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.
13 "go/internal/typeparams"
25 // pkgFor parses and type checks the package specified by path and source,
26 // populating info if provided.
28 // If source begins with "package generic_" and type parameters are enabled,
29 // generic code is permitted.
30 func pkgFor(path, source string, info *Info) (*Package, error) {
31 mode := modeForSource(source)
32 return pkgForMode(path, source, info, mode)
35 func pkgForMode(path, source string, info *Info, mode parser.Mode) (*Package, error) {
36 fset := token.NewFileSet()
37 f, err := parser.ParseFile(fset, path, source, mode)
41 conf := Config{Importer: importer.Default()}
42 return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
45 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
46 pkg, err := pkgFor(path, source, info)
50 name = "package " + pkg.Name()
52 t.Fatalf("%s: didn't type-check (%s)", name, err)
57 // genericPkg is a prefix for packages that should be type checked with
59 const genericPkg = "package generic_"
61 func modeForSource(src string) parser.Mode {
62 if !strings.HasPrefix(src, genericPkg) {
63 return typeparams.DisallowParsing
68 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
69 fset := token.NewFileSet()
70 mode := modeForSource(source)
71 f, err := parser.ParseFile(fset, path, source, mode)
72 if f == nil { // ignore errors unless f is nil
73 t.Fatalf("%s: unable to parse: %s", path, err)
76 Error: func(err error) {},
77 Importer: importer.Default(),
79 pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
80 return pkg.Name(), err
83 func TestValuesInfo(t *testing.T) {
84 var tests = []struct {
86 expr string // constant expression
87 typ string // constant type
88 val string // constant value
90 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
91 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
92 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
93 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
94 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
95 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
97 {`package b0; var _ = false`, `false`, `bool`, `false`},
98 {`package b1; var _ = 0`, `0`, `int`, `0`},
99 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
100 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
101 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
102 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
104 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
105 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
106 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
108 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
109 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
110 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
112 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
113 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
114 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
116 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
117 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
118 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
120 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
121 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
122 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
124 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
125 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
126 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
127 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
128 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
129 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
130 {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``},
132 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
133 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
134 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
135 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
137 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
138 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
139 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
140 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
141 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
142 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
143 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
144 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
146 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
147 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
148 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
149 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
150 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
151 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
152 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
153 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
154 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
155 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
156 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
157 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
159 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
160 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
163 for _, test := range tests {
165 Types: make(map[ast.Expr]TypeAndValue),
167 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
169 // look for expression
171 for e := range info.Types {
172 if ExprString(e) == test.expr {
178 t.Errorf("package %s: no expression found for %s", name, test.expr)
181 tv := info.Types[expr]
183 // check that type is correct
184 if got := tv.Type.String(); got != test.typ {
185 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
189 // if we have a constant, check that value is correct
191 if got := tv.Value.ExactString(); got != test.val {
192 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
196 t.Errorf("package %s: no constant found; want %s", name, test.val)
202 func TestTypesInfo(t *testing.T) {
203 // Test sources that are not expected to typecheck must start with the broken prefix.
204 const broken = "package broken_"
206 var tests = []struct {
208 expr string // expression
209 typ string // value type
211 // single-valued expressions of untyped constants
212 {`package b0; var x interface{} = false`, `false`, `bool`},
213 {`package b1; var x interface{} = 0`, `0`, `int`},
214 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
215 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
216 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
219 {`package n0; var _ *int = nil`, `nil`, `untyped nil`},
220 {`package n1; var _ func() = nil`, `nil`, `untyped nil`},
221 {`package n2; var _ []byte = nil`, `nil`, `untyped nil`},
222 {`package n3; var _ map[int]int = nil`, `nil`, `untyped nil`},
223 {`package n4; var _ chan int = nil`, `nil`, `untyped nil`},
224 {`package n5; var _ interface{} = nil`, `nil`, `untyped nil`},
225 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `untyped nil`},
227 {`package n10; var (x *int; _ = x == nil)`, `nil`, `untyped nil`},
228 {`package n11; var (x func(); _ = x == nil)`, `nil`, `untyped nil`},
229 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `untyped nil`},
230 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `untyped nil`},
231 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `untyped nil`},
232 {`package n15; var (x interface{}; _ = x == nil)`, `nil`, `untyped nil`},
233 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `untyped nil`},
235 {`package n20; var _ = (*int)(nil)`, `nil`, `untyped nil`},
236 {`package n21; var _ = (func())(nil)`, `nil`, `untyped nil`},
237 {`package n22; var _ = ([]byte)(nil)`, `nil`, `untyped nil`},
238 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `untyped nil`},
239 {`package n24; var _ = (chan int)(nil)`, `nil`, `untyped nil`},
240 {`package n25; var _ = (interface{})(nil)`, `nil`, `untyped nil`},
241 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `untyped nil`},
243 {`package n30; func f(*int) { f(nil) }`, `nil`, `untyped nil`},
244 {`package n31; func f(func()) { f(nil) }`, `nil`, `untyped nil`},
245 {`package n32; func f([]byte) { f(nil) }`, `nil`, `untyped nil`},
246 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `untyped nil`},
247 {`package n34; func f(chan int) { f(nil) }`, `nil`, `untyped nil`},
248 {`package n35; func f(interface{}) { f(nil) }`, `nil`, `untyped nil`},
249 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `untyped nil`},
251 // comma-ok expressions
252 {`package p0; var x interface{}; var _, _ = x.(int)`,
256 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
260 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
262 `(complex128, p2a.mybool)`,
264 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
266 `(complex128, bool)`,
268 {`package p3; var c chan string; var _, _ = <-c`,
274 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
278 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
282 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
286 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
290 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
296 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
300 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
304 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
308 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
312 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
316 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
322 {`package issue28277_a; func f(...int)`,
326 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
332 {`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`},
333 {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `uint`}, // issue 47410: should be untyped float
334 {`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`},
335 {`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`},
336 {`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`},
337 {`package issue47243_f; var x int32; var _ = 1 << 2`, `2`, `untyped int`},
338 {`package issue47243_g; var x int32; var _ = int(1) << 2`, `2`, `untyped int`},
339 {`package issue47243_h; var x int32; var _ = 1 << (2 << x)`, `1`, `int`},
340 {`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`},
341 {`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`},
343 // tests for broken code that doesn't parse or type-check
344 {broken + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
345 {broken + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
346 {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a; f: b;}}`, `b`, `string`},
347 {broken + `x3; var x = panic("");`, `panic`, `func(interface{})`},
348 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
349 {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
351 // parameterized functions
352 {genericPkg + `p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
353 {genericPkg + `p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
354 {genericPkg + `p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
355 {genericPkg + `p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
356 {genericPkg + `p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
357 {genericPkg + `p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
360 {genericPkg + `t0; type t[] int; var _ t`, `t`, `generic_t0.t`}, // t[] is a syntax error that is ignored in this test in favor of t
361 {genericPkg + `t1; type t[P any] int; var _ t[int]`, `t`, `generic_t1.t[P any]`},
362 {genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[P interface{}]`},
363 {genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[P, Q interface{}]`},
365 // TODO (rFindley): compare with types2, which resolves the type broken_t4.t[P₁, Q₂ interface{m()}] here
366 {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t`},
368 // instantiated types must be sanitized
369 {genericPkg + `g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `generic_g0.t[int]`},
372 {genericPkg + `issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
375 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
378 {genericPkg + `u0a; func _[_ interface{int}]() {}`, `int`, `int`},
379 {genericPkg + `u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
380 {genericPkg + `u2a; func _[_ interface{int|string}]() {}`, `int | string`, `int|string`},
381 {genericPkg + `u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string | ~bool`, `int|string|~bool`},
382 {genericPkg + `u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string`, `int|string`},
383 {genericPkg + `u3a; func _[_ interface{int|string|~bool}]() {}`, `~bool`, `~bool`},
384 {genericPkg + `u3a; func _[_ interface{int|string|~float64|~bool}]() {}`, `int | string | ~float64`, `int|string|~float64`},
386 {genericPkg + `u0b; func _[_ int]() {}`, `int`, `int`},
387 {genericPkg + `u1b; func _[_ ~int]() {}`, `~int`, `~int`},
388 {genericPkg + `u2b; func _[_ int|string]() {}`, `int | string`, `int|string`},
389 {genericPkg + `u3b; func _[_ int|string|~bool]() {}`, `int | string | ~bool`, `int|string|~bool`},
390 {genericPkg + `u3b; func _[_ int|string|~bool]() {}`, `int | string`, `int|string`},
391 {genericPkg + `u3b; func _[_ int|string|~bool]() {}`, `~bool`, `~bool`},
392 {genericPkg + `u3b; func _[_ int|string|~float64|~bool]() {}`, `int | string | ~float64`, `int|string|~float64`},
394 {genericPkg + `u0c; type _ interface{int}`, `int`, `int`},
395 {genericPkg + `u1c; type _ interface{~int}`, `~int`, `~int`},
396 {genericPkg + `u2c; type _ interface{int|string}`, `int | string`, `int|string`},
397 {genericPkg + `u3c; type _ interface{int|string|~bool}`, `int | string | ~bool`, `int|string|~bool`},
398 {genericPkg + `u3c; type _ interface{int|string|~bool}`, `int | string`, `int|string`},
399 {genericPkg + `u3c; type _ interface{int|string|~bool}`, `~bool`, `~bool`},
400 {genericPkg + `u3c; type _ interface{int|string|~float64|~bool}`, `int | string | ~float64`, `int|string|~float64`},
403 for _, test := range tests {
404 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
406 if strings.HasPrefix(test.src, broken) {
408 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
410 t.Errorf("package %s: expected to fail but passed", name)
414 name = mustTypecheck(t, "TypesInfo", test.src, &info)
417 // look for expression type
419 for e, tv := range info.Types {
420 if ExprString(e) == test.expr {
426 t.Errorf("package %s: no type found for %s", name, test.expr)
430 // check that type is correct
431 if got := typ.String(); got != test.typ {
432 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
437 func TestInstanceInfo(t *testing.T) {
438 var tests = []struct {
444 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
449 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
454 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
456 []string{`complex128`},
457 `func(...complex128) complex128`,
459 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
461 []string{`float64`, `string`, `byte`},
462 `func(float64, *string, []byte)`,
464 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
466 []string{`float64`, `byte`},
467 `func(float64, *byte, ...[]byte)`,
470 {`package s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
472 []string{`string`, `*string`},
475 {`package s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
477 []string{`int`, `*int`},
480 {`package s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
482 []string{`int`, `chan<- int`},
485 {`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) }`,
487 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
491 {`package t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
493 []string{`string`, `*string`},
496 {`package t2; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
498 []string{`string`, `*string`},
501 {`package t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]]() []T { return nil }; func _() { _ = f[int] }`,
503 []string{`int`, `chan<- int`},
506 {`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] }`,
508 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
511 {`package i0; import "lib"; func _() { lib.F(42) }`,
516 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
521 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
526 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
531 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
533 []string{`[]int`, `int`},
534 `struct{x []int; y int}`,
536 {`package type4; import "lib"; var _ lib.T[int]`,
543 for _, test := range tests {
544 const lib = `package lib
551 imports := make(testImporter)
552 conf := Config{Importer: imports}
553 instances := make(map[*ast.Ident]Instance)
554 uses := make(map[*ast.Ident]Object)
555 makePkg := func(src string) *Package {
556 f, err := parser.ParseFile(fset, "p.go", src, 0)
560 pkg, err := conf.Check("", fset, []*ast.File{f}, &Info{Instances: instances, Uses: uses})
564 imports[pkg.Name()] = pkg
568 pkg := makePkg(test.src)
570 // look for instance information
573 for ident, inst := range instances {
574 if ExprString(ident) == test.name {
575 for i := 0; i < inst.TypeArgs.Len(); i++ {
576 targs = append(targs, inst.TypeArgs.At(i))
580 // Check that we can find the corresponding parameterized type.
581 ptype := uses[ident].Type()
582 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
583 if lister == nil || lister.TypeParams().Len() == 0 {
584 t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
588 // Verify the invariant that re-instantiating the generic type with
589 // TypeArgs results in an equivalent type.
590 inst2, err := Instantiate(nil, ptype, targs, true)
592 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
594 if !Identical(inst.Type, inst2) {
595 t.Errorf("%v and %v are not identical", inst.Type, inst2)
601 t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
605 // check that type arguments are correct
606 if len(targs) != len(test.targs) {
607 t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
610 for i, targ := range targs {
611 if got := targ.String(); got != test.targs[i] {
612 t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
617 // check that the types match
618 if got := typ.Underlying().String(); got != test.typ {
619 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, test.typ)
624 func TestDefsInfo(t *testing.T) {
625 var tests = []struct {
630 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
631 {`package p1; const x int = 42`, `x`, `const p1.x int`},
632 {`package p2; var x int`, `x`, `var p2.x int`},
633 {`package p3; type x int`, `x`, `type p3.x int`},
634 {`package p4; func f()`, `f`, `func p4.f()`},
635 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
638 for _, test := range tests {
640 Defs: make(map[*ast.Ident]Object),
642 name := mustTypecheck(t, "DefsInfo", test.src, &info)
646 for id, obj := range info.Defs {
647 if id.Name == test.obj {
653 t.Errorf("package %s: %s not found", name, test.obj)
657 if got := def.String(); got != test.want {
658 t.Errorf("package %s: got %s; want %s", name, got, test.want)
663 func TestUsesInfo(t *testing.T) {
664 var tests = []struct {
669 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
670 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
671 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
672 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
673 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
676 for _, test := range tests {
678 Uses: make(map[*ast.Ident]Object),
680 name := mustTypecheck(t, "UsesInfo", test.src, &info)
684 for id, obj := range info.Uses {
685 if id.Name == test.obj {
691 t.Errorf("package %s: %s not found", name, test.obj)
695 if got := use.String(); got != test.want {
696 t.Errorf("package %s: got %s; want %s", name, got, test.want)
701 func TestImplicitsInfo(t *testing.T) {
702 testenv.MustHaveGoBuild(t)
704 var tests = []struct {
708 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
709 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
710 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
712 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
713 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
714 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
715 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
717 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
718 {`package p8; func f(int) {}`, "field: var int"},
719 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
720 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
723 for _, test := range tests {
725 Implicits: make(map[ast.Node]Object),
727 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
729 // the test cases expect at most one Implicits entry
730 if len(info.Implicits) > 1 {
731 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
735 // extract Implicits entry, if any
737 for n, obj := range info.Implicits {
738 switch x := n.(type) {
739 case *ast.ImportSpec:
741 case *ast.CaseClause:
746 t.Fatalf("package %s: unexpected %T", name, x)
748 got += ": " + obj.String()
752 if got != test.want {
753 t.Errorf("package %s: got %q; want %q", name, got, test.want)
758 func predString(tv TypeAndValue) string {
760 pred := func(b bool, s string) {
763 buf.WriteString(", ")
769 pred(tv.IsVoid(), "void")
770 pred(tv.IsType(), "type")
771 pred(tv.IsBuiltin(), "builtin")
772 pred(tv.IsValue() && tv.Value != nil, "const")
773 pred(tv.IsValue() && tv.Value == nil, "value")
774 pred(tv.IsNil(), "nil")
775 pred(tv.Addressable(), "addressable")
776 pred(tv.Assignable(), "assignable")
777 pred(tv.HasOk(), "hasOk")
785 func TestPredicatesInfo(t *testing.T) {
786 testenv.MustHaveGoBuild(t)
788 var tests = []struct {
794 {`package n0; func f() { f() }`, `f()`, `void`},
797 {`package t0; type _ int`, `int`, `type`},
798 {`package t1; type _ []int`, `[]int`, `type`},
799 {`package t2; type _ func()`, `func()`, `type`},
800 {`package t3; type _ func(int)`, `int`, `type`},
801 {`package t3; type _ func(...int)`, `...int`, `type`},
804 {`package b0; var _ = len("")`, `len`, `builtin`},
805 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
808 {`package c0; var _ = 42`, `42`, `const`},
809 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
810 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
813 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
814 {`package v1; var _ = &[]int{1}`, `([]int literal)`, `value`},
815 {`package v2; var _ = func(){}`, `(func() literal)`, `value`},
816 {`package v4; func f() { _ = f }`, `f`, `value`},
817 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
818 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
820 // addressable (and thus assignable) operands
821 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
822 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
823 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
824 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
825 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
826 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
827 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
828 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
829 // composite literals are not addressable
831 // assignable but not addressable values
832 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
833 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
836 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
837 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
840 // - package names are collected in the Uses map
841 // - identifiers being declared are collected in the Defs map
842 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
843 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
844 {`package m2; const c = 0`, `c`, `<missing>`},
845 {`package m3; type T int`, `T`, `<missing>`},
846 {`package m4; var v int`, `v`, `<missing>`},
847 {`package m5; func f() {}`, `f`, `<missing>`},
848 {`package m6; func _(x int) {}`, `x`, `<missing>`},
849 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
850 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
853 for _, test := range tests {
854 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
855 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
857 // look for expression predicates
859 for e, tv := range info.Types {
860 //println(name, ExprString(e))
861 if ExprString(e) == test.expr {
867 if got != test.pred {
868 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
873 func TestScopesInfo(t *testing.T) {
874 testenv.MustHaveGoBuild(t)
876 var tests = []struct {
878 scopes []string // list of scope descriptors of the form kind:varlist
880 {`package p0`, []string{
883 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
886 {`package p2; func _() {}`, []string{
889 {`package p3; func _(x, y int) {}`, []string{
892 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
893 "file:", "func:x y z", // redeclaration of x
895 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
896 "file:", "func:u x y",
898 {`package p6; func _() { { var x int; _ = x } }`, []string{
899 "file:", "func:", "block:x",
901 {`package p7; func _() { if true {} }`, []string{
902 "file:", "func:", "if:", "block:",
904 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
905 "file:", "func:", "if:x", "block:y",
907 {`package p9; func _() { switch x := 0; x {} }`, []string{
908 "file:", "func:", "switch:x",
910 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
911 "file:", "func:", "switch:x", "case:y", "case:",
913 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
914 "file:", "func:t", "type switch:",
916 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
917 "file:", "func:t", "type switch:t",
919 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
920 "file:", "func:t", "type switch:", "case:x", // x implicitly declared
922 {`package p14; func _() { select{} }`, []string{
925 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
926 "file:", "func:c", "comm:",
928 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
929 "file:", "func:c", "comm:i x",
931 {`package p17; func _() { for{} }`, []string{
932 "file:", "func:", "for:", "block:",
934 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
935 "file:", "func:n", "for:i", "block:",
937 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
938 "file:", "func:a", "range:i", "block:",
940 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
941 "file:", "func:a", "range:i x", "block:",
945 for _, test := range tests {
946 info := Info{Scopes: make(map[ast.Node]*Scope)}
947 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
949 // number of scopes must match
950 if len(info.Scopes) != len(test.scopes) {
951 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
954 // scope descriptions must match
955 for node, scope := range info.Scopes {
956 kind := "<unknown node kind>"
966 case *ast.SwitchStmt:
968 case *ast.TypeSwitchStmt:
970 case *ast.CaseClause:
972 case *ast.CommClause:
980 // look for matching scope description
981 desc := kind + ":" + strings.Join(scope.Names(), " ")
983 for _, d := range test.scopes {
990 t.Errorf("package %s: no matching scope found for %s", name, desc)
996 func TestInitOrderInfo(t *testing.T) {
997 var tests = []struct {
1001 {`package p0; var (x = 1; y = x)`, []string{
1004 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1005 "a = 1", "b = 2", "c = 3",
1007 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1008 "a = 1", "b = 2", "c = 3",
1010 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1011 "_ = f()", // blank var
1013 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1014 "a = 0", "z = 0", "y = z", "x = y",
1016 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1017 "a, _ = m[0]", // blank var
1019 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1020 "z = 0", "a, b = f()",
1022 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1023 "b = 1", "a = (func() int literal)()",
1025 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1026 "c = 1", "a, b = (func() (_, _ int) literal)()",
1028 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1031 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1032 "a = 0", "b = 0", "c = 0", "d = c + b",
1034 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1035 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1037 // emit an initializer for n:1 initializations only once (not for each node
1038 // on the lhs which may appear in different order in the dependency graph)
1039 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1040 "b = 0", "x, y = m[0]", "a = x",
1042 // test case from spec section on package initialization
1056 "d = 3", "b = f()", "c = f()", "a = c + b",
1058 // test case for issue 7131
1062 func next() int { counter++; return counter }
1065 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1068 var b, c = next(), next()
1069 var d, e, f = next(), next(), next()
1071 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1073 // test case for issue 10709
1083 func (T) m() int { return 0 }
1085 func makeT(n int) T {
1091 "t = makeT(0)", "v = t.m()",
1093 // test case for issue 10709: same as test before, but variable decls swapped
1103 func (T) m() int { return 0 }
1105 func makeT(n int) T {
1111 "t = makeT(0)", "v = t.m()",
1113 // another candidate possibly causing problems with issue 10709
1118 func f1() int { return g1() }
1119 func g1() int { f1(); return x1 }
1125 func f2() int { return g2() }
1126 func g2() int { return x2 }
1128 var x2 = 0`, []string{
1129 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1133 for _, test := range tests {
1135 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1137 // number of initializers must match
1138 if len(info.InitOrder) != len(test.inits) {
1139 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1143 // initializers must match
1144 for i, want := range test.inits {
1145 got := info.InitOrder[i].String()
1147 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1154 func TestMultiFileInitOrder(t *testing.T) {
1155 fset := token.NewFileSet()
1156 mustParse := func(src string) *ast.File {
1157 f, err := parser.ParseFile(fset, "main", src, 0)
1164 fileA := mustParse(`package main; var a = 1`)
1165 fileB := mustParse(`package main; var b = 2`)
1167 // The initialization order must not depend on the parse
1168 // order of the files, only on the presentation order to
1169 // the type-checker.
1170 for _, test := range []struct {
1174 {[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"},
1175 {[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"},
1178 if _, err := new(Config).Check("main", fset, test.files, &info); err != nil {
1181 if got := fmt.Sprint(info.InitOrder); got != test.want {
1182 t.Fatalf("got %s; want %s", got, test.want)
1187 func TestFiles(t *testing.T) {
1188 var sources = []string{
1189 "package p; type T struct{}; func (T) m1() {}",
1190 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1191 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1196 fset := token.NewFileSet()
1197 pkg := NewPackage("p", "p")
1199 check := NewChecker(&conf, fset, pkg, &info)
1201 for i, src := range sources {
1202 filename := fmt.Sprintf("sources%d", i)
1203 f, err := parser.ParseFile(fset, filename, src, 0)
1207 if err := check.Files([]*ast.File{f}); err != nil {
1212 // check InitOrder is [x y]
1214 for _, init := range info.InitOrder {
1215 for _, v := range init.Lhs {
1216 vars = append(vars, v.Name())
1219 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1220 t.Errorf("InitOrder == %s, want %s", got, want)
1224 type testImporter map[string]*Package
1226 func (m testImporter) Import(path string) (*Package, error) {
1227 if pkg := m[path]; pkg != nil {
1230 return nil, fmt.Errorf("package %q not found", path)
1233 func TestSelection(t *testing.T) {
1234 selections := make(map[*ast.SelectorExpr]*Selection)
1236 fset := token.NewFileSet()
1237 imports := make(testImporter)
1238 conf := Config{Importer: imports}
1239 makePkg := func(path, src string) {
1240 f, err := parser.ParseFile(fset, path+".go", src, 0)
1244 pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
1282 // qualified identifiers
1316 // method expressions
1323 wantOut := map[string][2]string{
1324 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1326 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1327 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1328 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1329 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1330 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1331 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1332 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1333 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1335 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1336 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1337 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1338 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1339 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1340 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1341 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1342 "C{}.g": {"method (main.C) g()", ".[0]"},
1343 "new(C).g": {"method (*main.C) g()", "->[0]"},
1344 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1346 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1347 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1348 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1349 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1352 makePkg("lib", libSrc)
1353 makePkg("main", mainSrc)
1355 for e, sel := range selections {
1356 _ = sel.String() // assertion: must not panic
1358 start := fset.Position(e.Pos()).Offset
1359 end := fset.Position(e.End()).Offset
1360 syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1368 fmt.Sprintf("%s%v", direct, sel.Index()),
1370 want := wantOut[syntax]
1372 t.Errorf("%s: got %q; want %q", syntax, got, want)
1374 delete(wantOut, syntax)
1376 // We must explicitly assert properties of the
1377 // Signature's receiver since it doesn't participate
1378 // in Identical() or String().
1379 sig, _ := sel.Type().(*Signature)
1380 if sel.Kind() == MethodVal {
1381 got := sig.Recv().Type()
1383 if !Identical(got, want) {
1384 t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
1386 } else if sig != nil && sig.Recv() != nil {
1387 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1390 // Assert that all wantOut entries were used exactly once.
1391 for syntax := range wantOut {
1392 t.Errorf("no ast.Selection found with syntax %q", syntax)
1396 func TestIssue8518(t *testing.T) {
1397 fset := token.NewFileSet()
1398 imports := make(testImporter)
1400 Error: func(err error) { t.Log(err) }, // don't exit after first error
1403 makePkg := func(path, src string) {
1404 f, err := parser.ParseFile(fset, path, src, 0)
1408 pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
1416 const C2 = missing.C
1426 makePkg("a", libSrc)
1427 makePkg("main", mainSrc) // don't crash when type-checking this package
1430 func TestLookupFieldOrMethod(t *testing.T) {
1431 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1432 // addressable value, and x for a non-addressable value (even though a variable
1433 // for ease of test case writing).
1435 // Should be kept in sync with TestMethodSet.
1436 var tests = []struct {
1443 {"var x T; type T struct{}", false, nil, false},
1444 {"var x T; type T struct{ f int }", true, []int{0}, false},
1445 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1448 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1449 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1450 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1451 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1454 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1455 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1457 // outside methodset
1458 // (*T).f method exists, but value of type T is not addressable
1459 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1462 for _, test := range tests {
1463 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1465 t.Errorf("%s: incorrect test case: %s", test.src, err)
1469 obj := pkg.Scope().Lookup("a")
1471 if obj = pkg.Scope().Lookup("x"); obj == nil {
1472 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1477 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1478 if (f != nil) != test.found {
1480 t.Errorf("%s: got no object; want one", test.src)
1482 t.Errorf("%s: got object = %v; want none", test.src, f)
1485 if !sameSlice(index, test.index) {
1486 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1488 if indirect != test.indirect {
1489 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1494 func sameSlice(a, b []int) bool {
1495 if len(a) != len(b) {
1498 for i, x := range a {
1506 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1507 // the correct result at various positions with the source.
1508 func TestScopeLookupParent(t *testing.T) {
1509 fset := token.NewFileSet()
1510 imports := make(testImporter)
1511 conf := Config{Importer: imports}
1512 mustParse := func(src string) *ast.File {
1513 f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments)
1520 makePkg := func(path string, files ...*ast.File) {
1522 imports[path], err = conf.Check(path, fset, files, &info)
1528 makePkg("lib", mustParse("package lib; var X int"))
1529 // Each /*name=kind:line*/ comment makes the test look up the
1530 // name at that point and checks that it resolves to a decl of
1531 // the specified kind and line number. "undef" means undefined.
1533 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1544 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1545 type /*t=undef*/ t /*t=typename:14*/ *t
1546 print(Y) /*Y=var:10*/
1547 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1548 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1551 for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
1554 switch y := i.(type) { /*y=undef*/
1555 case /*y=undef*/ int /*y=var:23*/ :
1556 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1557 default /*y=var:23*/:
1562 switch int := i.(type) {
1563 case /*int=typename:0*/ int /*int=var:31*/ :
1565 default /*int=var:31*/ :
1571 info.Uses = make(map[*ast.Ident]Object)
1572 f := mustParse(mainSrc)
1574 mainScope := imports["main"].Scope()
1575 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1576 for _, group := range f.Comments {
1577 for _, comment := range group.List {
1578 // Parse the assertion in the comment.
1579 m := rx.FindStringSubmatch(comment.Text)
1581 t.Errorf("%s: bad comment: %s",
1582 fset.Position(comment.Pos()), comment.Text)
1585 name, want := m[1], m[2]
1587 // Look up the name in the innermost enclosing scope.
1588 inner := mainScope.Innermost(comment.Pos())
1590 t.Errorf("%s: at %s: can't find innermost scope",
1591 fset.Position(comment.Pos()), comment.Text)
1595 if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil {
1596 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
1597 got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line)
1600 t.Errorf("%s: at %s: %s resolved to %s, want %s",
1601 fset.Position(comment.Pos()), comment.Text, name, got, want)
1606 // Check that for each referring identifier,
1607 // a lookup of its name on the innermost
1608 // enclosing scope returns the correct object.
1610 for id, wantObj := range info.Uses {
1611 inner := mainScope.Innermost(id.Pos())
1613 t.Errorf("%s: can't find innermost scope enclosing %q",
1614 fset.Position(id.Pos()), id.Name)
1618 // Exclude selectors and qualified identifiers---lexical
1619 // refs only. (Ideally, we'd see if the AST parent is a
1620 // SelectorExpr, but that requires PathEnclosingInterval
1621 // from golang.org/x/tools/go/ast/astutil.)
1626 _, gotObj := inner.LookupParent(id.Name, id.Pos())
1627 if gotObj != wantObj {
1628 t.Errorf("%s: got %v, want %v",
1629 fset.Position(id.Pos()), gotObj, wantObj)
1635 // newDefined creates a new defined type named T with the given underlying type.
1636 // Helper function for use with TestIncompleteInterfaces only.
1637 func newDefined(underlying Type) *Named {
1638 tname := NewTypeName(token.NoPos, nil, "T", nil)
1639 return NewNamed(tname, underlying, nil)
1642 func TestConvertibleTo(t *testing.T) {
1643 for _, test := range []struct {
1647 {Typ[Int], Typ[Int], true},
1648 {Typ[Int], Typ[Float32], true},
1649 {Typ[Int], Typ[String], true},
1650 {newDefined(Typ[Int]), Typ[Int], true},
1651 {newDefined(new(Struct)), new(Struct), true},
1652 {newDefined(Typ[Int]), new(Struct), false},
1653 {Typ[UntypedInt], Typ[Int], true},
1654 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1655 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1656 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1657 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1658 {Typ[UntypedString], Typ[String], true},
1660 if got := ConvertibleTo(test.v, test.t); got != test.want {
1661 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1666 func TestAssignableTo(t *testing.T) {
1667 for _, test := range []struct {
1671 {Typ[Int], Typ[Int], true},
1672 {Typ[Int], Typ[Float32], false},
1673 {newDefined(Typ[Int]), Typ[Int], false},
1674 {newDefined(new(Struct)), new(Struct), true},
1675 {Typ[UntypedBool], Typ[Bool], true},
1676 {Typ[UntypedString], Typ[Bool], false},
1677 // Neither untyped string nor untyped numeric assignments arise during
1678 // normal type checking, so the below behavior is technically undefined by
1680 {Typ[UntypedString], Typ[String], true},
1681 {Typ[UntypedInt], Typ[Int], true},
1683 if got := AssignableTo(test.v, test.t); got != test.want {
1684 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1689 func TestIdentical(t *testing.T) {
1690 // For each test, we compare the types of objects X and Y in the source.
1696 {"var X int; var Y int", true},
1697 {"var X int; var Y string", false},
1699 // TODO: add more tests for complex types.
1702 {"type X int; type Y int", false},
1705 {"type X = int; type Y = int", true},
1708 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1709 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1710 {`func X(int) string { return "" }; func Y(int) {}`, false},
1712 // Generic functions. Type parameters should be considered identical modulo
1713 // renaming. See also issue #49722.
1714 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1715 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1716 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1717 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1718 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1719 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1722 for _, test := range tests {
1723 pkg, err := pkgForMode("test", "package p;"+test.src, nil, 0)
1725 t.Errorf("%s: incorrect test case: %s", test.src, err)
1728 X := pkg.Scope().Lookup("X")
1729 Y := pkg.Scope().Lookup("Y")
1730 if X == nil || Y == nil {
1731 t.Fatal("test must declare both X and Y")
1733 if got := Identical(X.Type(), Y.Type()); got != test.want {
1734 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1739 func TestIdentical_issue15173(t *testing.T) {
1740 // Identical should allow nil arguments and be symmetric.
1741 for _, test := range []struct {
1745 {Typ[Int], Typ[Int], true},
1746 {Typ[Int], nil, false},
1747 {nil, Typ[Int], false},
1750 if got := Identical(test.x, test.y); got != test.want {
1751 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1756 func TestIdenticalUnions(t *testing.T) {
1757 tname := NewTypeName(token.NoPos, nil, "myInt", nil)
1758 myInt := NewNamed(tname, Typ[Int], nil)
1759 tmap := map[string]*Term{
1760 "int": NewTerm(false, Typ[Int]),
1761 "~int": NewTerm(true, Typ[Int]),
1762 "string": NewTerm(false, Typ[String]),
1763 "~string": NewTerm(true, Typ[String]),
1764 "myInt": NewTerm(false, myInt),
1766 makeUnion := func(s string) *Union {
1767 parts := strings.Split(s, "|")
1769 for _, p := range parts {
1772 t.Fatalf("missing term %q", p)
1774 terms = append(terms, term)
1776 return NewUnion(terms)
1778 for _, test := range []struct {
1782 // These tests are just sanity checks. The tests for type sets and
1783 // interfaces provide much more test coverage.
1784 {"int|~int", "~int", true},
1785 {"myInt|~int", "~int", true},
1786 {"int|string", "string|int", true},
1787 {"int|int|string", "string|int", true},
1788 {"myInt|string", "int|string", false},
1790 x := makeUnion(test.x)
1791 y := makeUnion(test.y)
1792 if got := Identical(x, y); got != test.want {
1793 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1798 func TestIssue15305(t *testing.T) {
1799 const src = "package p; func f() int16; var _ = f(undef)"
1800 fset := token.NewFileSet()
1801 f, err := parser.ParseFile(fset, "issue15305.go", src, 0)
1806 Error: func(err error) {}, // allow errors
1809 Types: make(map[ast.Expr]TypeAndValue),
1811 conf.Check("p", fset, []*ast.File{f}, info) // ignore result
1812 for e, tv := range info.Types {
1813 if _, ok := e.(*ast.CallExpr); ok {
1814 if tv.Type != Typ[Int16] {
1815 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1820 t.Errorf("CallExpr has no type")
1823 // TestCompositeLitTypes verifies that Info.Types registers the correct
1824 // types for composite literal expressions and composite literal type
1826 func TestCompositeLitTypes(t *testing.T) {
1827 for _, test := range []struct {
1830 {`[16]byte{}`, `[16]byte`},
1831 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1832 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1833 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1834 {`[]int{}`, `[]int`},
1835 {`map[string]bool{"foo": true}`, `map[string]bool`},
1836 {`struct{}{}`, `struct{}`},
1837 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1839 fset := token.NewFileSet()
1840 f, err := parser.ParseFile(fset, test.lit, "package p; var _ = "+test.lit, 0)
1842 t.Fatalf("%s: %v", test.lit, err)
1846 Types: make(map[ast.Expr]TypeAndValue),
1848 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
1849 t.Fatalf("%s: %v", test.lit, err)
1852 cmptype := func(x ast.Expr, want string) {
1853 tv, ok := info.Types[x]
1855 t.Errorf("%s: no Types entry found", test.lit)
1859 t.Errorf("%s: type is nil", test.lit)
1862 if got := tv.Type.String(); got != want {
1863 t.Errorf("%s: got %v, want %s", test.lit, got, want)
1867 // test type of composite literal expression
1868 rhs := f.Decls[0].(*ast.GenDecl).Specs[0].(*ast.ValueSpec).Values[0]
1869 cmptype(rhs, test.typ)
1871 // test type of composite literal type expression
1872 cmptype(rhs.(*ast.CompositeLit).Type, test.typ)
1876 // TestObjectParents verifies that objects have parent scopes or not
1877 // as specified by the Object interface.
1878 func TestObjectParents(t *testing.T) {
1897 func f(x int) { y := x; print(y) }
1900 fset := token.NewFileSet()
1901 f, err := parser.ParseFile(fset, "src", src, 0)
1907 Defs: make(map[*ast.Ident]Object),
1909 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
1913 for ident, obj := range info.Defs {
1915 // only package names and implicit vars have a nil object
1916 // (in this test we only need to handle the package name)
1917 if ident.Name != "p" {
1918 t.Errorf("%v has nil object", ident)
1923 // struct fields, type-associated and interface methods
1924 // have no parent scope
1926 switch obj := obj.(type) {
1932 if obj.Type().(*Signature).Recv() != nil { // method
1937 gotParent := obj.Parent() != nil
1939 case gotParent && !wantParent:
1940 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
1941 case !gotParent && wantParent:
1942 t.Errorf("%v: no parent found", ident)
1947 // TestFailedImport tests that we don't get follow-on errors
1948 // elsewhere in a package due to failing to import a package.
1949 func TestFailedImport(t *testing.T) {
1950 testenv.MustHaveGoBuild(t)
1955 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
1960 func f(x T) T { return foo.F(x) }
1962 fset := token.NewFileSet()
1963 f, err := parser.ParseFile(fset, "src", src, 0)
1967 files := []*ast.File{f}
1969 // type-check using all possible importers
1970 for _, compiler := range []string{"gc", "gccgo", "source"} {
1973 Error: func(err error) {
1974 // we should only see the import error
1975 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
1976 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
1980 Importer: importer.For(compiler, nil),
1984 Uses: make(map[*ast.Ident]Object),
1986 pkg, _ := conf.Check("p", fset, files, info)
1988 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
1992 imports := pkg.Imports()
1993 if len(imports) != 1 {
1994 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
1998 if imp.Name() != "foo" {
1999 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2003 // verify that all uses of foo refer to the imported package foo (imp)
2004 for ident, obj := range info.Uses {
2005 if ident.Name == "foo" {
2006 if obj, ok := obj.(*PkgName); ok {
2007 if obj.Imported() != imp {
2008 t.Errorf("%s resolved to %v; want %v", ident, obj.Imported(), imp)
2011 t.Errorf("%s resolved to %v; want package name", ident, obj)
2018 func TestInstantiate(t *testing.T) {
2019 // eventually we like more tests but this is a start
2020 const src = "package p; type T[P any] *T[P]"
2021 pkg, err := pkgForMode(".", src, nil, 0)
2026 // type T should have one type parameter
2027 T := pkg.Scope().Lookup("T").Type().(*Named)
2028 if n := T.TypeParams().Len(); n != 1 {
2029 t.Fatalf("expected 1 type parameter; found %d", n)
2032 // instantiation should succeed (no endless recursion)
2033 // even with a nil *Checker
2034 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2039 // instantiated type should point to itself
2040 if p := res.Underlying().(*Pointer).Elem(); p != res {
2041 t.Fatalf("unexpected result type: %s points to %s", res, p)
2045 func TestInstantiateErrors(t *testing.T) {
2047 src string // by convention, T must be the type being instantiated
2049 wantAt int // -1 indicates no error
2051 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2052 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2053 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2054 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2057 for _, test := range tests {
2058 src := "package p; " + test.src
2059 pkg, err := pkgForMode(".", src, nil, 0)
2064 T := pkg.Scope().Lookup("T").Type().(*Named)
2066 _, err = Instantiate(nil, T, test.targs, true)
2068 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2071 var argErr *ArgumentError
2072 if !errors.As(err, &argErr) {
2073 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2076 if argErr.Index != test.wantAt {
2077 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2082 func TestArgumentErrorUnwrapping(t *testing.T) {
2083 var err error = &ArgumentError{
2085 Err: Error{Msg: "test"},
2088 if !errors.As(err, &e) {
2089 t.Fatalf("error %v does not wrap types.Error", err)
2091 if e.Msg != "test" {
2092 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2096 func TestInstanceIdentity(t *testing.T) {
2097 imports := make(testImporter)
2098 conf := Config{Importer: imports}
2099 makePkg := func(src string) {
2100 fset := token.NewFileSet()
2101 f, err := parser.ParseFile(fset, "", src, 0)
2106 pkg, err := conf.Check(name, fset, []*ast.File{f}, nil)
2112 makePkg(genericPkg + `lib; type T[P any] struct{}`)
2113 makePkg(genericPkg + `a; import "generic_lib"; var A generic_lib.T[int]`)
2114 makePkg(genericPkg + `b; import "generic_lib"; var B generic_lib.T[int]`)
2115 a := imports["generic_a"].Scope().Lookup("A")
2116 b := imports["generic_b"].Scope().Lookup("B")
2117 if !Identical(a.Type(), b.Type()) {
2118 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2122 func TestImplements(t *testing.T) {
2126 type EmptyIface interface{}
2137 type Integer interface{
2138 int8 | int16 | int32 | int64
2141 type EmptyTypeSet interface{
2158 type Bad Bad // invalid type
2161 fset := token.NewFileSet()
2162 f, err := parser.ParseFile(fset, "p.go", src, 0)
2166 conf := Config{Error: func(error) {}}
2167 pkg, _ := conf.Check(f.Name.Name, fset, []*ast.File{f}, nil)
2169 scope := pkg.Scope()
2171 EmptyIface = scope.Lookup("EmptyIface").Type().Underlying().(*Interface)
2172 I = scope.Lookup("I").Type().(*Named)
2173 II = I.Underlying().(*Interface)
2174 C = scope.Lookup("C").Type().(*Named)
2175 CI = C.Underlying().(*Interface)
2176 Integer = scope.Lookup("Integer").Type().Underlying().(*Interface)
2177 EmptyTypeSet = scope.Lookup("EmptyTypeSet").Type().Underlying().(*Interface)
2178 N1 = scope.Lookup("N1").Type()
2179 N1p = NewPointer(N1)
2180 N2 = scope.Lookup("N2").Type()
2181 N2p = NewPointer(N2)
2182 N3 = scope.Lookup("N3").Type()
2183 N4 = scope.Lookup("N4").Type()
2184 Bad = scope.Lookup("Bad").Type()
2196 {Typ[Int8], Integer, true},
2197 {Typ[Int64], Integer, true},
2198 {Typ[String], Integer, false},
2199 {EmptyTypeSet, II, true},
2200 {EmptyTypeSet, EmptyTypeSet, true},
2201 {Typ[Int], EmptyTypeSet, false},
2216 {Bad, EmptyIface, true},
2219 for _, test := range tests {
2220 if got := Implements(test.t, test.i); got != test.want {
2221 t.Errorf("Implements(%s, %s) = %t, want %t", test.t, test.i, got, test.want)