144 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1145 "a = 1", "b = 2", "c = 3",
1147 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1148 "_ = f()", // blank var
1150 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1151 "a = 0", "z = 0", "y = z", "x = y",
1153 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1154 "a, _ = m[0]", // blank var
1156 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1157 "z = 0", "a, b = f()",
1159 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1160 "b = 1", "a = func() int {…}()",
1162 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1163 "c = 1", "a, b = func() (_, _ int) {…}()",
1165 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1168 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1169 "a = 0", "b = 0", "c = 0", "d = c + b",
1171 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1172 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1174 // emit an initializer for n:1 initializations only once (not for each node
1175 // on the lhs which may appear in different order in the dependency graph)
1176 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1177 "b = 0", "x, y = m[0]", "a = x",
1179 // test case from spec section on package initialization
1193 "d = 3", "b = f()", "c = f()", "a = c + b",
1195 // test case for issue 7131
1199 func next() int { counter++; return counter }
1202 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1205 var b, c = next(), next()
1206 var d, e, f = next(), next(), next()
1208 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1210 // test case for issue 10709
1220 func (T) m() int { return 0 }
1222 func makeT(n int) T {
1228 "t = makeT(0)", "v = t.m()",
1230 // test case for issue 10709: same as test before, but variable decls swapped
1240 func (T) m() int { return 0 }
1242 func makeT(n int) T {
1248 "t = makeT(0)", "v = t.m()",
1250 // another candidate possibly causing problems with issue 10709
1255 func f1() int { return g1() }
1256 func g1() int { f1(); return x1 }
1262 func f2() int { return g2() }
1263 func g2() int { return x2 }
1265 var x2 = 0`, []string{
1266 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1270 for _, test := range tests {
1272 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1274 // number of initializers must match
1275 if len(info.InitOrder) != len(test.inits) {
1276 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1280 // initializers must match
1281 for i, want := range test.inits {
1282 got := info.InitOrder[i].String()
1284 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1291 func TestMultiFileInitOrder(t *testing.T) {
1292 mustParse := func(src string) *syntax.File {
1293 f, err := parseSrc("main", src)
1300 fileA := mustParse(`package main; var a = 1`)
1301 fileB := mustParse(`package main; var b = 2`)
1303 // The initialization order must not depend on the parse
1304 // order of the files, only on the presentation order to
1305 // the type-checker.
1306 for _, test := range []struct {
1307 files []*syntax.File
1310 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1311 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1314 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1317 if got := fmt.Sprint(info.InitOrder); got != test.want {
1318 t.Fatalf("got %s; want %s", got, test.want)
1323 func TestFiles(t *testing.T) {
1324 var sources = []string{
1325 "package p; type T struct{}; func (T) m1() {}",
1326 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1327 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1332 pkg := NewPackage("p", "p")
1334 check := NewChecker(&conf, pkg, &info)
1336 for i, src := range sources {
1337 filename := fmt.Sprintf("sources%d", i)
1338 f, err := parseSrc(filename, src)
1342 if err := check.Files([]*syntax.File{f}); err != nil {
1347 // check InitOrder is [x y]
1349 for _, init := range info.InitOrder {
1350 for _, v := range init.Lhs {
1351 vars = append(vars, v.Name())
1354 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1355 t.Errorf("InitOrder == %s, want %s", got, want)
1359 type testImporter map[string]*Package
1361 func (m testImporter) Import(path string) (*Package, error) {
1362 if pkg := m[path]; pkg != nil {
1365 return nil, fmt.Errorf("package %q not found", path)
1368 func TestSelection(t *testing.T) {
1369 selections := make(map[*syntax.SelectorExpr]*Selection)
1371 imports := make(testImporter)
1372 conf := Config{Importer: imports}
1373 makePkg := func(path, src string) {
1374 f, err := parseSrc(path+".go", src)
1378 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1416 // qualified identifiers
1450 // 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]"},
1469 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1470 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1471 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1472 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1473 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1474 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1475 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1476 "C{}.g": {"method (main.C) g()", ".[0]"},
1477 "new(C).g": {"method (*main.C) g()", "->[0]"},
1478 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1480 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1481 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1482 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1483 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1486 makePkg("lib", libSrc)
1487 makePkg("main", mainSrc)
1489 for e, sel := range selections {
1490 _ = sel.String() // assertion: must not panic
1492 start := indexFor(mainSrc, syntax.StartPos(e))
1493 end := indexFor(mainSrc, syntax.EndPos(e))
1494 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1502 fmt.Sprintf("%s%v", direct, sel.Index()),
1504 want := wantOut[segment]
1506 t.Errorf("%s: got %q; want %q", segment, got, want)
1508 delete(wantOut, segment)
1510 // We must explicitly assert properties of the
1511 // Signature's receiver since it doesn't participate
1512 // in Identical() or String().
1513 sig, _ := sel.Type().(*Signature)
1514 if sel.Kind() == MethodVal {
1515 got := sig.Recv().Type()
1517 if !Identical(got, want) {
1518 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1520 } else if sig != nil && sig.Recv() != nil {
1521 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1524 // Assert that all wantOut entries were used exactly once.
1525 for segment := range wantOut {
1526 t.Errorf("no syntax.Selection found with syntax %q", segment)
1530 // indexFor returns the index into s corresponding to the position pos.
1531 func indexFor(s string, pos syntax.Pos) int {
1532 i, line := 0, 1 // string index and corresponding line
1533 target := int(pos.Line())
1534 for line < target && i < len(s) {
1540 return i + int(pos.Col()-1) // columns are 1-based
1543 func TestIssue8518(t *testing.T) {
1544 imports := make(testImporter)
1546 Error: func(err error) { t.Log(err) }, // don't exit after first error
1549 makePkg := func(path, src string) {
1550 f, err := parseSrc(path, src)
1554 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1562 const C2 = missing.C
1572 makePkg("a", libSrc)
1573 makePkg("main", mainSrc) // don't crash when type-checking this package
1576 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1577 // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
1579 const want = "LookupFieldOrMethod on nil type"
1581 if s, ok := p.(string); !ok || s != want {
1582 t.Fatalf("got %v, want %s", p, want)
1585 LookupFieldOrMethod(nil, false, nil, "")
1588 func TestLookupFieldOrMethod(t *testing.T) {
1589 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1590 // addressable value, and x for a non-addressable value (even though a variable
1591 // for ease of test case writing).
1592 var tests = []struct {
1599 {"var x T; type T struct{}", false, nil, false},
1600 {"var x T; type T struct{ f int }", true, []int{0}, false},
1601 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1604 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1605 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1606 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1607 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1610 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1611 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1613 // outside methodset
1614 // (*T).f method exists, but value of type T is not addressable
1615 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1618 for _, test := range tests {
1619 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1621 t.Errorf("%s: incorrect test case: %s", test.src, err)
1625 obj := pkg.Scope().Lookup("a")
1627 if obj = pkg.Scope().Lookup("x"); obj == nil {
1628 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1633 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1634 if (f != nil) != test.found {
1636 t.Errorf("%s: got no object; want one", test.src)
1638 t.Errorf("%s: got object = %v; want none", test.src, f)
1641 if !sameSlice(index, test.index) {
1642 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1644 if indirect != test.indirect {
1645 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1650 func sameSlice(a, b []int) bool {
1651 if len(a) != len(b) {
1654 for i, x := range a {
1662 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1663 // the correct result at various positions within the source.
1664 func TestScopeLookupParent(t *testing.T) {
1665 imports := make(testImporter)
1666 conf := Config{Importer: imports}
1668 makePkg := func(path, src string) {
1669 f, err := parseSrc(path, src)
1673 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1679 makePkg("lib", "package lib; var X int")
1680 // Each /*name=kind:line*/ comment makes the test look up the
1681 // name at that point and checks that it resolves to a decl of
1682 // the specified kind and line number. "undef" means undefined.
1684 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1695 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1696 type /*t=undef*/ t /*t=typename:14*/ *t
1697 print(Y) /*Y=var:10*/
1698 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1699 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1702 for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
1705 switch y := i.(type) { /*y=undef*/
1706 case /*y=undef*/ int /*y=var:23*/ :
1707 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1708 default /*y=var:23*/:
1713 switch int := i.(type) {
1714 case /*int=typename:0*/ int /*int=var:31*/ :
1716 default /*int=var:31*/ :
1722 info.Uses = make(map[*syntax.Name]Object)
1723 makePkg("main", mainSrc)
1724 mainScope := imports["main"].Scope()
1726 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1728 base := syntax.NewFileBase("main")
1729 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1730 pos := syntax.MakePos(base, line, col)
1732 // Syntax errors are not comments.
1734 t.Errorf("%s: %s", pos, text)
1738 // Parse the assertion in the comment.
1739 m := rx.FindStringSubmatch(text)
1741 t.Errorf("%s: bad comment: %s", pos, text)
1744 name, want := m[1], m[2]
1746 // Look up the name in the innermost enclosing scope.
1747 inner := mainScope.Innermost(pos)
1749 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1753 if _, obj := inner.LookupParent(name, pos); obj != nil {
1754 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1755 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1758 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1762 // Check that for each referring identifier,
1763 // a lookup of its name on the innermost
1764 // enclosing scope returns the correct object.
1766 for id, wantObj := range info.Uses {
1767 inner := mainScope.Innermost(id.Pos())
1769 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1773 // Exclude selectors and qualified identifiers---lexical
1774 // refs only. (Ideally, we'd see if the AST parent is a
1775 // SelectorExpr, but that requires PathEnclosingInterval
1776 // from golang.org/x/tools/go/ast/astutil.)
1777 if id.Value == "X" {
1781 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1782 if gotObj != wantObj {
1783 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1789 var nopos syntax.Pos
1791 // newDefined creates a new defined type named T with the given underlying type.
1792 func newDefined(underlying Type) *Named {
1793 tname := NewTypeName(nopos, nil, "T", nil)
1794 return NewNamed(tname, underlying, nil)
1797 func TestConvertibleTo(t *testing.T) {
1798 for _, test := range []struct {
1802 {Typ[Int], Typ[Int], true},
1803 {Typ[Int], Typ[Float32], true},
1804 {Typ[Int], Typ[String], true},
1805 {newDefined(Typ[Int]), Typ[Int], true},
1806 {newDefined(new(Struct)), new(Struct), true},
1807 {newDefined(Typ[Int]), new(Struct), false},
1808 {Typ[UntypedInt], Typ[Int], true},
1809 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1810 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1811 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1812 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1813 {Typ[UntypedString], Typ[String], true},
1815 if got := ConvertibleTo(test.v, test.t); got != test.want {
1816 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1821 func TestAssignableTo(t *testing.T) {
1822 for _, test := range []struct {
1826 {Typ[Int], Typ[Int], true},
1827 {Typ[Int], Typ[Float32], false},
1828 {newDefined(Typ[Int]), Typ[Int], false},
1829 {newDefined(new(Struct)), new(Struct), true},
1830 {Typ[UntypedBool], Typ[Bool], true},
1831 {Typ[UntypedString], Typ[Bool], false},
1832 // Neither untyped string nor untyped numeric assignments arise during
1833 // normal type checking, so the below behavior is technically undefined by
1835 {Typ[UntypedString], Typ[String], true},
1836 {Typ[UntypedInt], Typ[Int], true},
1838 if got := AssignableTo(test.v, test.t); got != test.want {
1839 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1844 func TestIdentical(t *testing.T) {
1845 // For each test, we compare the types of objects X and Y in the source.
1851 {"var X int; var Y int", true},
1852 {"var X int; var Y string", false},
1854 // TODO: add more tests for complex types.
1857 {"type X int; type Y int", false},
1860 {"type X = int; type Y = int", true},
1863 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1864 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1865 {`func X(int) string { return "" }; func Y(int) {}`, false},
1867 // Generic functions. Type parameters should be considered identical modulo
1868 // renaming. See also issue #49722.
1869 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1870 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1871 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1872 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1873 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1874 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1877 for _, test := range tests {
1878 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1880 t.Errorf("%s: incorrect test case: %s", test.src, err)
1883 X := pkg.Scope().Lookup("X")
1884 Y := pkg.Scope().Lookup("Y")
1885 if X == nil || Y == nil {
1886 t.Fatal("test must declare both X and Y")
1888 if got := Identical(X.Type(), Y.Type()); got != test.want {
1889 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1894 func TestIdentical_issue15173(t *testing.T) {
1895 // Identical should allow nil arguments and be symmetric.
1896 for _, test := range []struct {
1900 {Typ[Int], Typ[Int], true},
1901 {Typ[Int], nil, false},
1902 {nil, Typ[Int], false},
1905 if got := Identical(test.x, test.y); got != test.want {
1906 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1911 func TestIdenticalUnions(t *testing.T) {
1912 tname := NewTypeName(nopos, nil, "myInt", nil)
1913 myInt := NewNamed(tname, Typ[Int], nil)
1914 tmap := map[string]*Term{
1915 "int": NewTerm(false, Typ[Int]),
1916 "~int": NewTerm(true, Typ[Int]),
1917 "string": NewTerm(false, Typ[String]),
1918 "~string": NewTerm(true, Typ[String]),
1919 "myInt": NewTerm(false, myInt),
1921 makeUnion := func(s string) *Union {
1922 parts := strings.Split(s, "|")
1924 for _, p := range parts {
1927 t.Fatalf("missing term %q", p)
1929 terms = append(terms, term)
1931 return NewUnion(terms)
1933 for _, test := range []struct {
1937 // These tests are just sanity checks. The tests for type sets and
1938 // interfaces provide much more test coverage.
1939 {"int|~int", "~int", true},
1940 {"myInt|~int", "~int", true},
1941 {"int|string", "string|int", true},
1942 {"int|int|string", "string|int", true},
1943 {"myInt|string", "int|string", false},
1945 x := makeUnion(test.x)
1946 y := makeUnion(test.y)
1947 if got := Identical(x, y); got != test.want {
1948 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1953 func TestIssue15305(t *testing.T) {
1954 const src = "package p; func f() int16; var _ = f(undef)"
1955 f, err := parseSrc("issue15305.go", src)
1960 Error: func(err error) {}, // allow errors
1963 Types: make(map[syntax.Expr]TypeAndValue),
1965 conf.Check("p", []*syntax.File{f}, info) // ignore result
1966 for e, tv := range info.Types {
1967 if _, ok := e.(*syntax.CallExpr); ok {
1968 if tv.Type != Typ[Int16] {
1969 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1974 t.Errorf("CallExpr has no type")
1977 // TestCompositeLitTypes verifies that Info.Types registers the correct
1978 // types for composite literal expressions and composite literal type
1980 func TestCompositeLitTypes(t *testing.T) {
1981 for _, test := range []struct {
1984 {`[16]byte{}`, `[16]byte`},
1985 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1986 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1987 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1988 {`[]int{}`, `[]int`},
1989 {`map[string]bool{"foo": true}`, `map[string]bool`},
1990 {`struct{}{}`, `struct{}`},
1991 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1993 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
1995 t.Fatalf("%s: %v", test.lit, err)
1999 Types: make(map[syntax.Expr]TypeAndValue),
2001 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2002 t.Fatalf("%s: %v", test.lit, err)
2005 cmptype := func(x syntax.Expr, want string) {
2006 tv, ok := info.Types[x]
2008 t.Errorf("%s: no Types entry found", test.lit)
2012 t.Errorf("%s: type is nil", test.lit)
2015 if got := tv.Type.String(); got != want {
2016 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2020 // test type of composite literal expression
2021 rhs := f.DeclList[0].(*syntax.VarDecl).Values
2022 cmptype(rhs, test.typ)
2024 // test type of composite literal type expression
2025 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
2029 // TestObjectParents verifies that objects have parent scopes or not
2030 // as specified by the Object interface.
2031 func TestObjectParents(t *testing.T) {
2050 func f(x int) { y := x; print(y) }
2053 f, err := parseSrc("src", src)
2059 Defs: make(map[*syntax.Name]Object),
2061 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2065 for ident, obj := range info.Defs {
2067 // only package names and implicit vars have a nil object
2068 // (in this test we only need to handle the package name)
2069 if ident.Value != "p" {
2070 t.Errorf("%v has nil object", ident)
2075 // struct fields, type-associated and interface methods
2076 // have no parent scope
2078 switch obj := obj.(type) {
2084 if obj.Type().(*Signature).Recv() != nil { // method
2089 gotParent := obj.Parent() != nil
2091 case gotParent && !wantParent:
2092 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2093 case !gotParent && wantParent:
2094 t.Errorf("%v: no parent found", ident)
2099 // TestFailedImport tests that we don't get follow-on errors
2100 // elsewhere in a package due to failing to import a package.
2101 func TestFailedImport(t *testing.T) {
2102 testenv.MustHaveGoBuild(t)
2107 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2112 func f(x T) T { return foo.F(x) }
2114 f, err := parseSrc("src", src)
2118 files := []*syntax.File{f}
2120 // type-check using all possible importers
2121 for _, compiler := range []string{"gc", "gccgo", "source"} {
2124 Error: func(err error) {
2125 // we should only see the import error
2126 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2127 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2131 //Importer: importer.For(compiler, nil),
2135 Uses: make(map[*syntax.Name]Object),
2137 pkg, _ := conf.Check("p", files, info)
2139 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2143 imports := pkg.Imports()
2144 if len(imports) != 1 {
2145 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2149 if imp.Name() != "foo" {
2150 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2154 // verify that all uses of foo refer to the imported package foo (imp)
2155 for ident, obj := range info.Uses {
2156 if ident.Value == "foo" {
2157 if obj, ok := obj.(*PkgName); ok {
2158 if obj.Imported() != imp {
2159 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
2162 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
2169 func TestInstantiate(t *testing.T) {
2170 // eventually we like more tests but this is a start
2171 const src = "package p; type T[P any] *T[P]"
2172 pkg, err := pkgFor(".", src, nil)
2177 // type T should have one type parameter
2178 T := pkg.Scope().Lookup("T").Type().(*Named)
2179 if n := T.TypeParams().Len(); n != 1 {
2180 t.Fatalf("expected 1 type parameter; found %d", n)
2183 // instantiation should succeed (no endless recursion)
2184 // even with a nil *Checker
2185 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2190 // instantiated type should point to itself
2191 if p := res.Underlying().(*Pointer).Elem(); p != res {
2192 t.Fatalf("unexpected result type: %s points to %s", res, p)
2196 func TestInstantiateErrors(t *testing.T) {
2198 src string // by convention, T must be the type being instantiated
2200 wantAt int // -1 indicates no error
2202 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2203 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2204 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2205 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2208 for _, test := range tests {
2209 src := "package p; " + test.src
2210 pkg, err := pkgFor(".", src, nil)
2215 T := pkg.Scope().Lookup("T").Type().(*Named)
2217 _, err = Instantiate(nil, T, test.targs, true)
2219 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2222 var argErr *ArgumentError
2223 if !errors.As(err, &argErr) {
2224 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2227 if argErr.Index != test.wantAt {
2228 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2233 func TestArgumentErrorUnwrapping(t *testing.T) {
2234 var err error = &ArgumentError{
2236 Err: Error{Msg: "test"},
2239 if !errors.As(err, &e) {
2240 t.Fatalf("error %v does not wrap types.Error", err)
2242 if e.Msg != "test" {
2243 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2247 func TestInstanceIdentity(t *testing.T) {
2248 imports := make(testImporter)
2249 conf := Config{Importer: imports}
2250 makePkg := func(src string) {
2251 f, err := parseSrc("", src)
2255 name := f.PkgName.Value
2256 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2262 makePkg(`package lib; type T[P any] struct{}`)
2263 makePkg(`package a; import "lib"; var A lib.T[int]`)
2264 makePkg(`package b; import "lib"; var B lib.T[int]`)
2265 a := imports["a"].Scope().Lookup("A")
2266 b := imports["b"].Scope().Lookup("B")
2267 if !Identical(a.Type(), b.Type()) {
2268 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2272 func TestImplements(t *testing.T) {
2276 type EmptyIface interface{}
2287 type Integer interface{
2288 int8 | int16 | int32 | int64
2291 type EmptyTypeSet interface{
2308 type Bad Bad // invalid type
2311 f, err := parseSrc("p.go", src)
2315 conf := Config{Error: func(error) {}}
2316 pkg, _ := conf.Check(f.PkgName.Value, []*syntax.File{f}, nil)
2318 lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
2320 EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
2321 I = lookup("I").(*Named)
2322 II = I.Underlying().(*Interface)
2323 C = lookup("C").(*Named)
2324 CI = C.Underlying().(*Interface)
2325 Integer = lookup("Integer").Underlying().(*Interface)
2326 EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
2328 N1p = NewPointer(N1)
2330 N2p = NewPointer(N2)
2345 {Typ[Int8], Integer, true},
2346 {Typ[Int64], Integer, true},
2347 {Typ[String], Integer, false},
2348 {EmptyTypeSet, II, true},
2349 {EmptyTypeSet, EmptyTypeSet, true},
2350 {Typ[Int], EmptyTypeSet, false},
2365 {Bad, EmptyIface, true},
2368 for _, test := range tests {
2369 if got := Implements(test.V, test.T); got != test.want {
2370 t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
2373 // The type assertion x.(T) is valid if T is an interface or if T implements the type of x.
2374 // The assertion is never valid if T is a bad type.
2378 if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
2381 if got := AssertableTo(V, T); got != want {
2382 t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
2387 func TestMissingMethodAlternative(t *testing.T) {
2409 pkg, err := pkgFor("p.go", src, nil)
2414 T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
2415 lookup := func(name string) (*Func, bool) {
2416 return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
2419 // V0 has method m with correct signature. Should not report wrongType.
2420 method, wrongType := lookup("V0")
2421 if method != nil || wrongType {
2422 t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
2425 checkMissingMethod := func(tname string, reportWrongType bool) {
2426 method, wrongType := lookup(tname)
2427 if method == nil || method.Name() != "m" || wrongType != reportWrongType {
2428 t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
2432 // V1 has no method m. Should not report wrongType.
2433 checkMissingMethod("V1", false)
2435 // V2 has method m with wrong signature type (ignoring receiver). Should report wrongType.
2436 checkMissingMethod("V2", true)
2438 // V3 has no method m but it exists on *V3. Should report wrongType.
2439 checkMissingMethod("V3", true)
2441 // V4 has no method m but has M. Should not report wrongType.
2442 checkMissingMethod("V4", false)