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"
19 . "cmd/compile/internal/types2"
22 // brokenPkg is a source prefix for packages that are not expected to parse
23 // or type-check cleanly. They are always parsed assuming that they contain
25 const brokenPkg = "package broken_"
27 func parseSrc(path, src string) (*syntax.File, error) {
28 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
29 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, 0)
32 func pkgFor(path, source string, info *Info) (*Package, error) {
33 f, err := parseSrc(path, source)
37 conf := Config{Importer: defaultImporter()}
38 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
41 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
42 pkg, err := pkgFor(path, source, info)
46 name = "package " + pkg.Name()
48 t.Fatalf("%s: didn't type-check (%s)", name, err)
53 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
54 f, err := parseSrc(path, source)
55 if f == nil { // ignore errors unless f is nil
56 t.Fatalf("%s: unable to parse: %s", path, err)
59 Error: func(err error) {},
60 Importer: defaultImporter(),
62 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
63 return pkg.Name(), err
66 func TestValuesInfo(t *testing.T) {
67 var tests = []struct {
69 expr string // constant expression
70 typ string // constant type
71 val string // constant value
73 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
74 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
75 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
76 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
77 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
78 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
80 {`package b0; var _ = false`, `false`, `bool`, `false`},
81 {`package b1; var _ = 0`, `0`, `int`, `0`},
82 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
83 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
84 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
85 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
87 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
88 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
89 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
91 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
92 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
93 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
95 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
96 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
97 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
99 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
100 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
101 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
103 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
104 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
105 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
107 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
108 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
109 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
110 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
111 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
112 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
114 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
115 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
116 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
117 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
119 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
120 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
121 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
122 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
123 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
124 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
125 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
126 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
128 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
129 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
130 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
131 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
132 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
133 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
134 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
135 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
136 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
139 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
141 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
142 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
145 for _, test := range tests {
147 Types: make(map[syntax.Expr]TypeAndValue),
149 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
151 // look for expression
153 for e := range info.Types {
154 if syntax.String(e) == test.expr {
160 t.Errorf("package %s: no expression found for %s", name, test.expr)
163 tv := info.Types[expr]
165 // check that type is correct
166 if got := tv.Type.String(); got != test.typ {
167 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
171 // if we have a constant, check that value is correct
173 if got := tv.Value.ExactString(); got != test.val {
174 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
178 t.Errorf("package %s: no constant found; want %s", name, test.val)
184 func TestTypesInfo(t *testing.T) {
185 var tests = []struct {
187 expr string // expression
188 typ string // value type
190 // single-valued expressions of untyped constants
191 {`package b0; var x interface{} = false`, `false`, `bool`},
192 {`package b1; var x interface{} = 0`, `0`, `int`},
193 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
194 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
195 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
198 {`package n0; var _ *int = nil`, `nil`, `*int`},
199 {`package n1; var _ func() = nil`, `nil`, `func()`},
200 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
201 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
202 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
203 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
204 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
205 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
207 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
208 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
209 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
210 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
211 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
212 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
213 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
214 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
216 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
217 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
218 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
219 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
220 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
221 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
222 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
223 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
225 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
226 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
227 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
228 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
229 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
230 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
231 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
232 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
234 // comma-ok expressions
235 {`package p0; var x interface{}; var _, _ = x.(int)`,
239 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
243 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
245 `(complex128, p2a.mybool)`,
247 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
249 `(complex128, bool)`,
251 {`package p3; var c chan string; var _, _ = <-c`,
257 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
261 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
265 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
269 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
273 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
279 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
283 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
287 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
291 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
295 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
299 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
305 {`package issue28277_a; func f(...int)`,
309 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
314 // tests for broken code that doesn't parse or type-check
315 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
316 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
317 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
318 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
319 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
320 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
322 // parameterized functions
323 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
324 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
325 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
326 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
327 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
328 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
331 {`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
332 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
333 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
334 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
335 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
337 // instantiated types must be sanitized
338 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
341 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
344 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
347 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
348 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
349 {`package u2a; func _[_ interface{int|string}]() {}`, `int | string`, `int|string`},
350 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string | ~bool`, `int|string|~bool`},
351 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string`, `int|string`},
352 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `~bool`, `~bool`},
353 {`package u3a; func _[_ interface{int|string|~float64|~bool}]() {}`, `int | string | ~float64`, `int|string|~float64`},
355 {`package u0b; func _[_ int]() {}`, `int`, `int`},
356 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
357 {`package u2b; func _[_ int|string]() {}`, `int | string`, `int|string`},
358 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string | ~bool`, `int|string|~bool`},
359 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string`, `int|string`},
360 {`package u3b; func _[_ int|string|~bool]() {}`, `~bool`, `~bool`},
361 {`package u3b; func _[_ int|string|~float64|~bool]() {}`, `int | string | ~float64`, `int|string|~float64`},
363 {`package u0c; type _ interface{int}`, `int`, `int`},
364 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
365 {`package u2c; type _ interface{int|string}`, `int | string`, `int|string`},
366 {`package u3c; type _ interface{int|string|~bool}`, `int | string | ~bool`, `int|string|~bool`},
367 {`package u3c; type _ interface{int|string|~bool}`, `int | string`, `int|string`},
368 {`package u3c; type _ interface{int|string|~bool}`, `~bool`, `~bool`},
369 {`package u3c; type _ interface{int|string|~float64|~bool}`, `int | string | ~float64`, `int|string|~float64`},
372 for _, test := range tests {
373 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
375 if strings.HasPrefix(test.src, brokenPkg) {
377 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
379 t.Errorf("package %s: expected to fail but passed", name)
383 name = mustTypecheck(t, "TypesInfo", test.src, &info)
386 // look for expression type
388 for e, tv := range info.Types {
389 if syntax.String(e) == test.expr {
395 t.Errorf("package %s: no type found for %s", name, test.expr)
399 // check that type is correct
400 if got := typ.String(); got != test.typ {
401 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
406 func TestInstanceInfo(t *testing.T) {
407 const lib = `package lib
414 type testInst struct {
420 var tests = []struct {
422 instances []testInst // recorded instances in source order
424 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
425 []testInst{{`f`, []string{`int`}, `func(int)`}},
427 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
428 []testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
430 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
431 []testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
433 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
434 []testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
436 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
437 []testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
440 {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
441 []testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
443 {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
444 []testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
446 {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
448 {`C`, []string{`T`}, `interface{chan<- T}`},
449 {`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
452 {`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) }`,
454 {`C`, []string{`T`}, `interface{chan<- T}`},
455 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
456 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
460 {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
461 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
463 {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
464 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
466 {`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] }`,
468 {`C`, []string{`T`}, `interface{chan<- T}`},
469 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
470 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
473 {`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]) }`,
475 {`C`, []string{`T`}, `interface{chan<- T}`},
476 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
477 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
480 {`package i0; import "lib"; func _() { lib.F(42) }`,
481 []testInst{{`F`, []string{`int`}, `func(int)`}},
484 {`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
486 {`f`, []string{`int`}, `func(int)`},
487 {`f`, []string{`string`}, `func(string)`},
488 {`f`, []string{`int`}, `func(int)`},
491 {`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
493 {`F`, []string{`int`}, `func(int)`},
494 {`F`, []string{`string`}, `func(string)`},
495 {`F`, []string{`int`}, `func(int)`},
499 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
500 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
502 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
503 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
505 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
506 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
508 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
509 []testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
511 {`package type4; import "lib"; var _ lib.T[int]`,
512 []testInst{{`T`, []string{`int`}, `[]int`}},
515 {`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
517 {`T`, []string{`int`}, `struct{x int}`},
518 {`T`, []string{`int`}, `struct{x int}`},
521 {`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
523 {`T`, []string{`Q`}, `struct{x Q}`},
524 {`T`, []string{`Q`}, `struct{x Q}`},
527 {`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
529 {`T`, []string{`int`}, `[]int`},
530 {`T`, []string{`int`}, `[]int`},
531 {`T`, []string{`string`}, `[]string`},
536 for _, test := range tests {
537 imports := make(testImporter)
538 conf := Config{Importer: imports}
539 instMap := make(map[*syntax.Name]Instance)
540 useMap := make(map[*syntax.Name]Object)
541 makePkg := func(src string) *Package {
542 f, err := parseSrc("p.go", src)
546 pkg, err := conf.Check("", []*syntax.File{f}, &Info{Instances: instMap, Uses: useMap})
550 imports[pkg.Name()] = pkg
554 pkg := makePkg(test.src)
556 t.Run(pkg.Name(), func(t *testing.T) {
557 // Sort instances in source order for stability.
558 instances := sortedInstances(instMap)
559 if got, want := len(instances), len(test.instances); got != want {
560 t.Fatalf("got %d instances, want %d", got, want)
563 // Pairwise compare with the expected instances.
564 for ii, inst := range instances {
566 for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
567 targs = append(targs, inst.Inst.TypeArgs.At(i))
569 typ := inst.Inst.Type
571 testInst := test.instances[ii]
572 if got := inst.Name.Value; got != testInst.name {
573 t.Fatalf("got name %s, want %s", got, testInst.name)
576 if len(targs) != len(testInst.targs) {
577 t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
579 for i, targ := range targs {
580 if got := targ.String(); got != testInst.targs[i] {
581 t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
584 if got := typ.Underlying().String(); got != testInst.typ {
585 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
588 // Verify the invariant that re-instantiating the corresponding generic
589 // type with TypeArgs results in an identical instance.
590 ptype := useMap[inst.Name].Type()
591 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
592 if lister == nil || lister.TypeParams().Len() == 0 {
593 t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Name, ptype)
595 inst2, err := Instantiate(nil, ptype, targs, true)
597 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
599 if !Identical(inst.Inst.Type, inst2) {
600 t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
607 type recordedInstance struct {
612 func sortedInstances(m map[*syntax.Name]Instance) (instances []recordedInstance) {
613 for id, inst := range m {
614 instances = append(instances, recordedInstance{id, inst})
616 sort.Slice(instances, func(i, j int) bool {
617 return instances[i].Name.Pos().Cmp(instances[j].Name.Pos()) < 0
622 func TestDefsInfo(t *testing.T) {
623 var tests = []struct {
628 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
629 {`package p1; const x int = 42`, `x`, `const p1.x int`},
630 {`package p2; var x int`, `x`, `var p2.x int`},
631 {`package p3; type x int`, `x`, `type p3.x int`},
632 {`package p4; func f()`, `f`, `func p4.f()`},
633 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
635 // Tests using generics.
636 {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
637 {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
638 {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
641 for _, test := range tests {
643 Defs: make(map[*syntax.Name]Object),
645 name := mustTypecheck(t, "DefsInfo", test.src, &info)
649 for id, obj := range info.Defs {
650 if id.Value == test.obj {
656 t.Errorf("package %s: %s not found", name, test.obj)
660 if got := def.String(); got != test.want {
661 t.Errorf("package %s: got %s; want %s", name, got, test.want)
666 func TestUsesInfo(t *testing.T) {
667 var tests = []struct {
672 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
673 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
674 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
675 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
676 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
678 // Tests using generics.
679 {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
680 {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
681 {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
682 {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
684 // Uses of fields are instantiated.
685 {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
686 {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
688 // Uses of methods are uses of the instantiated method.
689 {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
690 {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
691 {`package m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
692 {`package m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
693 {`package m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
694 {`package m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m5.T[B]).m() B`},
695 {`package m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m6.T[B]).m()`},
696 {`package m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (m7.T[int]).m() int`},
697 {`package m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (m8.T[int]).m()`},
698 {`package m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (m9.T[int]).m()`},
700 `package m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
702 `func (m10.E[int]).m()`,
706 for _, test := range tests {
708 Uses: make(map[*syntax.Name]Object),
710 name := mustTypecheck(t, "UsesInfo", test.src, &info)
714 for id, obj := range info.Uses {
715 if id.Value == test.obj {
717 panic(fmt.Sprintf("multiple uses of %q", id.Value))
723 t.Errorf("package %s: %s not found", name, test.obj)
727 if got := use.String(); got != test.want {
728 t.Errorf("package %s: got %s; want %s", name, got, test.want)
733 func TestGenericMethodInfo(t *testing.T) {
738 func (r N[B]) m() { r.m(); r.n() }
740 func (r *N[C]) n() { }
742 f, err := parseSrc("p.go", src)
747 Defs: make(map[*syntax.Name]Object),
748 Uses: make(map[*syntax.Name]Object),
749 Selections: make(map[*syntax.SelectorExpr]*Selection),
752 pkg, err := conf.Check("p", []*syntax.File{f}, &info)
757 N := pkg.Scope().Lookup("N").Type().(*Named)
759 // Find the generic methods stored on N.
760 gm, gn := N.Method(0), N.Method(1)
761 if gm.Name() == "n" {
765 // Collect objects from info.
766 var dm, dn *Func // the declared methods
767 var dmm, dmn *Func // the methods used in the body of m
768 for _, decl := range f.DeclList {
769 fdecl, ok := decl.(*syntax.FuncDecl)
773 def := info.Defs[fdecl.Name].(*Func)
774 switch fdecl.Name.Value {
777 syntax.Inspect(fdecl.Body, func(n syntax.Node) bool {
778 if call, ok := n.(*syntax.CallExpr); ok {
779 sel := call.Fun.(*syntax.SelectorExpr)
780 use := info.Uses[sel.Sel].(*Func)
781 selection := info.Selections[sel]
782 if selection.Kind() != MethodVal {
783 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
785 if selection.Obj() != use {
786 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
788 switch sel.Sel.Value {
803 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
806 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
809 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
812 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
816 func TestImplicitsInfo(t *testing.T) {
817 testenv.MustHaveGoBuild(t)
819 var tests = []struct {
823 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
824 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
825 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
827 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
828 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
829 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
830 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
832 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
833 {`package p8; func f(int) {}`, "field: var int"},
834 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
835 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
837 // Tests using generics.
838 {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
839 {`package f1; func f[T any](int) {}`, "field: var int"},
840 {`package f2; func f[T any](T) {}`, "field: var T"},
841 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
842 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
843 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
844 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
845 {`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]"},
846 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
849 for _, test := range tests {
851 Implicits: make(map[syntax.Node]Object),
853 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
855 // the test cases expect at most one Implicits entry
856 if len(info.Implicits) > 1 {
857 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
861 // extract Implicits entry, if any
863 for n, obj := range info.Implicits {
864 switch x := n.(type) {
865 case *syntax.ImportDecl:
867 case *syntax.CaseClause:
872 t.Fatalf("package %s: unexpected %T", name, x)
874 got += ": " + obj.String()
878 if got != test.want {
879 t.Errorf("package %s: got %q; want %q", name, got, test.want)
884 func predString(tv TypeAndValue) string {
886 pred := func(b bool, s string) {
889 buf.WriteString(", ")
895 pred(tv.IsVoid(), "void")
896 pred(tv.IsType(), "type")
897 pred(tv.IsBuiltin(), "builtin")
898 pred(tv.IsValue() && tv.Value != nil, "const")
899 pred(tv.IsValue() && tv.Value == nil, "value")
900 pred(tv.IsNil(), "nil")
901 pred(tv.Addressable(), "addressable")
902 pred(tv.Assignable(), "assignable")
903 pred(tv.HasOk(), "hasOk")
911 func TestPredicatesInfo(t *testing.T) {
912 testenv.MustHaveGoBuild(t)
914 var tests = []struct {
920 {`package n0; func f() { f() }`, `f()`, `void`},
923 {`package t0; type _ int`, `int`, `type`},
924 {`package t1; type _ []int`, `[]int`, `type`},
925 {`package t2; type _ func()`, `func()`, `type`},
926 {`package t3; type _ func(int)`, `int`, `type`},
927 {`package t3; type _ func(...int)`, `...int`, `type`},
930 {`package b0; var _ = len("")`, `len`, `builtin`},
931 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
934 {`package c0; var _ = 42`, `42`, `const`},
935 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
936 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
939 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
940 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
941 {`package v2; var _ = func(){}`, `func() {}`, `value`},
942 {`package v4; func f() { _ = f }`, `f`, `value`},
943 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
944 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
946 // addressable (and thus assignable) operands
947 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
948 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
949 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
950 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
951 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
952 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
953 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
954 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
955 // composite literals are not addressable
957 // assignable but not addressable values
958 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
959 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
962 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
963 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
966 // - package names are collected in the Uses map
967 // - identifiers being declared are collected in the Defs map
968 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
969 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
970 {`package m2; const c = 0`, `c`, `<missing>`},
971 {`package m3; type T int`, `T`, `<missing>`},
972 {`package m4; var v int`, `v`, `<missing>`},
973 {`package m5; func f() {}`, `f`, `<missing>`},
974 {`package m6; func _(x int) {}`, `x`, `<missing>`},
975 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
976 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
979 for _, test := range tests {
980 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
981 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
983 // look for expression predicates
985 for e, tv := range info.Types {
986 //println(name, syntax.String(e))
987 if syntax.String(e) == test.expr {
993 if got != test.pred {
994 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
999 func TestScopesInfo(t *testing.T) {
1000 testenv.MustHaveGoBuild(t)
1002 var tests = []struct {
1004 scopes []string // list of scope descriptors of the form kind:varlist
1006 {`package p0`, []string{
1009 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1012 {`package p2; func _() {}`, []string{
1015 {`package p3; func _(x, y int) {}`, []string{
1016 "file:", "func:x y",
1018 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1019 "file:", "func:x y z", // redeclaration of x
1021 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1022 "file:", "func:u x y",
1024 {`package p6; func _() { { var x int; _ = x } }`, []string{
1025 "file:", "func:", "block:x",
1027 {`package p7; func _() { if true {} }`, []string{
1028 "file:", "func:", "if:", "block:",
1030 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1031 "file:", "func:", "if:x", "block:y",
1033 {`package p9; func _() { switch x := 0; x {} }`, []string{
1034 "file:", "func:", "switch:x",
1036 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1037 "file:", "func:", "switch:x", "case:y", "case:",
1039 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1040 "file:", "func:t", "switch:",
1042 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1043 "file:", "func:t", "switch:t",
1045 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1046 "file:", "func:t", "switch:", "case:x", // x implicitly declared
1048 {`package p14; func _() { select{} }`, []string{
1051 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1052 "file:", "func:c", "comm:",
1054 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1055 "file:", "func:c", "comm:i x",
1057 {`package p17; func _() { for{} }`, []string{
1058 "file:", "func:", "for:", "block:",
1060 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1061 "file:", "func:n", "for:i", "block:",
1063 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1064 "file:", "func:a", "for:i", "block:",
1066 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1067 "file:", "func:a", "for:i x", "block:",
1071 for _, test := range tests {
1072 info := Info{Scopes: make(map[syntax.Node]*Scope)}
1073 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
1075 // number of scopes must match
1076 if len(info.Scopes) != len(test.scopes) {
1077 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1080 // scope descriptions must match
1081 for node, scope := range info.Scopes {
1083 switch node.(type) {
1086 case *syntax.FuncType:
1088 case *syntax.BlockStmt:
1090 case *syntax.IfStmt:
1092 case *syntax.SwitchStmt:
1094 case *syntax.SelectStmt:
1096 case *syntax.CaseClause:
1098 case *syntax.CommClause:
1100 case *syntax.ForStmt:
1103 kind = fmt.Sprintf("%T", node)
1106 // look for matching scope description
1107 desc := kind + ":" + strings.Join(scope.Names(), " ")
1109 for _, d := range test.scopes {
1116 t.Errorf("package %s: no matching scope found for %s", name, desc)
1122 func TestInitOrderInfo(t *testing.T) {
1123 var tests = []struct {
1127 {`package p0; var (x = 1; y = x)`, []string{
1130 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1131 "a = 1", "b = 2", "c = 3",
1133 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1134 "a = 1", "b = 2", "c = 3",
1136 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1137 "_ = f()", // blank var
1139 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1140 "a = 0", "z = 0", "y = z", "x = y",
1142 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1143 "a, _ = m[0]", // blank var
1145 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1146 "z = 0", "a, b = f()",
1148 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1149 "b = 1", "a = func() int {…}()",
1151 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1152 "c = 1", "a, b = func() (_, _ int) {…}()",
1154 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1157 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1158 "a = 0", "b = 0", "c = 0", "d = c + b",
1160 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1161 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1163 // emit an initializer for n:1 initializations only once (not for each node
1164 // on the lhs which may appear in different order in the dependency graph)
1165 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1166 "b = 0", "x, y = m[0]", "a = x",
1168 // test case from spec section on package initialization
1182 "d = 3", "b = f()", "c = f()", "a = c + b",
1184 // test case for issue 7131
1188 func next() int { counter++; return counter }
1191 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1194 var b, c = next(), next()
1195 var d, e, f = next(), next(), next()
1197 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1199 // test case for issue 10709
1209 func (T) m() int { return 0 }
1211 func makeT(n int) T {
1217 "t = makeT(0)", "v = t.m()",
1219 // test case for issue 10709: same as test before, but variable decls swapped
1229 func (T) m() int { return 0 }
1231 func makeT(n int) T {
1237 "t = makeT(0)", "v = t.m()",
1239 // another candidate possibly causing problems with issue 10709
1244 func f1() int { return g1() }
1245 func g1() int { f1(); return x1 }
1251 func f2() int { return g2() }
1252 func g2() int { return x2 }
1254 var x2 = 0`, []string{
1255 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1259 for _, test := range tests {
1261 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1263 // number of initializers must match
1264 if len(info.InitOrder) != len(test.inits) {
1265 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1269 // initializers must match
1270 for i, want := range test.inits {
1271 got := info.InitOrder[i].String()
1273 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1280 func TestMultiFileInitOrder(t *testing.T) {
1281 mustParse := func(src string) *syntax.File {
1282 f, err := parseSrc("main", src)
1289 fileA := mustParse(`package main; var a = 1`)
1290 fileB := mustParse(`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 {
1296 files []*syntax.File
1299 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1300 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1303 if _, err := new(Config).Check("main", 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 pkg := NewPackage("p", "p")
1323 check := NewChecker(&conf, pkg, &info)
1325 for i, src := range sources {
1326 filename := fmt.Sprintf("sources%d", i)
1327 f, err := parseSrc(filename, src)
1331 if err := check.Files([]*syntax.File{f}); err != nil {
1336 // check InitOrder is [x y]
1338 for _, init := range info.InitOrder {
1339 for _, v := range init.Lhs {
1340 vars = append(vars, v.Name())
1343 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1344 t.Errorf("InitOrder == %s, want %s", got, want)
1348 type testImporter map[string]*Package
1350 func (m testImporter) Import(path string) (*Package, error) {
1351 if pkg := m[path]; pkg != nil {
1354 return nil, fmt.Errorf("package %q not found", path)
1357 func TestSelection(t *testing.T) {
1358 selections := make(map[*syntax.SelectorExpr]*Selection)
1360 imports := make(testImporter)
1361 conf := Config{Importer: imports}
1362 makePkg := func(path, src string) {
1363 f, err := parseSrc(path+".go", src)
1367 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1401 type G[P any] struct {
1413 // qualified identifiers
1451 // method expressions
1459 wantOut := map[string][2]string{
1460 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1462 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1463 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1464 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1465 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1466 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1467 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1468 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1469 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1470 "Inst.p": {"field (main.G[int]) p int", ".[0]"},
1472 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1473 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1474 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1475 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1476 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1477 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1478 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1479 "C{}.g": {"method (main.C) g()", ".[0]"},
1480 "new(C).g": {"method (*main.C) g()", "->[0]"},
1481 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1482 "Inst.m": {"method (main.G[int]) m(int)", ".[0]"},
1484 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1485 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1486 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1487 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1488 "G[string].m": {"method expr (main.G[string]) m(main.G[string], string)", ".[0]"},
1489 "G[string]{}.p": {"field (main.G[string]) p string", ".[0]"},
1492 makePkg("lib", libSrc)
1493 makePkg("main", mainSrc)
1495 for e, sel := range selections {
1496 _ = sel.String() // assertion: must not panic
1498 start := indexFor(mainSrc, syntax.StartPos(e))
1499 end := indexFor(mainSrc, syntax.EndPos(e))
1500 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1508 fmt.Sprintf("%s%v", direct, sel.Index()),
1510 want := wantOut[segment]
1512 t.Errorf("%s: got %q; want %q", segment, got, want)
1514 delete(wantOut, segment)
1516 // We must explicitly assert properties of the
1517 // Signature's receiver since it doesn't participate
1518 // in Identical() or String().
1519 sig, _ := sel.Type().(*Signature)
1520 if sel.Kind() == MethodVal {
1521 got := sig.Recv().Type()
1523 if !Identical(got, want) {
1524 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1526 } else if sig != nil && sig.Recv() != nil {
1527 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1530 // Assert that all wantOut entries were used exactly once.
1531 for segment := range wantOut {
1532 t.Errorf("no syntax.Selection found with syntax %q", segment)
1536 // indexFor returns the index into s corresponding to the position pos.
1537 func indexFor(s string, pos syntax.Pos) int {
1538 i, line := 0, 1 // string index and corresponding line
1539 target := int(pos.Line())
1540 for line < target && i < len(s) {
1546 return i + int(pos.Col()-1) // columns are 1-based
1549 func TestIssue8518(t *testing.T) {
1550 imports := make(testImporter)
1552 Error: func(err error) { t.Log(err) }, // don't exit after first error
1555 makePkg := func(path, src string) {
1556 f, err := parseSrc(path, src)
1560 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1568 const C2 = missing.C
1578 makePkg("a", libSrc)
1579 makePkg("main", mainSrc) // don't crash when type-checking this package
1582 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1583 // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
1585 const want = "LookupFieldOrMethod on nil type"
1587 if s, ok := p.(string); !ok || s != want {
1588 t.Fatalf("got %v, want %s", p, want)
1591 LookupFieldOrMethod(nil, false, nil, "")
1594 func TestLookupFieldOrMethod(t *testing.T) {
1595 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1596 // addressable value, and x for a non-addressable value (even though a variable
1597 // for ease of test case writing).
1598 var tests = []struct {
1605 {"var x T; type T struct{}", false, nil, false},
1606 {"var x T; type T struct{ f int }", true, []int{0}, false},
1607 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1610 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1611 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1612 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1613 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1616 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1617 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) 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},
1624 for _, test := range tests {
1625 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1627 t.Errorf("%s: incorrect test case: %s", test.src, err)
1631 obj := pkg.Scope().Lookup("a")
1633 if obj = pkg.Scope().Lookup("x"); obj == nil {
1634 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1639 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1640 if (f != nil) != test.found {
1642 t.Errorf("%s: got no object; want one", test.src)
1644 t.Errorf("%s: got object = %v; want none", test.src, f)
1647 if !sameSlice(index, test.index) {
1648 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1650 if indirect != test.indirect {
1651 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1656 func sameSlice(a, b []int) bool {
1657 if len(a) != len(b) {
1660 for i, x := range a {
1668 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1669 // the correct result at various positions within the source.
1670 func TestScopeLookupParent(t *testing.T) {
1671 imports := make(testImporter)
1672 conf := Config{Importer: imports}
1674 makePkg := func(path, src string) {
1675 f, err := parseSrc(path, src)
1679 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1685 makePkg("lib", "package lib; var X int")
1686 // Each /*name=kind:line*/ comment makes the test look up the
1687 // name at that point and checks that it resolves to a decl of
1688 // the specified kind and line number. "undef" means undefined.
1690 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1701 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1702 type /*t=undef*/ t /*t=typename:14*/ *t
1703 print(Y) /*Y=var:10*/
1704 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1705 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1708 for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
1711 switch y := i.(type) { /*y=undef*/
1712 case /*y=undef*/ int /*y=var:23*/ :
1713 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1714 default /*y=var:23*/:
1719 switch int := i.(type) {
1720 case /*int=typename:0*/ int /*int=var:31*/ :
1722 default /*int=var:31*/ :
1728 info.Uses = make(map[*syntax.Name]Object)
1729 makePkg("main", mainSrc)
1730 mainScope := imports["main"].Scope()
1732 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1734 base := syntax.NewFileBase("main")
1735 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1736 pos := syntax.MakePos(base, line, col)
1738 // Syntax errors are not comments.
1740 t.Errorf("%s: %s", pos, text)
1744 // Parse the assertion in the comment.
1745 m := rx.FindStringSubmatch(text)
1747 t.Errorf("%s: bad comment: %s", pos, text)
1750 name, want := m[1], m[2]
1752 // Look up the name in the innermost enclosing scope.
1753 inner := mainScope.Innermost(pos)
1755 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1759 if _, obj := inner.LookupParent(name, pos); obj != nil {
1760 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1761 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1764 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1768 // Check that for each referring identifier,
1769 // a lookup of its name on the innermost
1770 // enclosing scope returns the correct object.
1772 for id, wantObj := range info.Uses {
1773 inner := mainScope.Innermost(id.Pos())
1775 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1779 // Exclude selectors and qualified identifiers---lexical
1780 // refs only. (Ideally, we'd see if the AST parent is a
1781 // SelectorExpr, but that requires PathEnclosingInterval
1782 // from golang.org/x/tools/go/ast/astutil.)
1783 if id.Value == "X" {
1787 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1788 if gotObj != wantObj {
1789 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1795 var nopos syntax.Pos
1797 // newDefined creates a new defined type named T with the given underlying type.
1798 func newDefined(underlying Type) *Named {
1799 tname := NewTypeName(nopos, nil, "T", nil)
1800 return NewNamed(tname, underlying, nil)
1803 func TestConvertibleTo(t *testing.T) {
1804 for _, test := range []struct {
1808 {Typ[Int], Typ[Int], true},
1809 {Typ[Int], Typ[Float32], true},
1810 {Typ[Int], Typ[String], true},
1811 {newDefined(Typ[Int]), Typ[Int], true},
1812 {newDefined(new(Struct)), new(Struct), true},
1813 {newDefined(Typ[Int]), new(Struct), false},
1814 {Typ[UntypedInt], Typ[Int], true},
1815 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1816 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1817 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1818 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1819 {Typ[UntypedString], Typ[String], true},
1821 if got := ConvertibleTo(test.v, test.t); got != test.want {
1822 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1827 func TestAssignableTo(t *testing.T) {
1828 for _, test := range []struct {
1832 {Typ[Int], Typ[Int], true},
1833 {Typ[Int], Typ[Float32], false},
1834 {newDefined(Typ[Int]), Typ[Int], false},
1835 {newDefined(new(Struct)), new(Struct), true},
1836 {Typ[UntypedBool], Typ[Bool], true},
1837 {Typ[UntypedString], Typ[Bool], false},
1838 // Neither untyped string nor untyped numeric assignments arise during
1839 // normal type checking, so the below behavior is technically undefined by
1841 {Typ[UntypedString], Typ[String], true},
1842 {Typ[UntypedInt], Typ[Int], true},
1844 if got := AssignableTo(test.v, test.t); got != test.want {
1845 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1850 func TestIdentical(t *testing.T) {
1851 // For each test, we compare the types of objects X and Y in the source.
1857 {"var X int; var Y int", true},
1858 {"var X int; var Y string", false},
1860 // TODO: add more tests for complex types.
1863 {"type X int; type Y int", false},
1866 {"type X = int; type Y = int", true},
1869 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1870 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1871 {`func X(int) string { return "" }; func Y(int) {}`, false},
1873 // Generic functions. Type parameters should be considered identical modulo
1874 // renaming. See also issue #49722.
1875 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1876 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1877 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1878 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1879 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1880 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1883 for _, test := range tests {
1884 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1886 t.Errorf("%s: incorrect test case: %s", test.src, err)
1889 X := pkg.Scope().Lookup("X")
1890 Y := pkg.Scope().Lookup("Y")
1891 if X == nil || Y == nil {
1892 t.Fatal("test must declare both X and Y")
1894 if got := Identical(X.Type(), Y.Type()); got != test.want {
1895 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1900 func TestIdentical_issue15173(t *testing.T) {
1901 // Identical should allow nil arguments and be symmetric.
1902 for _, test := range []struct {
1906 {Typ[Int], Typ[Int], true},
1907 {Typ[Int], nil, false},
1908 {nil, Typ[Int], false},
1911 if got := Identical(test.x, test.y); got != test.want {
1912 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1917 func TestIdenticalUnions(t *testing.T) {
1918 tname := NewTypeName(nopos, nil, "myInt", nil)
1919 myInt := NewNamed(tname, Typ[Int], nil)
1920 tmap := map[string]*Term{
1921 "int": NewTerm(false, Typ[Int]),
1922 "~int": NewTerm(true, Typ[Int]),
1923 "string": NewTerm(false, Typ[String]),
1924 "~string": NewTerm(true, Typ[String]),
1925 "myInt": NewTerm(false, myInt),
1927 makeUnion := func(s string) *Union {
1928 parts := strings.Split(s, "|")
1930 for _, p := range parts {
1933 t.Fatalf("missing term %q", p)
1935 terms = append(terms, term)
1937 return NewUnion(terms)
1939 for _, test := range []struct {
1943 // These tests are just sanity checks. The tests for type sets and
1944 // interfaces provide much more test coverage.
1945 {"int|~int", "~int", true},
1946 {"myInt|~int", "~int", true},
1947 {"int|string", "string|int", true},
1948 {"int|int|string", "string|int", true},
1949 {"myInt|string", "int|string", false},
1951 x := makeUnion(test.x)
1952 y := makeUnion(test.y)
1953 if got := Identical(x, y); got != test.want {
1954 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1959 func TestIssue15305(t *testing.T) {
1960 const src = "package p; func f() int16; var _ = f(undef)"
1961 f, err := parseSrc("issue15305.go", src)
1966 Error: func(err error) {}, // allow errors
1969 Types: make(map[syntax.Expr]TypeAndValue),
1971 conf.Check("p", []*syntax.File{f}, info) // ignore result
1972 for e, tv := range info.Types {
1973 if _, ok := e.(*syntax.CallExpr); ok {
1974 if tv.Type != Typ[Int16] {
1975 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1980 t.Errorf("CallExpr has no type")
1983 // TestCompositeLitTypes verifies that Info.Types registers the correct
1984 // types for composite literal expressions and composite literal type
1986 func TestCompositeLitTypes(t *testing.T) {
1987 for _, test := range []struct {
1990 {`[16]byte{}`, `[16]byte`},
1991 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1992 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1993 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1994 {`[]int{}`, `[]int`},
1995 {`map[string]bool{"foo": true}`, `map[string]bool`},
1996 {`struct{}{}`, `struct{}`},
1997 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1999 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
2001 t.Fatalf("%s: %v", test.lit, err)
2005 Types: make(map[syntax.Expr]TypeAndValue),
2007 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2008 t.Fatalf("%s: %v", test.lit, err)
2011 cmptype := func(x syntax.Expr, want string) {
2012 tv, ok := info.Types[x]
2014 t.Errorf("%s: no Types entry found", test.lit)
2018 t.Errorf("%s: type is nil", test.lit)
2021 if got := tv.Type.String(); got != want {
2022 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2026 // test type of composite literal expression
2027 rhs := f.DeclList[0].(*syntax.VarDecl).Values
2028 cmptype(rhs, test.typ)
2030 // test type of composite literal type expression
2031 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
2035 // TestObjectParents verifies that objects have parent scopes or not
2036 // as specified by the Object interface.
2037 func TestObjectParents(t *testing.T) {
2056 func f(x int) { y := x; print(y) }
2059 f, err := parseSrc("src", src)
2065 Defs: make(map[*syntax.Name]Object),
2067 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2071 for ident, obj := range info.Defs {
2073 // only package names and implicit vars have a nil object
2074 // (in this test we only need to handle the package name)
2075 if ident.Value != "p" {
2076 t.Errorf("%v has nil object", ident)
2081 // struct fields, type-associated and interface methods
2082 // have no parent scope
2084 switch obj := obj.(type) {
2090 if obj.Type().(*Signature).Recv() != nil { // method
2095 gotParent := obj.Parent() != nil
2097 case gotParent && !wantParent:
2098 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2099 case !gotParent && wantParent:
2100 t.Errorf("%v: no parent found", ident)
2105 // TestFailedImport tests that we don't get follow-on errors
2106 // elsewhere in a package due to failing to import a package.
2107 func TestFailedImport(t *testing.T) {
2108 testenv.MustHaveGoBuild(t)
2113 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2118 func f(x T) T { return foo.F(x) }
2120 f, err := parseSrc("src", src)
2124 files := []*syntax.File{f}
2126 // type-check using all possible importers
2127 for _, compiler := range []string{"gc", "gccgo", "source"} {
2130 Error: func(err error) {
2131 // we should only see the import error
2132 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2133 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2137 //Importer: importer.For(compiler, nil),
2141 Uses: make(map[*syntax.Name]Object),
2143 pkg, _ := conf.Check("p", files, info)
2145 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2149 imports := pkg.Imports()
2150 if len(imports) != 1 {
2151 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2155 if imp.Name() != "foo" {
2156 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2160 // verify that all uses of foo refer to the imported package foo (imp)
2161 for ident, obj := range info.Uses {
2162 if ident.Value == "foo" {
2163 if obj, ok := obj.(*PkgName); ok {
2164 if obj.Imported() != imp {
2165 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
2168 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
2175 func TestInstantiate(t *testing.T) {
2176 // eventually we like more tests but this is a start
2177 const src = "package p; type T[P any] *T[P]"
2178 pkg, err := pkgFor(".", src, nil)
2183 // type T should have one type parameter
2184 T := pkg.Scope().Lookup("T").Type().(*Named)
2185 if n := T.TypeParams().Len(); n != 1 {
2186 t.Fatalf("expected 1 type parameter; found %d", n)
2189 // instantiation should succeed (no endless recursion)
2190 // even with a nil *Checker
2191 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2196 // instantiated type should point to itself
2197 if p := res.Underlying().(*Pointer).Elem(); p != res {
2198 t.Fatalf("unexpected result type: %s points to %s", res, p)
2202 func TestInstantiateErrors(t *testing.T) {
2204 src string // by convention, T must be the type being instantiated
2206 wantAt int // -1 indicates no error
2208 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2209 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2210 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2211 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2214 for _, test := range tests {
2215 src := "package p; " + test.src
2216 pkg, err := pkgFor(".", src, nil)
2221 T := pkg.Scope().Lookup("T").Type().(*Named)
2223 _, err = Instantiate(nil, T, test.targs, true)
2225 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2228 var argErr *ArgumentError
2229 if !errors.As(err, &argErr) {
2230 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2233 if argErr.Index != test.wantAt {
2234 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2239 func TestArgumentErrorUnwrapping(t *testing.T) {
2240 var err error = &ArgumentError{
2242 Err: Error{Msg: "test"},
2245 if !errors.As(err, &e) {
2246 t.Fatalf("error %v does not wrap types.Error", err)
2248 if e.Msg != "test" {
2249 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2253 func TestInstanceIdentity(t *testing.T) {
2254 imports := make(testImporter)
2255 conf := Config{Importer: imports}
2256 makePkg := func(src string) {
2257 f, err := parseSrc("", src)
2261 name := f.PkgName.Value
2262 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2268 makePkg(`package lib; type T[P any] struct{}`)
2269 makePkg(`package a; import "lib"; var A lib.T[int]`)
2270 makePkg(`package b; import "lib"; var B lib.T[int]`)
2271 a := imports["a"].Scope().Lookup("A")
2272 b := imports["b"].Scope().Lookup("B")
2273 if !Identical(a.Type(), b.Type()) {
2274 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2278 // TestInstantiatedObjects verifies properties of instantiated objects.
2279 func TestInstantiatedObjects(t *testing.T) {
2283 type T[P any] struct {
2287 func (recv *T[Q]) concreteMethod() {}
2289 type FT[P any] func(ftp P) (ftrp P)
2291 func F[P any](fp P) (frp P){ return }
2293 type I[P any] interface {
2305 Defs: make(map[*syntax.Name]Object),
2307 f, err := parseSrc("p.go", src)
2312 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
2317 lookup := func(name string) Type { return pkg.Scope().Lookup(name).Type() }
2322 {"field", lookup("t").Underlying().(*Struct).Field(0)},
2323 {"concreteMethod", lookup("t").(*Named).Method(0)},
2324 {"recv", lookup("t").(*Named).Method(0).Type().(*Signature).Recv()},
2325 {"ftp", lookup("ft").Underlying().(*Signature).Params().At(0)},
2326 {"ftrp", lookup("ft").Underlying().(*Signature).Results().At(0)},
2327 {"fp", lookup("f").(*Signature).Params().At(0)},
2328 {"frp", lookup("f").(*Signature).Results().At(0)},
2329 {"interfaceMethod", lookup("i").Underlying().(*Interface).Method(0)},
2332 // Collect all identifiers by name.
2333 idents := make(map[string][]*syntax.Name)
2334 syntax.Inspect(f, func(n syntax.Node) bool {
2335 if id, ok := n.(*syntax.Name); ok {
2336 idents[id.Value] = append(idents[id.Value], id)
2341 for _, test := range tests {
2343 t.Run(test.ident, func(t *testing.T) {
2344 if got := len(idents[test.ident]); got != 1 {
2345 t.Fatalf("found %d identifiers named %s, want 1", got, test.ident)
2347 ident := idents[test.ident][0]
2348 def := info.Defs[ident]
2349 if def == test.obj {
2350 t.Fatalf("info.Defs[%s] contains the test object", test.ident)
2352 if def.Pkg() != test.obj.Pkg() {
2353 t.Errorf("Pkg() = %v, want %v", def.Pkg(), test.obj.Pkg())
2355 if def.Name() != test.obj.Name() {
2356 t.Errorf("Name() = %v, want %v", def.Name(), test.obj.Name())
2358 if def.Pos() != test.obj.Pos() {
2359 t.Errorf("Pos() = %v, want %v", def.Pos(), test.obj.Pos())
2361 if def.Parent() != test.obj.Parent() {
2362 t.Fatalf("Parent() = %v, want %v", def.Parent(), test.obj.Parent())
2364 if def.Exported() != test.obj.Exported() {
2365 t.Fatalf("Exported() = %v, want %v", def.Exported(), test.obj.Exported())
2367 if def.Id() != test.obj.Id() {
2368 t.Fatalf("Id() = %v, want %v", def.Id(), test.obj.Id())
2370 // String and Type are expected to differ.
2375 func TestImplements(t *testing.T) {
2379 type EmptyIface interface{}
2390 type Integer interface{
2391 int8 | int16 | int32 | int64
2394 type EmptyTypeSet interface{
2411 type Bad Bad // invalid type
2414 f, err := parseSrc("p.go", src)
2418 conf := Config{Error: func(error) {}}
2419 pkg, _ := conf.Check(f.PkgName.Value, []*syntax.File{f}, nil)
2421 lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
2423 EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
2424 I = lookup("I").(*Named)
2425 II = I.Underlying().(*Interface)
2426 C = lookup("C").(*Named)
2427 CI = C.Underlying().(*Interface)
2428 Integer = lookup("Integer").Underlying().(*Interface)
2429 EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
2431 N1p = NewPointer(N1)
2433 N2p = NewPointer(N2)
2448 {Typ[Int8], Integer, true},
2449 {Typ[Int64], Integer, true},
2450 {Typ[String], Integer, false},
2451 {EmptyTypeSet, II, true},
2452 {EmptyTypeSet, EmptyTypeSet, true},
2453 {Typ[Int], EmptyTypeSet, false},
2468 {Bad, EmptyIface, true},
2471 for _, test := range tests {
2472 if got := Implements(test.V, test.T); got != test.want {
2473 t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
2476 // The type assertion x.(T) is valid if T is an interface or if T implements the type of x.
2477 // The assertion is never valid if T is a bad type.
2481 if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
2484 if got := AssertableTo(V, T); got != want {
2485 t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
2490 func TestMissingMethodAlternative(t *testing.T) {
2512 pkg, err := pkgFor("p.go", src, nil)
2517 T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
2518 lookup := func(name string) (*Func, bool) {
2519 return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
2522 // V0 has method m with correct signature. Should not report wrongType.
2523 method, wrongType := lookup("V0")
2524 if method != nil || wrongType {
2525 t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
2528 checkMissingMethod := func(tname string, reportWrongType bool) {
2529 method, wrongType := lookup(tname)
2530 if method == nil || method.Name() != "m" || wrongType != reportWrongType {
2531 t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
2535 // V1 has no method m. Should not report wrongType.
2536 checkMissingMethod("V1", false)
2538 // V2 has method m with wrong signature type (ignoring receiver). Should report wrongType.
2539 checkMissingMethod("V2", true)
2541 // V3 has no method m but it exists on *V3. Should report wrongType.
2542 checkMissingMethod("V3", true)
2544 // V4 has no method m but has M. Should not report wrongType.
2545 checkMissingMethod("V4", false)