1 // Copyright 2013 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
9 "cmd/compile/internal/syntax"
18 . "cmd/compile/internal/types2"
21 // brokenPkg is a source prefix for packages that are not expected to parse
22 // or type-check cleanly. They are always parsed assuming that they contain
24 const brokenPkg = "package broken_"
26 func parseSrc(path, src string) (*syntax.File, error) {
27 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
28 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, syntax.AllowGenerics|syntax.AllowMethodTypeParams)
31 func pkgFor(path, source string, info *Info) (*Package, error) {
32 f, err := parseSrc(path, source)
36 conf := Config{Importer: defaultImporter()}
37 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
40 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
41 pkg, err := pkgFor(path, source, info)
45 name = "package " + pkg.Name()
47 t.Fatalf("%s: didn't type-check (%s)", name, err)
52 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
53 f, err := parseSrc(path, source)
54 if f == nil { // ignore errors unless f is nil
55 t.Fatalf("%s: unable to parse: %s", path, err)
58 Error: func(err error) {},
59 Importer: defaultImporter(),
61 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
62 return pkg.Name(), err
65 func TestValuesInfo(t *testing.T) {
66 var tests = []struct {
68 expr string // constant expression
69 typ string // constant type
70 val string // constant value
72 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
73 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
74 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
75 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
76 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
77 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
79 {`package b0; var _ = false`, `false`, `bool`, `false`},
80 {`package b1; var _ = 0`, `0`, `int`, `0`},
81 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
82 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
83 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
84 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
86 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
87 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
88 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
90 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
91 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
92 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
94 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
95 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
96 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
98 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
99 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
100 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
102 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
103 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
104 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
106 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
107 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
108 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
109 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
110 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
111 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
113 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
114 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
115 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
116 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
118 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
119 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
120 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
121 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
122 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
123 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
124 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
125 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
127 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
128 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
129 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
130 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
131 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
132 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
133 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
134 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
135 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
136 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
140 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
141 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
144 for _, test := range tests {
146 Types: make(map[syntax.Expr]TypeAndValue),
148 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
150 // look for expression
152 for e := range info.Types {
153 if syntax.String(e) == test.expr {
159 t.Errorf("package %s: no expression found for %s", name, test.expr)
162 tv := info.Types[expr]
164 // check that type is correct
165 if got := tv.Type.String(); got != test.typ {
166 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
170 // if we have a constant, check that value is correct
172 if got := tv.Value.ExactString(); got != test.val {
173 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
177 t.Errorf("package %s: no constant found; want %s", name, test.val)
183 func TestTypesInfo(t *testing.T) {
184 var tests = []struct {
186 expr string // expression
187 typ string // value type
189 // single-valued expressions of untyped constants
190 {`package b0; var x interface{} = false`, `false`, `bool`},
191 {`package b1; var x interface{} = 0`, `0`, `int`},
192 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
193 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
194 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
197 {`package n0; var _ *int = nil`, `nil`, `*int`},
198 {`package n1; var _ func() = nil`, `nil`, `func()`},
199 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
200 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
201 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
202 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
203 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
204 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
206 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
207 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
208 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
209 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
210 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
211 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
212 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
213 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
215 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
216 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
217 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
218 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
219 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
220 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
221 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
222 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
224 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
225 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
226 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
227 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
228 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
229 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
230 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
231 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
233 // comma-ok expressions
234 {`package p0; var x interface{}; var _, _ = x.(int)`,
238 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
242 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
244 `(complex128, p2a.mybool)`,
246 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
248 `(complex128, bool)`,
250 {`package p3; var c chan string; var _, _ = <-c`,
256 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
260 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
264 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
268 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
272 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
278 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
282 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
286 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
290 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
294 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
298 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
304 {`package issue28277_a; func f(...int)`,
308 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
313 // tests for broken code that doesn't parse or type-check
314 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
315 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
316 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
317 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
318 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
319 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
321 // parameterized functions
322 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
323 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
324 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
325 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
326 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
327 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
330 {`package t0; type t[] int; var _ t`, `t`, `t0.t`}, // t[] is a syntax error that is ignored in this test in favor of t
331 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
332 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
333 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
334 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
336 // instantiated types must be sanitized
337 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
340 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
343 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
346 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
347 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
348 {`package u2a; func _[_ interface{int|string}]() {}`, `int | string`, `int|string`},
349 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string | ~bool`, `int|string|~bool`},
350 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string`, `int|string`},
351 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `~bool`, `~bool`},
352 {`package u3a; func _[_ interface{int|string|~float64|~bool}]() {}`, `int | string | ~float64`, `int|string|~float64`},
354 {`package u0b; func _[_ int]() {}`, `int`, `int`},
355 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
356 {`package u2b; func _[_ int|string]() {}`, `int | string`, `int|string`},
357 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string | ~bool`, `int|string|~bool`},
358 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string`, `int|string`},
359 {`package u3b; func _[_ int|string|~bool]() {}`, `~bool`, `~bool`},
360 {`package u3b; func _[_ int|string|~float64|~bool]() {}`, `int | string | ~float64`, `int|string|~float64`},
362 {`package u0c; type _ interface{int}`, `int`, `int`},
363 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
364 {`package u2c; type _ interface{int|string}`, `int | string`, `int|string`},
365 {`package u3c; type _ interface{int|string|~bool}`, `int | string | ~bool`, `int|string|~bool`},
366 {`package u3c; type _ interface{int|string|~bool}`, `int | string`, `int|string`},
367 {`package u3c; type _ interface{int|string|~bool}`, `~bool`, `~bool`},
368 {`package u3c; type _ interface{int|string|~float64|~bool}`, `int | string | ~float64`, `int|string|~float64`},
371 for _, test := range tests {
372 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
374 if strings.HasPrefix(test.src, brokenPkg) {
376 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
378 t.Errorf("package %s: expected to fail but passed", name)
382 name = mustTypecheck(t, "TypesInfo", test.src, &info)
385 // look for expression type
387 for e, tv := range info.Types {
388 if syntax.String(e) == test.expr {
394 t.Errorf("package %s: no type found for %s", name, test.expr)
398 // check that type is correct
399 if got := typ.String(); got != test.typ {
400 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
405 func TestInstanceInfo(t *testing.T) {
406 var tests = []struct {
412 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
417 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
422 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
424 []string{`complex128`},
425 `func(...complex128) complex128`,
427 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
429 []string{`float64`, `string`, `byte`},
430 `func(float64, *string, []byte)`,
432 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
434 []string{`float64`, `byte`},
435 `func(float64, *byte, ...[]byte)`,
438 // we don't know how to translate these but we can type-check them
439 {`package q0; type T struct{}; func (T) m[P any](P) {}; func _(x T) { x.m(42) }`,
444 {`package q1; type T struct{}; func (T) m[P any](P) P { panic(0) }; func _(x T) { x.m(42) }`,
449 {`package q2; type T struct{}; func (T) m[P any](...P) P { panic(0) }; func _(x T) { x.m(42) }`,
454 {`package q3; type T struct{}; func (T) m[A, B, C any](A, *B, []C) {}; func _(x T) { x.m(1.2, new(string), []byte{}) }`,
456 []string{`float64`, `string`, `byte`},
457 `func(float64, *string, []byte)`,
459 {`package q4; type T struct{}; func (T) m[A, B any](A, *B, ...[]B) {}; func _(x T) { x.m(1.2, new(byte)) }`,
461 []string{`float64`, `byte`},
462 `func(float64, *byte, ...[]byte)`,
465 {`package r0; type T[P any] struct{}; func (_ T[P]) m[Q any](Q) {}; func _[P any](x T[P]) { x.m(42) }`,
470 // TODO(gri) record method type parameters in syntax.FuncType so we can check this
471 // {`package r1; type T interface{ m[P any](P) }; func _(x T) { x.m(4.2) }`,
473 // []string{`float64`},
477 {`package s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
479 []string{`string`, `*string`},
482 {`package s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
484 []string{`int`, `*int`},
487 {`package s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
489 []string{`int`, `chan<- int`},
492 {`package s4; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]](x []T) {}; func _(x []int) { f(x) }`,
494 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
498 {`package t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
500 []string{`string`, `*string`},
503 {`package t2; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
505 []string{`string`, `*string`},
508 {`package t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
510 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
513 {`package t4; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
515 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
518 {`package i0; import lib "generic_lib"; func _() { lib.F(42) }`,
523 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
528 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
533 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
538 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
540 []string{`[]int`, `int`},
541 `struct{x []int; y int}`,
543 {`package type4; import lib "generic_lib"; var _ lib.T[int]`,
550 for _, test := range tests {
551 const lib = `package generic_lib
558 imports := make(testImporter)
559 conf := Config{Importer: imports}
560 instances := make(map[*syntax.Name]Instance)
561 uses := make(map[*syntax.Name]Object)
562 makePkg := func(src string) *Package {
563 f, err := parseSrc("p.go", src)
567 pkg, err := conf.Check("", []*syntax.File{f}, &Info{Instances: instances, Uses: uses})
571 imports[pkg.Name()] = pkg
575 pkg := makePkg(test.src)
577 // look for instance information
580 for ident, inst := range instances {
581 if syntax.String(ident) == test.name {
582 for i := 0; i < inst.TypeArgs.Len(); i++ {
583 targs = append(targs, inst.TypeArgs.At(i))
587 // Check that we can find the corresponding parameterized type.
588 ptype := uses[ident].Type()
589 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
590 if lister == nil || lister.TypeParams().Len() == 0 {
591 t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
595 // Verify the invariant that re-instantiating the generic type with
596 // TypeArgs results in an equivalent type.
597 inst2, err := Instantiate(nil, ptype, targs, true)
599 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
601 if !Identical(inst.Type, inst2) {
602 t.Errorf("%v and %v are not identical", inst.Type, inst2)
608 t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
612 // check that type arguments are correct
613 if len(targs) != len(test.targs) {
614 t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
617 for i, targ := range targs {
618 if got := targ.String(); got != test.targs[i] {
619 t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
624 // check that the types match
625 if got := typ.Underlying().String(); got != test.typ {
626 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, test.typ)
631 func TestDefsInfo(t *testing.T) {
632 var tests = []struct {
637 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
638 {`package p1; const x int = 42`, `x`, `const p1.x int`},
639 {`package p2; var x int`, `x`, `var p2.x int`},
640 {`package p3; type x int`, `x`, `type p3.x int`},
641 {`package p4; func f()`, `f`, `func p4.f()`},
642 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
644 // Tests using generics.
645 {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
646 {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
647 {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
650 for _, test := range tests {
652 Defs: make(map[*syntax.Name]Object),
654 name := mustTypecheck(t, "DefsInfo", test.src, &info)
658 for id, obj := range info.Defs {
659 if id.Value == test.obj {
665 t.Errorf("package %s: %s not found", name, test.obj)
669 if got := def.String(); got != test.want {
670 t.Errorf("package %s: got %s; want %s", name, got, test.want)
675 func TestUsesInfo(t *testing.T) {
676 var tests = []struct {
681 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
682 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
683 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
684 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
685 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
687 // Tests using generics.
688 {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
689 {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
690 {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
691 {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
693 // Uses of fields are instantiated.
694 {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
695 {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
697 // Uses of methods are uses of the instantiated method.
698 {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
699 {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
702 for _, test := range tests {
704 Uses: make(map[*syntax.Name]Object),
706 name := mustTypecheck(t, "UsesInfo", test.src, &info)
710 for id, obj := range info.Uses {
711 if id.Value == test.obj {
717 t.Errorf("package %s: %s not found", name, test.obj)
721 if got := use.String(); got != test.want {
722 t.Errorf("package %s: got %s; want %s", name, got, test.want)
727 func TestGenericMethodInfo(t *testing.T) {
732 func (r N[B]) m() { r.m(); r.n() }
734 func (r *N[C]) n() { }
736 f, err := parseSrc("p.go", src)
741 Defs: make(map[*syntax.Name]Object),
742 Uses: make(map[*syntax.Name]Object),
743 Selections: make(map[*syntax.SelectorExpr]*Selection),
746 pkg, err := conf.Check("p", []*syntax.File{f}, &info)
751 N := pkg.Scope().Lookup("N").Type().(*Named)
753 // Find the generic methods stored on N.
754 gm, gn := N.Method(0), N.Method(1)
755 if gm.Name() == "n" {
759 // Collect objects from info.
760 var dm, dn *Func // the declared methods
761 var dmm, dmn *Func // the methods used in the body of m
762 for _, decl := range f.DeclList {
763 fdecl, ok := decl.(*syntax.FuncDecl)
767 def := info.Defs[fdecl.Name].(*Func)
768 switch fdecl.Name.Value {
771 syntax.Inspect(fdecl.Body, func(n syntax.Node) bool {
772 if call, ok := n.(*syntax.CallExpr); ok {
773 sel := call.Fun.(*syntax.SelectorExpr)
774 use := info.Uses[sel.Sel].(*Func)
775 selection := info.Selections[sel]
776 if selection.Kind() != MethodVal {
777 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
779 if selection.Obj() != use {
780 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
782 switch sel.Sel.Value {
797 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
800 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
803 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
806 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
810 func TestImplicitsInfo(t *testing.T) {
811 testenv.MustHaveGoBuild(t)
813 var tests = []struct {
817 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
818 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
819 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
821 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
822 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
823 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
824 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
826 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
827 {`package p8; func f(int) {}`, "field: var int"},
828 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
829 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
831 // Tests using generics.
832 {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
833 {`package f1; func f[T any](int) {}`, "field: var int"},
834 {`package f2; func f[T any](T) {}`, "field: var T"},
835 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
836 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
837 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
838 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
839 {`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]"},
840 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
843 for _, test := range tests {
845 Implicits: make(map[syntax.Node]Object),
847 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
849 // the test cases expect at most one Implicits entry
850 if len(info.Implicits) > 1 {
851 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
855 // extract Implicits entry, if any
857 for n, obj := range info.Implicits {
858 switch x := n.(type) {
859 case *syntax.ImportDecl:
861 case *syntax.CaseClause:
866 t.Fatalf("package %s: unexpected %T", name, x)
868 got += ": " + obj.String()
872 if got != test.want {
873 t.Errorf("package %s: got %q; want %q", name, got, test.want)
878 func predString(tv TypeAndValue) string {
880 pred := func(b bool, s string) {
883 buf.WriteString(", ")
889 pred(tv.IsVoid(), "void")
890 pred(tv.IsType(), "type")
891 pred(tv.IsBuiltin(), "builtin")
892 pred(tv.IsValue() && tv.Value != nil, "const")
893 pred(tv.IsValue() && tv.Value == nil, "value")
894 pred(tv.IsNil(), "nil")
895 pred(tv.Addressable(), "addressable")
896 pred(tv.Assignable(), "assignable")
897 pred(tv.HasOk(), "hasOk")
905 func TestPredicatesInfo(t *testing.T) {
906 testenv.MustHaveGoBuild(t)
908 var tests = []struct {
914 {`package n0; func f() { f() }`, `f()`, `void`},
917 {`package t0; type _ int`, `int`, `type`},
918 {`package t1; type _ []int`, `[]int`, `type`},
919 {`package t2; type _ func()`, `func()`, `type`},
920 {`package t3; type _ func(int)`, `int`, `type`},
921 {`package t3; type _ func(...int)`, `...int`, `type`},
924 {`package b0; var _ = len("")`, `len`, `builtin`},
925 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
928 {`package c0; var _ = 42`, `42`, `const`},
929 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
930 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
933 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
934 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
935 {`package v2; var _ = func(){}`, `func() {}`, `value`},
936 {`package v4; func f() { _ = f }`, `f`, `value`},
937 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
938 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
940 // addressable (and thus assignable) operands
941 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
942 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
943 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
944 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
945 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
946 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
947 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
948 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
949 // composite literals are not addressable
951 // assignable but not addressable values
952 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
953 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
956 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
957 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
960 // - package names are collected in the Uses map
961 // - identifiers being declared are collected in the Defs map
962 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
963 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
964 {`package m2; const c = 0`, `c`, `<missing>`},
965 {`package m3; type T int`, `T`, `<missing>`},
966 {`package m4; var v int`, `v`, `<missing>`},
967 {`package m5; func f() {}`, `f`, `<missing>`},
968 {`package m6; func _(x int) {}`, `x`, `<missing>`},
969 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
970 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
973 for _, test := range tests {
974 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
975 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
977 // look for expression predicates
979 for e, tv := range info.Types {
980 //println(name, syntax.String(e))
981 if syntax.String(e) == test.expr {
987 if got != test.pred {
988 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
993 func TestScopesInfo(t *testing.T) {
994 testenv.MustHaveGoBuild(t)
996 var tests = []struct {
998 scopes []string // list of scope descriptors of the form kind:varlist
1000 {`package p0`, []string{
1003 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1006 {`package p2; func _() {}`, []string{
1009 {`package p3; func _(x, y int) {}`, []string{
1010 "file:", "func:x y",
1012 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1013 "file:", "func:x y z", // redeclaration of x
1015 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1016 "file:", "func:u x y",
1018 {`package p6; func _() { { var x int; _ = x } }`, []string{
1019 "file:", "func:", "block:x",
1021 {`package p7; func _() { if true {} }`, []string{
1022 "file:", "func:", "if:", "block:",
1024 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1025 "file:", "func:", "if:x", "block:y",
1027 {`package p9; func _() { switch x := 0; x {} }`, []string{
1028 "file:", "func:", "switch:x",
1030 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1031 "file:", "func:", "switch:x", "case:y", "case:",
1033 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1034 "file:", "func:t", "switch:",
1036 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1037 "file:", "func:t", "switch:t",
1039 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1040 "file:", "func:t", "switch:", "case:x", // x implicitly declared
1042 {`package p14; func _() { select{} }`, []string{
1045 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1046 "file:", "func:c", "comm:",
1048 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1049 "file:", "func:c", "comm:i x",
1051 {`package p17; func _() { for{} }`, []string{
1052 "file:", "func:", "for:", "block:",
1054 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1055 "file:", "func:n", "for:i", "block:",
1057 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1058 "file:", "func:a", "for:i", "block:",
1060 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1061 "file:", "func:a", "for:i x", "block:",
1065 for _, test := range tests {
1066 info := Info{Scopes: make(map[syntax.Node]*Scope)}
1067 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
1069 // number of scopes must match
1070 if len(info.Scopes) != len(test.scopes) {
1071 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1074 // scope descriptions must match
1075 for node, scope := range info.Scopes {
1077 switch node.(type) {
1080 case *syntax.FuncType:
1082 case *syntax.BlockStmt:
1084 case *syntax.IfStmt:
1086 case *syntax.SwitchStmt:
1088 case *syntax.SelectStmt:
1090 case *syntax.CaseClause:
1092 case *syntax.CommClause:
1094 case *syntax.ForStmt:
1097 kind = fmt.Sprintf("%T", node)
1100 // look for matching scope description
1101 desc := kind + ":" + strings.Join(scope.Names(), " ")
1103 for _, d := range test.scopes {
1110 t.Errorf("package %s: no matching scope found for %s", name, desc)
1116 func TestInitOrderInfo(t *testing.T) {
1117 var tests = []struct {
1121 {`package p0; var (x = 1; y = x)`, []string{
1124 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1125 "a = 1", "b = 2", "c = 3",
1127 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1128 "a = 1", "b = 2", "c = 3",
1130 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1131 "_ = f()", // blank var
1133 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1134 "a = 0", "z = 0", "y = z", "x = y",
1136 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1137 "a, _ = m[0]", // blank var
1139 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1140 "z = 0", "a, b = f()",
1142 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1143 "b = 1", "a = func() int {…}()",
1145 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1146 "c = 1", "a, b = func() (_, _ int) {…}()",
1148 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1151 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1152 "a = 0", "b = 0", "c = 0", "d = c + b",
1154 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1155 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1157 // emit an initializer for n:1 initializations only once (not for each node
1158 // on the lhs which may appear in different order in the dependency graph)
1159 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1160 "b = 0", "x, y = m[0]", "a = x",
1162 // test case from spec section on package initialization
1176 "d = 3", "b = f()", "c = f()", "a = c + b",
1178 // test case for issue 7131
1182 func next() int { counter++; return counter }
1185 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1188 var b, c = next(), next()
1189 var d, e, f = next(), next(), next()
1191 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1193 // test case for issue 10709
1203 func (T) m() int { return 0 }
1205 func makeT(n int) T {
1211 "t = makeT(0)", "v = t.m()",
1213 // test case for issue 10709: same as test before, but variable decls swapped
1223 func (T) m() int { return 0 }
1225 func makeT(n int) T {
1231 "t = makeT(0)", "v = t.m()",
1233 // another candidate possibly causing problems with issue 10709
1238 func f1() int { return g1() }
1239 func g1() int { f1(); return x1 }
1245 func f2() int { return g2() }
1246 func g2() int { return x2 }
1248 var x2 = 0`, []string{
1249 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1253 for _, test := range tests {
1255 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1257 // number of initializers must match
1258 if len(info.InitOrder) != len(test.inits) {
1259 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1263 // initializers must match
1264 for i, want := range test.inits {
1265 got := info.InitOrder[i].String()
1267 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1274 func TestMultiFileInitOrder(t *testing.T) {
1275 mustParse := func(src string) *syntax.File {
1276 f, err := parseSrc("main", src)
1283 fileA := mustParse(`package main; var a = 1`)
1284 fileB := mustParse(`package main; var b = 2`)
1286 // The initialization order must not depend on the parse
1287 // order of the files, only on the presentation order to
1288 // the type-checker.
1289 for _, test := range []struct {
1290 files []*syntax.File
1293 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1294 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1297 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1300 if got := fmt.Sprint(info.InitOrder); got != test.want {
1301 t.Fatalf("got %s; want %s", got, test.want)
1306 func TestFiles(t *testing.T) {
1307 var sources = []string{
1308 "package p; type T struct{}; func (T) m1() {}",
1309 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1310 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1315 pkg := NewPackage("p", "p")
1317 check := NewChecker(&conf, pkg, &info)
1319 for i, src := range sources {
1320 filename := fmt.Sprintf("sources%d", i)
1321 f, err := parseSrc(filename, src)
1325 if err := check.Files([]*syntax.File{f}); err != nil {
1330 // check InitOrder is [x y]
1332 for _, init := range info.InitOrder {
1333 for _, v := range init.Lhs {
1334 vars = append(vars, v.Name())
1337 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1338 t.Errorf("InitOrder == %s, want %s", got, want)
1342 type testImporter map[string]*Package
1344 func (m testImporter) Import(path string) (*Package, error) {
1345 if pkg := m[path]; pkg != nil {
1348 return nil, fmt.Errorf("package %q not found", path)
1351 func TestSelection(t *testing.T) {
1352 selections := make(map[*syntax.SelectorExpr]*Selection)
1354 imports := make(testImporter)
1355 conf := Config{Importer: imports}
1356 makePkg := func(path, src string) {
1357 f, err := parseSrc(path+".go", src)
1361 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1399 // qualified identifiers
1433 // method expressions
1440 wantOut := map[string][2]string{
1441 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1443 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1444 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1445 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1446 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1447 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1448 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1449 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1450 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1452 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1453 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1454 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1455 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1456 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1457 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1458 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1459 "C{}.g": {"method (main.C) g()", ".[0]"},
1460 "new(C).g": {"method (*main.C) g()", "->[0]"},
1461 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1463 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1464 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1465 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1466 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1469 makePkg("lib", libSrc)
1470 makePkg("main", mainSrc)
1472 for e, sel := range selections {
1473 _ = sel.String() // assertion: must not panic
1475 start := indexFor(mainSrc, syntax.StartPos(e))
1476 end := indexFor(mainSrc, syntax.EndPos(e))
1477 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1485 fmt.Sprintf("%s%v", direct, sel.Index()),
1487 want := wantOut[segment]
1489 t.Errorf("%s: got %q; want %q", segment, got, want)
1491 delete(wantOut, segment)
1493 // We must explicitly assert properties of the
1494 // Signature's receiver since it doesn't participate
1495 // in Identical() or String().
1496 sig, _ := sel.Type().(*Signature)
1497 if sel.Kind() == MethodVal {
1498 got := sig.Recv().Type()
1500 if !Identical(got, want) {
1501 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1503 } else if sig != nil && sig.Recv() != nil {
1504 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1507 // Assert that all wantOut entries were used exactly once.
1508 for segment := range wantOut {
1509 t.Errorf("no syntax.Selection found with syntax %q", segment)
1513 // indexFor returns the index into s corresponding to the position pos.
1514 func indexFor(s string, pos syntax.Pos) int {
1515 i, line := 0, 1 // string index and corresponding line
1516 target := int(pos.Line())
1517 for line < target && i < len(s) {
1523 return i + int(pos.Col()-1) // columns are 1-based
1526 func TestIssue8518(t *testing.T) {
1527 imports := make(testImporter)
1529 Error: func(err error) { t.Log(err) }, // don't exit after first error
1532 makePkg := func(path, src string) {
1533 f, err := parseSrc(path, src)
1537 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1545 const C2 = missing.C
1555 makePkg("a", libSrc)
1556 makePkg("main", mainSrc) // don't crash when type-checking this package
1559 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1560 // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
1562 const want = "LookupFieldOrMethod on nil type"
1564 if s, ok := p.(string); !ok || s != want {
1565 t.Fatalf("got %v, want %s", p, want)
1568 LookupFieldOrMethod(nil, false, nil, "")
1571 func TestLookupFieldOrMethod(t *testing.T) {
1572 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1573 // addressable value, and x for a non-addressable value (even though a variable
1574 // for ease of test case writing).
1575 var tests = []struct {
1582 {"var x T; type T struct{}", false, nil, false},
1583 {"var x T; type T struct{ f int }", true, []int{0}, false},
1584 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1587 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1588 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1589 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1590 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1593 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1594 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1596 // outside methodset
1597 // (*T).f method exists, but value of type T is not addressable
1598 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1601 for _, test := range tests {
1602 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1604 t.Errorf("%s: incorrect test case: %s", test.src, err)
1608 obj := pkg.Scope().Lookup("a")
1610 if obj = pkg.Scope().Lookup("x"); obj == nil {
1611 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1616 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1617 if (f != nil) != test.found {
1619 t.Errorf("%s: got no object; want one", test.src)
1621 t.Errorf("%s: got object = %v; want none", test.src, f)
1624 if !sameSlice(index, test.index) {
1625 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1627 if indirect != test.indirect {
1628 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1633 func sameSlice(a, b []int) bool {
1634 if len(a) != len(b) {
1637 for i, x := range a {
1645 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1646 // the correct result at various positions within the source.
1647 func TestScopeLookupParent(t *testing.T) {
1648 imports := make(testImporter)
1649 conf := Config{Importer: imports}
1651 makePkg := func(path, src string) {
1652 f, err := parseSrc(path, src)
1656 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1662 makePkg("lib", "package lib; var X int")
1663 // Each /*name=kind:line*/ comment makes the test look up the
1664 // name at that point and checks that it resolves to a decl of
1665 // the specified kind and line number. "undef" means undefined.
1667 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1678 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1679 type /*t=undef*/ t /*t=typename:14*/ *t
1680 print(Y) /*Y=var:10*/
1681 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1682 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1685 for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
1688 switch y := i.(type) { /*y=undef*/
1689 case /*y=undef*/ int /*y=var:23*/ :
1690 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1691 default /*y=var:23*/:
1696 switch int := i.(type) {
1697 case /*int=typename:0*/ int /*int=var:31*/ :
1699 default /*int=var:31*/ :
1705 info.Uses = make(map[*syntax.Name]Object)
1706 makePkg("main", mainSrc)
1707 mainScope := imports["main"].Scope()
1709 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1711 base := syntax.NewFileBase("main")
1712 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1713 pos := syntax.MakePos(base, line, col)
1715 // Syntax errors are not comments.
1717 t.Errorf("%s: %s", pos, text)
1721 // Parse the assertion in the comment.
1722 m := rx.FindStringSubmatch(text)
1724 t.Errorf("%s: bad comment: %s", pos, text)
1727 name, want := m[1], m[2]
1729 // Look up the name in the innermost enclosing scope.
1730 inner := mainScope.Innermost(pos)
1732 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1736 if _, obj := inner.LookupParent(name, pos); obj != nil {
1737 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1738 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1741 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1745 // Check that for each referring identifier,
1746 // a lookup of its name on the innermost
1747 // enclosing scope returns the correct object.
1749 for id, wantObj := range info.Uses {
1750 inner := mainScope.Innermost(id.Pos())
1752 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1756 // Exclude selectors and qualified identifiers---lexical
1757 // refs only. (Ideally, we'd see if the AST parent is a
1758 // SelectorExpr, but that requires PathEnclosingInterval
1759 // from golang.org/x/tools/go/ast/astutil.)
1760 if id.Value == "X" {
1764 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1765 if gotObj != wantObj {
1766 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1772 var nopos syntax.Pos
1774 // newDefined creates a new defined type named T with the given underlying type.
1775 func newDefined(underlying Type) *Named {
1776 tname := NewTypeName(nopos, nil, "T", nil)
1777 return NewNamed(tname, underlying, nil)
1780 func TestConvertibleTo(t *testing.T) {
1781 for _, test := range []struct {
1785 {Typ[Int], Typ[Int], true},
1786 {Typ[Int], Typ[Float32], true},
1787 {Typ[Int], Typ[String], true},
1788 {newDefined(Typ[Int]), Typ[Int], true},
1789 {newDefined(new(Struct)), new(Struct), true},
1790 {newDefined(Typ[Int]), new(Struct), false},
1791 {Typ[UntypedInt], Typ[Int], true},
1792 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1793 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1794 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1795 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1796 {Typ[UntypedString], Typ[String], true},
1798 if got := ConvertibleTo(test.v, test.t); got != test.want {
1799 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1804 func TestAssignableTo(t *testing.T) {
1805 for _, test := range []struct {
1809 {Typ[Int], Typ[Int], true},
1810 {Typ[Int], Typ[Float32], false},
1811 {newDefined(Typ[Int]), Typ[Int], false},
1812 {newDefined(new(Struct)), new(Struct), true},
1813 {Typ[UntypedBool], Typ[Bool], true},
1814 {Typ[UntypedString], Typ[Bool], false},
1815 // Neither untyped string nor untyped numeric assignments arise during
1816 // normal type checking, so the below behavior is technically undefined by
1818 {Typ[UntypedString], Typ[String], true},
1819 {Typ[UntypedInt], Typ[Int], true},
1821 if got := AssignableTo(test.v, test.t); got != test.want {
1822 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1827 func TestIdentical(t *testing.T) {
1828 // For each test, we compare the types of objects X and Y in the source.
1834 {"var X int; var Y int", true},
1835 {"var X int; var Y string", false},
1837 // TODO: add more tests for complex types.
1840 {"type X int; type Y int", false},
1843 {"type X = int; type Y = int", true},
1846 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1847 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1848 {`func X(int) string { return "" }; func Y(int) {}`, false},
1850 // Generic functions. Type parameters should be considered identical modulo
1851 // renaming. See also issue #49722.
1852 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1853 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1854 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1855 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1856 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1857 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1860 for _, test := range tests {
1861 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1863 t.Errorf("%s: incorrect test case: %s", test.src, err)
1866 X := pkg.Scope().Lookup("X")
1867 Y := pkg.Scope().Lookup("Y")
1868 if X == nil || Y == nil {
1869 t.Fatal("test must declare both X and Y")
1871 if got := Identical(X.Type(), Y.Type()); got != test.want {
1872 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1877 func TestIdentical_issue15173(t *testing.T) {
1878 // Identical should allow nil arguments and be symmetric.
1879 for _, test := range []struct {
1883 {Typ[Int], Typ[Int], true},
1884 {Typ[Int], nil, false},
1885 {nil, Typ[Int], false},
1888 if got := Identical(test.x, test.y); got != test.want {
1889 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1894 func TestIdenticalUnions(t *testing.T) {
1895 tname := NewTypeName(nopos, nil, "myInt", nil)
1896 myInt := NewNamed(tname, Typ[Int], nil)
1897 tmap := map[string]*Term{
1898 "int": NewTerm(false, Typ[Int]),
1899 "~int": NewTerm(true, Typ[Int]),
1900 "string": NewTerm(false, Typ[String]),
1901 "~string": NewTerm(true, Typ[String]),
1902 "myInt": NewTerm(false, myInt),
1904 makeUnion := func(s string) *Union {
1905 parts := strings.Split(s, "|")
1907 for _, p := range parts {
1910 t.Fatalf("missing term %q", p)
1912 terms = append(terms, term)
1914 return NewUnion(terms)
1916 for _, test := range []struct {
1920 // These tests are just sanity checks. The tests for type sets and
1921 // interfaces provide much more test coverage.
1922 {"int|~int", "~int", true},
1923 {"myInt|~int", "~int", true},
1924 {"int|string", "string|int", true},
1925 {"int|int|string", "string|int", true},
1926 {"myInt|string", "int|string", false},
1928 x := makeUnion(test.x)
1929 y := makeUnion(test.y)
1930 if got := Identical(x, y); got != test.want {
1931 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1936 func TestIssue15305(t *testing.T) {
1937 const src = "package p; func f() int16; var _ = f(undef)"
1938 f, err := parseSrc("issue15305.go", src)
1943 Error: func(err error) {}, // allow errors
1946 Types: make(map[syntax.Expr]TypeAndValue),
1948 conf.Check("p", []*syntax.File{f}, info) // ignore result
1949 for e, tv := range info.Types {
1950 if _, ok := e.(*syntax.CallExpr); ok {
1951 if tv.Type != Typ[Int16] {
1952 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1957 t.Errorf("CallExpr has no type")
1960 // TestCompositeLitTypes verifies that Info.Types registers the correct
1961 // types for composite literal expressions and composite literal type
1963 func TestCompositeLitTypes(t *testing.T) {
1964 for _, test := range []struct {
1967 {`[16]byte{}`, `[16]byte`},
1968 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1969 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1970 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1971 {`[]int{}`, `[]int`},
1972 {`map[string]bool{"foo": true}`, `map[string]bool`},
1973 {`struct{}{}`, `struct{}`},
1974 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1976 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
1978 t.Fatalf("%s: %v", test.lit, err)
1982 Types: make(map[syntax.Expr]TypeAndValue),
1984 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1985 t.Fatalf("%s: %v", test.lit, err)
1988 cmptype := func(x syntax.Expr, want string) {
1989 tv, ok := info.Types[x]
1991 t.Errorf("%s: no Types entry found", test.lit)
1995 t.Errorf("%s: type is nil", test.lit)
1998 if got := tv.Type.String(); got != want {
1999 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2003 // test type of composite literal expression
2004 rhs := f.DeclList[0].(*syntax.VarDecl).Values
2005 cmptype(rhs, test.typ)
2007 // test type of composite literal type expression
2008 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
2012 // TestObjectParents verifies that objects have parent scopes or not
2013 // as specified by the Object interface.
2014 func TestObjectParents(t *testing.T) {
2033 func f(x int) { y := x; print(y) }
2036 f, err := parseSrc("src", src)
2042 Defs: make(map[*syntax.Name]Object),
2044 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2048 for ident, obj := range info.Defs {
2050 // only package names and implicit vars have a nil object
2051 // (in this test we only need to handle the package name)
2052 if ident.Value != "p" {
2053 t.Errorf("%v has nil object", ident)
2058 // struct fields, type-associated and interface methods
2059 // have no parent scope
2061 switch obj := obj.(type) {
2067 if obj.Type().(*Signature).Recv() != nil { // method
2072 gotParent := obj.Parent() != nil
2074 case gotParent && !wantParent:
2075 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2076 case !gotParent && wantParent:
2077 t.Errorf("%v: no parent found", ident)
2082 // TestFailedImport tests that we don't get follow-on errors
2083 // elsewhere in a package due to failing to import a package.
2084 func TestFailedImport(t *testing.T) {
2085 testenv.MustHaveGoBuild(t)
2090 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2095 func f(x T) T { return foo.F(x) }
2097 f, err := parseSrc("src", src)
2101 files := []*syntax.File{f}
2103 // type-check using all possible importers
2104 for _, compiler := range []string{"gc", "gccgo", "source"} {
2107 Error: func(err error) {
2108 // we should only see the import error
2109 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2110 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2114 //Importer: importer.For(compiler, nil),
2118 Uses: make(map[*syntax.Name]Object),
2120 pkg, _ := conf.Check("p", files, info)
2122 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2126 imports := pkg.Imports()
2127 if len(imports) != 1 {
2128 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2132 if imp.Name() != "foo" {
2133 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2137 // verify that all uses of foo refer to the imported package foo (imp)
2138 for ident, obj := range info.Uses {
2139 if ident.Value == "foo" {
2140 if obj, ok := obj.(*PkgName); ok {
2141 if obj.Imported() != imp {
2142 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
2145 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
2152 func TestInstantiate(t *testing.T) {
2153 // eventually we like more tests but this is a start
2154 const src = "package p; type T[P any] *T[P]"
2155 pkg, err := pkgFor(".", src, nil)
2160 // type T should have one type parameter
2161 T := pkg.Scope().Lookup("T").Type().(*Named)
2162 if n := T.TypeParams().Len(); n != 1 {
2163 t.Fatalf("expected 1 type parameter; found %d", n)
2166 // instantiation should succeed (no endless recursion)
2167 // even with a nil *Checker
2168 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2173 // instantiated type should point to itself
2174 if p := res.Underlying().(*Pointer).Elem(); p != res {
2175 t.Fatalf("unexpected result type: %s points to %s", res, p)
2179 func TestInstantiateErrors(t *testing.T) {
2181 src string // by convention, T must be the type being instantiated
2183 wantAt int // -1 indicates no error
2185 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2186 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2187 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2188 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2191 for _, test := range tests {
2192 src := "package p; " + test.src
2193 pkg, err := pkgFor(".", src, nil)
2198 T := pkg.Scope().Lookup("T").Type().(*Named)
2200 _, err = Instantiate(nil, T, test.targs, true)
2202 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2205 var argErr *ArgumentError
2206 if !errors.As(err, &argErr) {
2207 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2210 if argErr.Index != test.wantAt {
2211 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2216 func TestArgumentErrorUnwrapping(t *testing.T) {
2217 var err error = &ArgumentError{
2219 Err: Error{Msg: "test"},
2222 if !errors.As(err, &e) {
2223 t.Fatalf("error %v does not wrap types.Error", err)
2225 if e.Msg != "test" {
2226 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2230 func TestInstanceIdentity(t *testing.T) {
2231 imports := make(testImporter)
2232 conf := Config{Importer: imports}
2233 makePkg := func(src string) {
2234 f, err := parseSrc("", src)
2238 name := f.PkgName.Value
2239 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2245 makePkg(`package lib; type T[P any] struct{}`)
2246 makePkg(`package a; import "lib"; var A lib.T[int]`)
2247 makePkg(`package b; import "lib"; var B lib.T[int]`)
2248 a := imports["a"].Scope().Lookup("A")
2249 b := imports["b"].Scope().Lookup("B")
2250 if !Identical(a.Type(), b.Type()) {
2251 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2255 func TestImplements(t *testing.T) {
2259 type EmptyIface interface{}
2270 type Integer interface{
2271 int8 | int16 | int32 | int64
2274 type EmptyTypeSet interface{
2291 type Bad Bad // invalid type
2294 f, err := parseSrc("p.go", src)
2298 conf := Config{Error: func(error) {}}
2299 pkg, _ := conf.Check(f.PkgName.Value, []*syntax.File{f}, nil)
2301 scope := pkg.Scope()
2303 EmptyIface = scope.Lookup("EmptyIface").Type().Underlying().(*Interface)
2304 I = scope.Lookup("I").Type().(*Named)
2305 II = I.Underlying().(*Interface)
2306 C = scope.Lookup("C").Type().(*Named)
2307 CI = C.Underlying().(*Interface)
2308 Integer = scope.Lookup("Integer").Type().Underlying().(*Interface)
2309 EmptyTypeSet = scope.Lookup("EmptyTypeSet").Type().Underlying().(*Interface)
2310 N1 = scope.Lookup("N1").Type()
2311 N1p = NewPointer(N1)
2312 N2 = scope.Lookup("N2").Type()
2313 N2p = NewPointer(N2)
2314 N3 = scope.Lookup("N3").Type()
2315 N4 = scope.Lookup("N4").Type()
2316 Bad = scope.Lookup("Bad").Type()
2328 {Typ[Int8], Integer, true},
2329 {Typ[Int64], Integer, true},
2330 {Typ[String], Integer, false},
2331 {EmptyTypeSet, II, true},
2332 {EmptyTypeSet, EmptyTypeSet, true},
2333 {Typ[Int], EmptyTypeSet, false},
2348 {Bad, EmptyIface, true},
2351 for _, test := range tests {
2352 if got := Implements(test.t, test.i); got != test.want {
2353 t.Errorf("Implements(%s, %s) = %t, want %t", test.t, test.i, got, test.want)