package types_test
import (
- "bytes"
"errors"
"fmt"
"go/ast"
"go/importer"
- "go/internal/typeparams"
"go/parser"
"go/token"
+ "internal/goversion"
"internal/testenv"
"reflect"
"regexp"
+ "sort"
"strings"
+ "sync"
"testing"
. "go/types"
)
-// pkgFor parses and type checks the package specified by path and source,
-// populating info if provided.
-//
-// If source begins with "package generic_" and type parameters are enabled,
-// generic code is permitted.
-func pkgFor(path, source string, info *Info) (*Package, error) {
- fset := token.NewFileSet()
- mode := modeForSource(source)
- f, err := parser.ParseFile(fset, path, source, mode)
+// nopos indicates an unknown position
+var nopos token.Pos
+
+func mustParse(fset *token.FileSet, src string) *ast.File {
+ f, err := parser.ParseFile(fset, pkgName(src), src, 0)
if err != nil {
- return nil, err
+ panic(err) // so we don't need to pass *testing.T
}
- conf := Config{Importer: importer.Default()}
- return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
+ return f
}
-func mustTypecheck(t *testing.T, path, source string, info *Info) string {
- pkg, err := pkgFor(path, source, info)
- if err != nil {
- name := path
- if pkg != nil {
- name = "package " + pkg.Name()
+func typecheck(src string, conf *Config, info *Info) (*Package, error) {
+ fset := token.NewFileSet()
+ f := mustParse(fset, src)
+ if conf == nil {
+ conf = &Config{
+ Error: func(err error) {}, // collect all errors
+ Importer: importer.Default(),
}
- t.Fatalf("%s: didn't type-check (%s)", name, err)
}
- return pkg.Name()
+ return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
}
-// genericPkg is a prefix for packages that should be type checked with
-// generics.
-const genericPkg = "package generic_"
-
-func modeForSource(src string) parser.Mode {
- if !strings.HasPrefix(src, genericPkg) {
- return typeparams.DisallowParsing
+func mustTypecheck(src string, conf *Config, info *Info) *Package {
+ pkg, err := typecheck(src, conf, info)
+ if err != nil {
+ panic(err) // so we don't need to pass *testing.T
}
- return 0
+ return pkg
}
-func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
- fset := token.NewFileSet()
- mode := modeForSource(source)
- f, err := parser.ParseFile(fset, path, source, mode)
- if f == nil { // ignore errors unless f is nil
- t.Fatalf("%s: unable to parse: %s", path, err)
- }
- conf := Config{
- Error: func(err error) {},
- Importer: importer.Default(),
+// pkgName extracts the package name from src, which must contain a package header.
+func pkgName(src string) string {
+ const kw = "package "
+ if i := strings.Index(src, kw); i >= 0 {
+ after := src[i+len(kw):]
+ n := len(after)
+ if i := strings.IndexAny(after, "\n\t ;/"); i >= 0 {
+ n = i
+ }
+ return after[:n]
}
- pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
- return pkg.Name(), err
+ panic("missing package header: " + src)
}
func TestValuesInfo(t *testing.T) {
{`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
{`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
{`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
- {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``},
{`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
{`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
{`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
{`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
- {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
- {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
+ {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // go.dev/issue/22341
+ {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // go.dev/issue/48422
}
for _, test := range tests {
info := Info{
Types: make(map[ast.Expr]TypeAndValue),
}
- name := mustTypecheck(t, "ValuesInfo", test.src, &info)
+ name := mustTypecheck(test.src, nil, &info).Name()
// look for expression
var expr ast.Expr
`(string, bool)`,
},
- // issue 6796
+ // go.dev/issue/6796
{`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
`x.(int)`,
`(int, bool)`,
`(string, bool)`,
},
- // issue 7060
+ // go.dev/issue/7060
{`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
`m[0]`,
`(string, bool)`,
`(string, bool)`,
},
- // issue 28277
+ // go.dev/issue/28277
{`package issue28277_a; func f(...int)`,
`...int`,
`[]int`,
`[][]struct{}`,
},
- // issue 47243
+ // go.dev/issue/47243
{`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`},
- {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `uint`}, // issue 47410: should be untyped float
+ {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `untyped float`},
{`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`},
{`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`},
{`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`},
{`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`},
{`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`},
- // tests for broken code that doesn't parse or type-check
+ // tests for broken code that doesn't type-check
{broken + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
{broken + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
- {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a; f: b;}}`, `b`, `string`},
+ {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
{broken + `x3; var x = panic("");`, `panic`, `func(interface{})`},
{`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
- {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string][-1]int`},
+ {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
// parameterized functions
- {genericPkg + `p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T interface{}](T)`},
- {genericPkg + `p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
- {genericPkg + `p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
- {genericPkg + `p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
- {genericPkg + `p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T interface{}](T)`},
- {genericPkg + `p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
+ {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
+ {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
+ {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
+ {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
+ {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
+ {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
// type parameters
- {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
- {genericPkg + `t1; type t[P any] int; var _ t[int]`, `t`, `generic_t1.t[P interface{}]`},
- {genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[P interface{}]`},
- {genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[P, Q interface{}]`},
-
- // TODO (rFindley): compare with types2, which resolves the type broken_t4.t[P₁, Q₂ interface{m()}] here
- {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t`},
+ {`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
+ {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
+ {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
+ {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
+ {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
// instantiated types must be sanitized
- {genericPkg + `g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `generic_g0.t[int]`},
+ {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
- // issue 45096
- {genericPkg + `issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
+ // go.dev/issue/45096
+ {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
- // issue 47895
+ // go.dev/issue/47895
{`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
+
+ // go.dev/issue/50093
+ {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
+ {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
+ {`package u2a; func _[_ interface{int | string}]() {}`, `int | string`, `int | string`},
+ {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string | ~bool`, `int | string | ~bool`},
+ {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string`, `int | string`},
+ {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `~bool`, `~bool`},
+ {`package u3a; func _[_ interface{int | string | ~float64|~bool}]() {}`, `int | string | ~float64`, `int | string | ~float64`},
+
+ {`package u0b; func _[_ int]() {}`, `int`, `int`},
+ {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
+ {`package u2b; func _[_ int | string]() {}`, `int | string`, `int | string`},
+ {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string | ~bool`, `int | string | ~bool`},
+ {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string`, `int | string`},
+ {`package u3b; func _[_ int | string | ~bool]() {}`, `~bool`, `~bool`},
+ {`package u3b; func _[_ int | string | ~float64|~bool]() {}`, `int | string | ~float64`, `int | string | ~float64`},
+
+ {`package u0c; type _ interface{int}`, `int`, `int`},
+ {`package u1c; type _ interface{~int}`, `~int`, `~int`},
+ {`package u2c; type _ interface{int | string}`, `int | string`, `int | string`},
+ {`package u3c; type _ interface{int | string | ~bool}`, `int | string | ~bool`, `int | string | ~bool`},
+ {`package u3c; type _ interface{int | string | ~bool}`, `int | string`, `int | string`},
+ {`package u3c; type _ interface{int | string | ~bool}`, `~bool`, `~bool`},
+ {`package u3c; type _ interface{int | string | ~float64|~bool}`, `int | string | ~float64`, `int | string | ~float64`},
+
+ // reverse type inference
+ {`package r1; var _ func(int) = g; func g[P any](P) {}`, `g`, `func(int)`},
+ {`package r2; var _ func(int) = g[int]; func g[P any](P) {}`, `g`, `func[P any](P)`}, // go.dev/issues/60212
+ {`package r3; var _ func(int) = g[int]; func g[P any](P) {}`, `g[int]`, `func(int)`},
+ {`package r4; var _ func(int, string) = g; func g[P, Q any](P, Q) {}`, `g`, `func(int, string)`},
+ {`package r5; var _ func(int, string) = g[int]; func g[P, Q any](P, Q) {}`, `g`, `func[P, Q any](P, Q)`}, // go.dev/issues/60212
+ {`package r6; var _ func(int, string) = g[int]; func g[P, Q any](P, Q) {}`, `g[int]`, `func(int, string)`},
+
+ {`package s1; func _() { f(g) }; func f(func(int)) {}; func g[P any](P) {}`, `g`, `func(int)`},
+ {`package s2; func _() { f(g[int]) }; func f(func(int)) {}; func g[P any](P) {}`, `g`, `func[P any](P)`}, // go.dev/issues/60212
+ {`package s3; func _() { f(g[int]) }; func f(func(int)) {}; func g[P any](P) {}`, `g[int]`, `func(int)`},
+ {`package s4; func _() { f(g) }; func f(func(int, string)) {}; func g[P, Q any](P, Q) {}`, `g`, `func(int, string)`},
+ {`package s5; func _() { f(g[int]) }; func f(func(int, string)) {}; func g[P, Q any](P, Q) {}`, `g`, `func[P, Q any](P, Q)`}, // go.dev/issues/60212
+ {`package s6; func _() { f(g[int]) }; func f(func(int, string)) {}; func g[P, Q any](P, Q) {}`, `g[int]`, `func(int, string)`},
+
+ {`package s7; func _() { f(g, h) }; func f[P any](func(int, P), func(P, string)) {}; func g[P any](P, P) {}; func h[P, Q any](P, Q) {}`, `g`, `func(int, int)`},
+ {`package s8; func _() { f(g, h) }; func f[P any](func(int, P), func(P, string)) {}; func g[P any](P, P) {}; func h[P, Q any](P, Q) {}`, `h`, `func(int, string)`},
+ {`package s9; func _() { f(g, h[int]) }; func f[P any](func(int, P), func(P, string)) {}; func g[P any](P, P) {}; func h[P, Q any](P, Q) {}`, `h`, `func[P, Q any](P, Q)`}, // go.dev/issues/60212
+ {`package s10; func _() { f(g, h[int]) }; func f[P any](func(int, P), func(P, string)) {}; func g[P any](P, P) {}; func h[P, Q any](P, Q) {}`, `h[int]`, `func(int, string)`},
}
for _, test := range tests {
info := Info{Types: make(map[ast.Expr]TypeAndValue)}
var name string
if strings.HasPrefix(test.src, broken) {
- var err error
- name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
+ pkg, err := typecheck(test.src, nil, &info)
if err == nil {
- t.Errorf("package %s: expected to fail but passed", name)
+ t.Errorf("package %s: expected to fail but passed", pkg.Name())
continue
}
+ if pkg != nil {
+ name = pkg.Name()
+ }
} else {
- name = mustTypecheck(t, "TypesInfo", test.src, &info)
+ name = mustTypecheck(test.src, nil, &info).Name()
}
// look for expression type
// check that type is correct
if got := typ.String(); got != test.typ {
- t.Errorf("package %s: got %s; want %s", name, got, test.typ)
+ t.Errorf("package %s: expr = %s: got %s; want %s", name, test.expr, got, test.typ)
}
}
}
func TestInstanceInfo(t *testing.T) {
- var tests = []struct {
- src string
+ const lib = `package lib
+
+func F[P any](P) {}
+
+type T[P any] []P
+`
+
+ type testInst struct {
name string
targs []string
typ string
+ }
+
+ var tests = []struct {
+ src string
+ instances []testInst // recorded instances in source order
}{
{`package p0; func f[T any](T) {}; func _() { f(42) }`,
- `f`,
- []string{`int`},
- `func(int)`,
+ []testInst{{`f`, []string{`int`}, `func(int)`}},
},
{`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
- `f`,
- []string{`rune`},
- `func(rune) rune`,
+ []testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
},
{`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
- `f`,
- []string{`complex128`},
- `func(...complex128) complex128`,
+ []testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
},
{`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
- `f`,
- []string{`float64`, `string`, `byte`},
- `func(float64, *string, []byte)`,
+ []testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
},
{`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
- `f`,
- []string{`float64`, `byte`},
- `func(float64, *byte, ...[]byte)`,
+ []testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
},
- {`package s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
- `f`,
- []string{`string`, `*string`},
- `func(x string)`,
+ {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
+ []testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
},
- {`package s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
- `f`,
- []string{`int`, `*int`},
- `func(x []int)`,
+ {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
+ []testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
},
- {`package s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
- `f`,
- []string{`int`, `chan<- int`},
- `func(x []int)`,
+ {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
+ []testInst{
+ {`C`, []string{`T`}, `interface{chan<- T}`},
+ {`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
+ },
},
- {`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) }`,
- `f`,
- []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
- `func(x []int)`,
+ {`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) }`,
+ []testInst{
+ {`C`, []string{`T`}, `interface{chan<- T}`},
+ {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
+ {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
+ },
},
- {`package t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
- `f`,
- []string{`string`, `*string`},
- `func() string`,
+ {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
+ []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
},
- {`package t2; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
- `f`,
- []string{`string`, `*string`},
- `func() string`,
+ {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
+ []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
},
- {`package t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]]() []T { return nil }; func _() { _ = f[int] }`,
- `f`,
- []string{`int`, `chan<- int`},
- `func() []int`,
+ {`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] }`,
+ []testInst{
+ {`C`, []string{`T`}, `interface{chan<- T}`},
+ {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
+ {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
+ },
},
- {`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] }`,
- `f`,
- []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
- `func() []int`,
+ {`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]) }`,
+ []testInst{
+ {`C`, []string{`T`}, `interface{chan<- T}`},
+ {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
+ {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
+ },
},
{`package i0; import "lib"; func _() { lib.F(42) }`,
- `F`,
- []string{`int`},
- `func(int)`,
+ []testInst{{`F`, []string{`int`}, `func(int)`}},
+ },
+
+ {`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
+ []testInst{
+ {`f`, []string{`int`}, `func(int)`},
+ {`f`, []string{`string`}, `func(string)`},
+ {`f`, []string{`int`}, `func(int)`},
+ },
+ },
+ {`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
+ []testInst{
+ {`F`, []string{`int`}, `func(int)`},
+ {`F`, []string{`string`}, `func(string)`},
+ {`F`, []string{`int`}, `func(int)`},
+ },
},
+
{`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
- `T`,
- []string{`int`},
- `struct{x int}`,
+ []testInst{{`T`, []string{`int`}, `struct{x int}`}},
},
{`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
- `T`,
- []string{`int`},
- `struct{x int}`,
+ []testInst{{`T`, []string{`int`}, `struct{x int}`}},
},
{`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
- `T`,
- []string{`int`},
- `struct{x int}`,
+ []testInst{{`T`, []string{`int`}, `struct{x int}`}},
},
{`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
- `T`,
- []string{`[]int`, `int`},
- `struct{x []int; y int}`,
+ []testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
},
{`package type4; import "lib"; var _ lib.T[int]`,
- `T`,
- []string{`int`},
- `[]int`,
+ []testInst{{`T`, []string{`int`}, `[]int`}},
},
- }
- for _, test := range tests {
- const lib = `package lib
-
-func F[P any](P) {}
+ {`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
+ []testInst{
+ {`T`, []string{`int`}, `struct{x int}`},
+ {`T`, []string{`int`}, `struct{x int}`},
+ },
+ },
+ {`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
+ []testInst{
+ {`T`, []string{`Q`}, `struct{x Q}`},
+ {`T`, []string{`Q`}, `struct{x Q}`},
+ },
+ },
+ {`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
+ []testInst{
+ {`T`, []string{`int`}, `[]int`},
+ {`T`, []string{`int`}, `[]int`},
+ {`T`, []string{`string`}, `[]string`},
+ },
+ },
+ {`package issue51803; func foo[T any](T) {}; func _() { foo[int]( /* leave arg away on purpose */ ) }`,
+ []testInst{{`foo`, []string{`int`}, `func(int)`}},
+ },
-type T[P any] []P
-`
+ // reverse type inference
+ {`package reverse1a; var f func(int) = g; func g[P any](P) {}`,
+ []testInst{{`g`, []string{`int`}, `func(int)`}},
+ },
+ {`package reverse1b; func f(func(int)) {}; func g[P any](P) {}; func _() { f(g) }`,
+ []testInst{{`g`, []string{`int`}, `func(int)`}},
+ },
+ {`package reverse2a; var f func(int, string) = g; func g[P, Q any](P, Q) {}`,
+ []testInst{{`g`, []string{`int`, `string`}, `func(int, string)`}},
+ },
+ {`package reverse2b; func f(func(int, string)) {}; func g[P, Q any](P, Q) {}; func _() { f(g) }`,
+ []testInst{{`g`, []string{`int`, `string`}, `func(int, string)`}},
+ },
+ {`package reverse2c; func f(func(int, string)) {}; func g[P, Q any](P, Q) {}; func _() { f(g[int]) }`,
+ []testInst{{`g`, []string{`int`, `string`}, `func(int, string)`}},
+ },
+ // reverse3a not possible (cannot assign to generic function outside of argument passing)
+ {`package reverse3b; func f[R any](func(int) R) {}; func g[P any](P) string { return "" }; func _() { f(g) }`,
+ []testInst{
+ {`f`, []string{`string`}, `func(func(int) string)`},
+ {`g`, []string{`int`}, `func(int) string`},
+ },
+ },
+ {`package reverse4a; var _, _ func([]int, *float32) = g, h; func g[P, Q any]([]P, *Q) {}; func h[R any]([]R, *float32) {}`,
+ []testInst{
+ {`g`, []string{`int`, `float32`}, `func([]int, *float32)`},
+ {`h`, []string{`int`}, `func([]int, *float32)`},
+ },
+ },
+ {`package reverse4b; func f(_, _ func([]int, *float32)) {}; func g[P, Q any]([]P, *Q) {}; func h[R any]([]R, *float32) {}; func _() { f(g, h) }`,
+ []testInst{
+ {`g`, []string{`int`, `float32`}, `func([]int, *float32)`},
+ {`h`, []string{`int`}, `func([]int, *float32)`},
+ },
+ },
+ {`package issue59956; func f(func(int), func(string), func(bool)) {}; func g[P any](P) {}; func _() { f(g, g, g) }`,
+ []testInst{
+ {`g`, []string{`int`}, `func(int)`},
+ {`g`, []string{`string`}, `func(string)`},
+ {`g`, []string{`bool`}, `func(bool)`},
+ },
+ },
+ }
+ for _, test := range tests {
imports := make(testImporter)
conf := Config{Importer: imports}
- instances := make(map[*ast.Ident]Instance)
- uses := make(map[*ast.Ident]Object)
+ instMap := make(map[*ast.Ident]Instance)
+ useMap := make(map[*ast.Ident]Object)
makePkg := func(src string) *Package {
- f, err := parser.ParseFile(fset, "p.go", src, 0)
- if err != nil {
- t.Fatal(err)
- }
- pkg, err := conf.Check("", fset, []*ast.File{f}, &Info{Instances: instances, Uses: uses})
- if err != nil {
+ pkg, err := typecheck(src, &conf, &Info{Instances: instMap, Uses: useMap})
+ // allow error for issue51803
+ if err != nil && (pkg == nil || pkg.Name() != "issue51803") {
t.Fatal(err)
}
imports[pkg.Name()] = pkg
makePkg(lib)
pkg := makePkg(test.src)
- // look for instance information
- var targs []Type
- var typ Type
- for ident, inst := range instances {
- if ExprString(ident) == test.name {
- for i := 0; i < inst.TypeArgs.Len(); i++ {
- targs = append(targs, inst.TypeArgs.At(i))
+ t.Run(pkg.Name(), func(t *testing.T) {
+ // Sort instances in source order for stability.
+ instances := sortedInstances(instMap)
+ if got, want := len(instances), len(test.instances); got != want {
+ t.Fatalf("got %d instances, want %d", got, want)
+ }
+
+ // Pairwise compare with the expected instances.
+ for ii, inst := range instances {
+ var targs []Type
+ for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
+ targs = append(targs, inst.Inst.TypeArgs.At(i))
+ }
+ typ := inst.Inst.Type
+
+ testInst := test.instances[ii]
+ if got := inst.Ident.Name; got != testInst.name {
+ t.Fatalf("got name %s, want %s", got, testInst.name)
+ }
+ if len(targs) != len(testInst.targs) {
+ t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
+ }
+ for i, targ := range targs {
+ if got := targ.String(); got != testInst.targs[i] {
+ t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
+ }
+ }
+ if got := typ.Underlying().String(); got != testInst.typ {
+ t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
}
- typ = inst.Type
- // Check that we can find the corresponding parameterized type.
- ptype := uses[ident].Type()
+ // Verify the invariant that re-instantiating the corresponding generic
+ // type with TypeArgs results in an identical instance.
+ ptype := useMap[inst.Ident].Type()
lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
if lister == nil || lister.TypeParams().Len() == 0 {
- t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
- continue
+ t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Ident, ptype)
}
-
- // Verify the invariant that re-instantiating the generic type with
- // TypeArgs results in an equivalent type.
inst2, err := Instantiate(nil, ptype, targs, true)
if err != nil {
t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
}
- if !Identical(inst.Type, inst2) {
- t.Errorf("%v and %v are not identical", inst.Type, inst2)
+ if !Identical(inst.Inst.Type, inst2) {
+ t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
}
- break
}
- }
- if targs == nil {
- t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
- continue
- }
+ })
+ }
+}
- // check that type arguments are correct
- if len(targs) != len(test.targs) {
- t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
- continue
- }
- for i, targ := range targs {
- if got := targ.String(); got != test.targs[i] {
- t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
- continue
- }
- }
+type recordedInstance struct {
+ Ident *ast.Ident
+ Inst Instance
+}
- // check that the types match
- if got := typ.Underlying().String(); got != test.typ {
- t.Errorf("package %s: got %s; want %s", pkg.Name(), got, test.typ)
- }
+func sortedInstances(m map[*ast.Ident]Instance) (instances []recordedInstance) {
+ for id, inst := range m {
+ instances = append(instances, recordedInstance{id, inst})
}
+ sort.Slice(instances, func(i, j int) bool {
+ return CmpPos(instances[i].Ident.Pos(), instances[j].Ident.Pos()) < 0
+ })
+ return instances
}
func TestDefsInfo(t *testing.T) {
{`package p3; type x int`, `x`, `type p3.x int`},
{`package p4; func f()`, `f`, `func p4.f()`},
{`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
+
+ // Tests using generics.
+ {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
+ {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
+ {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
}
for _, test := range tests {
info := Info{
Defs: make(map[*ast.Ident]Object),
}
- name := mustTypecheck(t, "DefsInfo", test.src, &info)
+ name := mustTypecheck(test.src, nil, &info).Name()
// find object
var def Object
{`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
{`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
{`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
+
+ // Tests using generics.
+ {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
+ {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
+ {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
+ {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
+
+ // Uses of fields are instantiated.
+ {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
+ {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
+
+ // Uses of methods are uses of the instantiated method.
+ {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
+ {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
+ {`package m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
+ {`package m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
+ {`package m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
+ {`package m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m5.T[B]).m() B`},
+ {`package m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m6.T[B]).m()`},
+ {`package m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (m7.T[int]).m() int`},
+ {`package m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (m8.T[int]).m()`},
+ {`package m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (m9.T[int]).m()`},
+ {
+ `package m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
+ `m`,
+ `func (m10.E[int]).m()`,
+ },
+ {`package m11; type T[A any] interface{ m(); n() }; func _(t1 T[int], t2 T[string]) { t1.m(); t2.n() }`, `m`, `func (m11.T[int]).m()`},
+ {`package m12; type T[A any] interface{ m(); n() }; func _(t1 T[int], t2 T[string]) { t1.m(); t2.n() }`, `n`, `func (m12.T[string]).n()`},
}
for _, test := range tests {
info := Info{
Uses: make(map[*ast.Ident]Object),
}
- name := mustTypecheck(t, "UsesInfo", test.src, &info)
+ name := mustTypecheck(test.src, nil, &info).Name()
// find object
var use Object
for id, obj := range info.Uses {
if id.Name == test.obj {
+ if use != nil {
+ panic(fmt.Sprintf("multiple uses of %q", id.Name))
+ }
use = obj
- break
}
}
if use == nil {
}
}
+func TestGenericMethodInfo(t *testing.T) {
+ src := `package p
+
+type N[A any] int
+
+func (r N[B]) m() { r.m(); r.n() }
+
+func (r *N[C]) n() { }
+`
+ fset := token.NewFileSet()
+ f := mustParse(fset, src)
+ info := Info{
+ Defs: make(map[*ast.Ident]Object),
+ Uses: make(map[*ast.Ident]Object),
+ Selections: make(map[*ast.SelectorExpr]*Selection),
+ }
+ var conf Config
+ pkg, err := conf.Check("p", fset, []*ast.File{f}, &info)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ N := pkg.Scope().Lookup("N").Type().(*Named)
+
+ // Find the generic methods stored on N.
+ gm, gn := N.Method(0), N.Method(1)
+ if gm.Name() == "n" {
+ gm, gn = gn, gm
+ }
+
+ // Collect objects from info.
+ var dm, dn *Func // the declared methods
+ var dmm, dmn *Func // the methods used in the body of m
+ for _, decl := range f.Decls {
+ fdecl, ok := decl.(*ast.FuncDecl)
+ if !ok {
+ continue
+ }
+ def := info.Defs[fdecl.Name].(*Func)
+ switch fdecl.Name.Name {
+ case "m":
+ dm = def
+ ast.Inspect(fdecl.Body, func(n ast.Node) bool {
+ if call, ok := n.(*ast.CallExpr); ok {
+ sel := call.Fun.(*ast.SelectorExpr)
+ use := info.Uses[sel.Sel].(*Func)
+ selection := info.Selections[sel]
+ if selection.Kind() != MethodVal {
+ t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
+ }
+ if selection.Obj() != use {
+ t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
+ }
+ switch sel.Sel.Name {
+ case "m":
+ dmm = use
+ case "n":
+ dmn = use
+ }
+ }
+ return true
+ })
+ case "n":
+ dn = def
+ }
+ }
+
+ if gm != dm {
+ t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
+ }
+ if gn != dn {
+ t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
+ }
+ if dmm != dm {
+ t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
+ }
+ if dmn == dn {
+ t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
+ }
+}
+
func TestImplicitsInfo(t *testing.T) {
testenv.MustHaveGoBuild(t)
{`package p8; func f(int) {}`, "field: var int"},
{`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
{`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
+
+ // Tests using generics.
+ {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
+ {`package f1; func f[T any](int) {}`, "field: var int"},
+ {`package f2; func f[T any](T) {}`, "field: var T"},
+ {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
+ {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
+ {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
+ {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
+ {`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]"},
+ {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
}
for _, test := range tests {
info := Info{
Implicits: make(map[ast.Node]Object),
}
- name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
+ name := mustTypecheck(test.src, nil, &info).Name()
// the test cases expect at most one Implicits entry
if len(info.Implicits) > 1 {
}
}
+func TestPkgNameOf(t *testing.T) {
+ testenv.MustHaveGoBuild(t)
+
+ const src = `
+package p
+
+import (
+ . "os"
+ _ "io"
+ "math"
+ "path/filepath"
+ snort "sort"
+)
+
+// avoid imported and not used errors
+var (
+ _ = Open // os.Open
+ _ = math.Sin
+ _ = filepath.Abs
+ _ = snort.Ints
+)
+`
+
+ var tests = []struct {
+ path string // path string enclosed in "'s
+ want string
+ }{
+ {`"os"`, "."},
+ {`"io"`, "_"},
+ {`"math"`, "math"},
+ {`"path/filepath"`, "filepath"},
+ {`"sort"`, "snort"},
+ }
+
+ fset := token.NewFileSet()
+ f := mustParse(fset, src)
+ info := Info{
+ Defs: make(map[*ast.Ident]Object),
+ Implicits: make(map[ast.Node]Object),
+ }
+ var conf Config
+ conf.Importer = importer.Default()
+ _, err := conf.Check("p", fset, []*ast.File{f}, &info)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // map import paths to importDecl
+ imports := make(map[string]*ast.ImportSpec)
+ for _, s := range f.Decls[0].(*ast.GenDecl).Specs {
+ if imp, _ := s.(*ast.ImportSpec); imp != nil {
+ imports[imp.Path.Value] = imp
+ }
+ }
+
+ for _, test := range tests {
+ imp := imports[test.path]
+ if imp == nil {
+ t.Fatalf("invalid test case: import path %s not found", test.path)
+ }
+ got := info.PkgNameOf(imp)
+ if got == nil {
+ t.Fatalf("import %s: package name not found", test.path)
+ }
+ if got.Name() != test.want {
+ t.Errorf("import %s: got %s; want %s", test.path, got.Name(), test.want)
+ }
+ }
+
+ // test non-existing importDecl
+ if got := info.PkgNameOf(new(ast.ImportSpec)); got != nil {
+ t.Errorf("got %s for non-existing import declaration", got.Name())
+ }
+}
+
func predString(tv TypeAndValue) string {
- var buf bytes.Buffer
+ var buf strings.Builder
pred := func(b bool, s string) {
if b {
if buf.Len() > 0 {
// values
{`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
- {`package v1; var _ = &[]int{1}`, `([]int literal)`, `value`},
+ {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
{`package v2; var _ = func(){}`, `(func() literal)`, `value`},
{`package v4; func f() { _ = f }`, `f`, `value`},
{`package v3; var _ *int = nil`, `nil`, `value, nil`},
for _, test := range tests {
info := Info{Types: make(map[ast.Expr]TypeAndValue)}
- name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
+ name := mustTypecheck(test.src, nil, &info).Name()
// look for expression predicates
got := "<missing>"
for _, test := range tests {
info := Info{Scopes: make(map[ast.Node]*Scope)}
- name := mustTypecheck(t, "ScopesInfo", test.src, &info)
+ name := mustTypecheck(test.src, nil, &info).Name()
// number of scopes must match
if len(info.Scopes) != len(test.scopes) {
}`, []string{
"d = 3", "b = f()", "c = f()", "a = c + b",
}},
- // test case for issue 7131
+ // test case for go.dev/issue/7131
{`package main
var counter int
`, []string{
"a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
}},
- // test case for issue 10709
+ // test case for go.dev/issue/10709
{`package p13
var (
}`, []string{
"t = makeT(0)", "v = t.m()",
}},
- // test case for issue 10709: same as test before, but variable decls swapped
+ // test case for go.dev/issue/10709: same as test before, but variable decls swapped
{`package p14
var (
}`, []string{
"t = makeT(0)", "v = t.m()",
}},
- // another candidate possibly causing problems with issue 10709
+ // another candidate possibly causing problems with go.dev/issue/10709
{`package p15
var y1 = f1()
for _, test := range tests {
info := Info{}
- name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
+ name := mustTypecheck(test.src, nil, &info).Name()
// number of initializers must match
if len(info.InitOrder) != len(test.inits) {
func TestMultiFileInitOrder(t *testing.T) {
fset := token.NewFileSet()
- mustParse := func(src string) *ast.File {
- f, err := parser.ParseFile(fset, "main", src, 0)
- if err != nil {
- t.Fatal(err)
- }
- return f
- }
-
- fileA := mustParse(`package main; var a = 1`)
- fileB := mustParse(`package main; var b = 2`)
+ fileA := mustParse(fset, `package main; var a = 1`)
+ fileB := mustParse(fset, `package main; var b = 2`)
// The initialization order must not depend on the parse
// order of the files, only on the presentation order to
var info Info
check := NewChecker(&conf, fset, pkg, &info)
- for i, src := range sources {
- filename := fmt.Sprintf("sources%d", i)
- f, err := parser.ParseFile(fset, filename, src, 0)
- if err != nil {
- t.Fatal(err)
- }
- if err := check.Files([]*ast.File{f}); err != nil {
+ for _, src := range sources {
+ if err := check.Files([]*ast.File{mustParse(fset, src)}); err != nil {
t.Error(err)
}
}
func TestSelection(t *testing.T) {
selections := make(map[*ast.SelectorExpr]*Selection)
+ // We need a specific fileset in this test below for positions.
+ // Cannot use typecheck helper.
fset := token.NewFileSet()
imports := make(testImporter)
conf := Config{Importer: imports}
makePkg := func(path, src string) {
- f, err := parser.ParseFile(fset, path+".go", src, 0)
- if err != nil {
- t.Fatal(err)
- }
- pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
+ pkg, err := conf.Check(path, fset, []*ast.File{mustParse(fset, src)}, &Info{Selections: selections})
if err != nil {
t.Fatal(err)
}
c int
}
+type G[P any] struct {
+ p P
+}
+
+func (G[P]) m(P) {}
+
+var Inst G[int]
+
func (C) g()
func (*C) h()
func main() {
// qualified identifiers
var _ lib.T
- _ = lib.C
- _ = lib.F
- _ = lib.V
+ _ = lib.C
+ _ = lib.F
+ _ = lib.V
_ = lib.T.M
// fields
_ = A{}.c
_ = new(A).c
+ _ = Inst.p
+ _ = G[string]{}.p
+
// methods
- _ = A{}.f
- _ = new(A).f
- _ = A{}.g
- _ = new(A).g
- _ = new(A).h
+ _ = A{}.f
+ _ = new(A).f
+ _ = A{}.g
+ _ = new(A).g
+ _ = new(A).h
- _ = B{}.f
- _ = new(B).f
+ _ = B{}.f
+ _ = new(B).f
- _ = C{}.g
- _ = new(C).g
- _ = new(C).h
+ _ = C{}.g
+ _ = new(C).g
+ _ = new(C).h
+ _ = Inst.m
// method expressions
- _ = A.f
- _ = (*A).f
- _ = B.f
- _ = (*B).f
+ _ = A.f
+ _ = (*A).f
+ _ = B.f
+ _ = (*B).f
+ _ = G[string].m
}`
wantOut := map[string][2]string{
"new(A).b": {"field (*main.A) b int", "->[0 0]"},
"A{}.c": {"field (main.A) c int", ".[1 0]"},
"new(A).c": {"field (*main.A) c int", "->[1 0]"},
+ "Inst.p": {"field (main.G[int]) p int", ".[0]"},
"A{}.f": {"method (main.A) f(int)", "->[0 0]"},
"new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
"C{}.g": {"method (main.C) g()", ".[0]"},
"new(C).g": {"method (*main.C) g()", "->[0]"},
"new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
+ "Inst.m": {"method (main.G[int]) m(int)", ".[0]"},
- "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
- "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
- "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
- "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
+ "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
+ "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
+ "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
+ "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
+ "G[string].m": {"method expr (main.G[string]) m(main.G[string], string)", ".[0]"},
+ "G[string]{}.p": {"field (main.G[string]) p string", ".[0]"},
}
makePkg("lib", libSrc)
Importer: imports,
}
makePkg := func(path, src string) {
- f, err := parser.ParseFile(fset, path, src, 0)
- if err != nil {
- t.Fatal(err)
- }
- pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
- imports[path] = pkg
+ imports[path], _ = conf.Check(path, fset, []*ast.File{mustParse(fset, src)}, nil) // errors logged via conf.Error
}
const libSrc = `
makePkg("main", mainSrc) // don't crash when type-checking this package
}
+func TestIssue59603(t *testing.T) {
+ fset := token.NewFileSet()
+ imports := make(testImporter)
+ conf := Config{
+ Error: func(err error) { t.Log(err) }, // don't exit after first error
+ Importer: imports,
+ }
+ makePkg := func(path, src string) {
+ imports[path], _ = conf.Check(path, fset, []*ast.File{mustParse(fset, src)}, nil) // errors logged via conf.Error
+ }
+
+ const libSrc = `
+package a
+const C = foo
+`
+
+ const mainSrc = `
+package main
+import "a"
+const _ = a.C
+`
+
+ makePkg("a", libSrc)
+ makePkg("main", mainSrc) // don't crash when type-checking this package
+}
+
+func TestLookupFieldOrMethodOnNil(t *testing.T) {
+ // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
+ defer func() {
+ const want = "LookupFieldOrMethod on nil type"
+ p := recover()
+ if s, ok := p.(string); !ok || s != want {
+ t.Fatalf("got %v, want %s", p, want)
+ }
+ }()
+ LookupFieldOrMethod(nil, false, nil, "")
+}
+
func TestLookupFieldOrMethod(t *testing.T) {
// Test cases assume a lookup of the form a.f or x.f, where a stands for an
// addressable value, and x for a non-addressable value (even though a variable
{"var x T; type T struct{ f int }", true, []int{0}, false},
{"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
+ // field lookups on a generic type
+ {"var x T[int]; type T[P any] struct{}", false, nil, false},
+ {"var x T[int]; type T[P any] struct{ f P }", true, []int{0}, false},
+ {"var x T[int]; type T[P any] struct{ a, b, f, c P }", true, []int{2}, false},
+
// method lookups
{"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
{"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
{"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
{"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
+ // method lookups on a generic type
+ {"var a T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, false},
+ {"var a *T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, true},
+ {"var a T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, false},
+ {"var a *T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
+
// collisions
{"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
{"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
+ // collisions on a generic type
+ {"type ( E1[P any] struct{ f P }; E2[P any] struct{ f P }; x struct{ E1[int]; *E2[int] })", false, []int{1, 0}, false},
+ {"type ( E1[P any] struct{ f P }; E2[P any] struct{}; x struct{ E1[int]; *E2[int] }); func (E2[P]) f() {}", false, []int{1, 0}, false},
+
// outside methodset
// (*T).f method exists, but value of type T is not addressable
{"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
+
+ // outside method set of a generic type
+ {"var x T[int]; type T[P any] struct{}; func (*T[P]) f() {}", false, nil, true},
+
+ // recursive generic types; see go.dev/issue/52715
+ {"var a T[int]; type ( T[P any] struct { *N[P] }; N[P any] struct { *T[P] } ); func (N[P]) f() {}", true, []int{0, 0}, true},
+ {"var a T[int]; type ( T[P any] struct { *N[P] }; N[P any] struct { *T[P] } ); func (T[P]) f() {}", true, []int{0}, false},
}
for _, test := range tests {
- pkg, err := pkgFor("test", "package p;"+test.src, nil)
- if err != nil {
- t.Errorf("%s: incorrect test case: %s", test.src, err)
- continue
- }
+ pkg := mustTypecheck("package p;"+test.src, nil, nil)
obj := pkg.Scope().Lookup("a")
if obj == nil {
}
}
+// Test for go.dev/issue/52715
+func TestLookupFieldOrMethod_RecursiveGeneric(t *testing.T) {
+ const src = `
+package pkg
+
+type Tree[T any] struct {
+ *Node[T]
+}
+
+func (*Tree[R]) N(r R) R { return r }
+
+type Node[T any] struct {
+ *Tree[T]
+}
+
+type Instance = *Tree[int]
+`
+
+ fset := token.NewFileSet()
+ f := mustParse(fset, src)
+ pkg := NewPackage("pkg", f.Name.Name)
+ if err := NewChecker(nil, fset, pkg, nil).Files([]*ast.File{f}); err != nil {
+ panic(err)
+ }
+
+ T := pkg.Scope().Lookup("Instance").Type()
+ _, _, _ = LookupFieldOrMethod(T, false, pkg, "M") // verify that LookupFieldOrMethod terminates
+}
+
func sameSlice(a, b []int) bool {
if len(a) != len(b) {
return false
fset := token.NewFileSet()
imports := make(testImporter)
conf := Config{Importer: imports}
- mustParse := func(src string) *ast.File {
- f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments)
- if err != nil {
- t.Fatal(err)
- }
- return f
- }
var info Info
makePkg := func(path string, files ...*ast.File) {
var err error
}
}
- makePkg("lib", mustParse("package lib; var X int"))
+ makePkg("lib", mustParse(fset, "package lib; var X int"))
// Each /*name=kind:line*/ comment makes the test look up the
// name at that point and checks that it resolves to a decl of
// the specified kind and line number. "undef" means undefined.
var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
var a []int
- for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
+ for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
var i interface{}
switch y := i.(type) { /*y=undef*/
`
info.Uses = make(map[*ast.Ident]Object)
- f := mustParse(mainSrc)
+ f := mustParse(fset, mainSrc)
makePkg("main", f)
mainScope := imports["main"].Scope()
rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
// newDefined creates a new defined type named T with the given underlying type.
// Helper function for use with TestIncompleteInterfaces only.
func newDefined(underlying Type) *Named {
- tname := NewTypeName(token.NoPos, nil, "T", nil)
+ tname := NewTypeName(nopos, nil, "T", nil)
return NewNamed(tname, underlying, nil)
}
{newDefined(new(Struct)), new(Struct), true},
{newDefined(Typ[Int]), new(Struct), false},
{Typ[UntypedInt], Typ[Int], true},
+ {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), true},
+ {NewSlice(Typ[Int]), NewArray(Typ[Uint], 10), false},
{NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
- {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
{NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
// Untyped string values are not permitted by the spec, so the behavior below is undefined.
{Typ[UntypedString], Typ[String], true},
}
}
+func TestIdentical(t *testing.T) {
+ // For each test, we compare the types of objects X and Y in the source.
+ tests := []struct {
+ src string
+ want bool
+ }{
+ // Basic types.
+ {"var X int; var Y int", true},
+ {"var X int; var Y string", false},
+
+ // TODO: add more tests for complex types.
+
+ // Named types.
+ {"type X int; type Y int", false},
+
+ // Aliases.
+ {"type X = int; type Y = int", true},
+
+ // Functions.
+ {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
+ {`func X() string { return "" }; func Y(int) string { return "" }`, false},
+ {`func X(int) string { return "" }; func Y(int) {}`, false},
+
+ // Generic functions. Type parameters should be considered identical modulo
+ // renaming. See also go.dev/issue/49722.
+ {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
+ {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
+ {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
+ {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
+ {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
+ {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
+ }
+
+ for _, test := range tests {
+ pkg := mustTypecheck("package p;"+test.src, nil, nil)
+ X := pkg.Scope().Lookup("X")
+ Y := pkg.Scope().Lookup("Y")
+ if X == nil || Y == nil {
+ t.Fatal("test must declare both X and Y")
+ }
+ if got := Identical(X.Type(), Y.Type()); got != test.want {
+ t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
+ }
+ }
+}
+
func TestIdentical_issue15173(t *testing.T) {
// Identical should allow nil arguments and be symmetric.
for _, test := range []struct {
}
func TestIdenticalUnions(t *testing.T) {
- tname := NewTypeName(token.NoPos, nil, "myInt", nil)
+ tname := NewTypeName(nopos, nil, "myInt", nil)
myInt := NewNamed(tname, Typ[Int], nil)
tmap := map[string]*Term{
"int": NewTerm(false, Typ[Int]),
}
}
+func TestIssue61737(t *testing.T) {
+ // This test verifies that it is possible to construct invalid interfaces
+ // containing duplicate methods using the go/types API.
+ //
+ // It must be possible for importers to construct such invalid interfaces.
+ // Previously, this panicked.
+
+ sig1 := NewSignatureType(nil, nil, nil, NewTuple(NewParam(nopos, nil, "", Typ[Int])), nil, false)
+ sig2 := NewSignatureType(nil, nil, nil, NewTuple(NewParam(nopos, nil, "", Typ[String])), nil, false)
+
+ methods := []*Func{
+ NewFunc(nopos, nil, "M", sig1),
+ NewFunc(nopos, nil, "M", sig2),
+ }
+
+ embeddedMethods := []*Func{
+ NewFunc(nopos, nil, "M", sig2),
+ }
+ embedded := NewInterfaceType(embeddedMethods, nil)
+ iface := NewInterfaceType(methods, []Type{embedded})
+ iface.Complete()
+}
+
func TestIssue15305(t *testing.T) {
const src = "package p; func f() int16; var _ = f(undef)"
fset := token.NewFileSet()
- f, err := parser.ParseFile(fset, "issue15305.go", src, 0)
- if err != nil {
- t.Fatal(err)
- }
+ f := mustParse(fset, src)
conf := Config{
Error: func(err error) {}, // allow errors
}
// types for composite literal expressions and composite literal type
// expressions.
func TestCompositeLitTypes(t *testing.T) {
- for _, test := range []struct {
+ for i, test := range []struct {
lit, typ string
}{
{`[16]byte{}`, `[16]byte`},
- {`[...]byte{}`, `[0]byte`}, // test for issue #14092
- {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
- {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
+ {`[...]byte{}`, `[0]byte`}, // test for go.dev/issue/14092
+ {`[...]int{1, 2, 3}`, `[3]int`}, // test for go.dev/issue/14092
+ {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for go.dev/issue/14092
{`[]int{}`, `[]int`},
{`map[string]bool{"foo": true}`, `map[string]bool`},
{`struct{}{}`, `struct{}`},
{`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
} {
fset := token.NewFileSet()
- f, err := parser.ParseFile(fset, test.lit, "package p; var _ = "+test.lit, 0)
- if err != nil {
- t.Fatalf("%s: %v", test.lit, err)
- }
-
- info := &Info{
- Types: make(map[ast.Expr]TypeAndValue),
- }
- if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
+ f := mustParse(fset, fmt.Sprintf("package p%d; var _ = %s", i, test.lit))
+ types := make(map[ast.Expr]TypeAndValue)
+ if _, err := new(Config).Check("p", fset, []*ast.File{f}, &Info{Types: types}); err != nil {
t.Fatalf("%s: %v", test.lit, err)
}
cmptype := func(x ast.Expr, want string) {
- tv, ok := info.Types[x]
+ tv, ok := types[x]
if !ok {
t.Errorf("%s: no Types entry found", test.lit)
return
`
fset := token.NewFileSet()
- f, err := parser.ParseFile(fset, "src", src, 0)
- if err != nil {
- t.Fatal(err)
- }
+ f := mustParse(fset, src)
info := &Info{
Defs: make(map[*ast.Ident]Object),
}
- if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
+ if _, err := new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
t.Fatal(err)
}
func f(x T) T { return foo.F(x) }
`
fset := token.NewFileSet()
- f, err := parser.ParseFile(fset, "src", src, 0)
- if err != nil {
- t.Fatal(err)
- }
+ f := mustParse(fset, src)
files := []*ast.File{f}
// type-check using all possible importers
func TestInstantiate(t *testing.T) {
// eventually we like more tests but this is a start
- const src = genericPkg + "p; type T[P any] *T[P]"
- pkg, err := pkgFor(".", src, nil)
- if err != nil {
- t.Fatal(err)
- }
+ const src = "package p; type T[P any] *T[P]"
+ pkg := mustTypecheck(src, nil, nil)
// type T should have one type parameter
T := pkg.Scope().Lookup("T").Type().(*Named)
}
}
+func TestInstantiateConcurrent(t *testing.T) {
+ const src = `package p
+
+type I[P any] interface {
+ m(P)
+ n() P
+}
+
+type J = I[int]
+
+type Nested[P any] *interface{b(P)}
+
+type K = Nested[string]
+`
+ pkg := mustTypecheck(src, nil, nil)
+
+ insts := []*Interface{
+ pkg.Scope().Lookup("J").Type().Underlying().(*Interface),
+ pkg.Scope().Lookup("K").Type().Underlying().(*Pointer).Elem().(*Interface),
+ }
+
+ // Use the interface instances concurrently.
+ for _, inst := range insts {
+ var (
+ counts [2]int // method counts
+ methods [2][]string // method strings
+ )
+ var wg sync.WaitGroup
+ for i := 0; i < 2; i++ {
+ i := i
+ wg.Add(1)
+ go func() {
+ defer wg.Done()
+
+ counts[i] = inst.NumMethods()
+ for mi := 0; mi < counts[i]; mi++ {
+ methods[i] = append(methods[i], inst.Method(mi).String())
+ }
+ }()
+ }
+ wg.Wait()
+
+ if counts[0] != counts[1] {
+ t.Errorf("mismatching method counts for %s: %d vs %d", inst, counts[0], counts[1])
+ continue
+ }
+ for i := 0; i < counts[0]; i++ {
+ if m0, m1 := methods[0][i], methods[1][i]; m0 != m1 {
+ t.Errorf("mismatching methods for %s: %s vs %s", inst, m0, m1)
+ }
+ }
+ }
+}
+
func TestInstantiateErrors(t *testing.T) {
tests := []struct {
src string // by convention, T must be the type being instantiated
}
for _, test := range tests {
- src := genericPkg + "p; " + test.src
- pkg, err := pkgFor(".", src, nil)
- if err != nil {
- t.Fatal(err)
- }
+ src := "package p; " + test.src
+ pkg := mustTypecheck(src, nil, nil)
T := pkg.Scope().Lookup("T").Type().(*Named)
- _, err = Instantiate(nil, T, test.targs, true)
+ _, err := Instantiate(nil, T, test.targs, true)
if err == nil {
t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
}
}
if argErr.Index != test.wantAt {
- t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
+ t.Errorf("Instantiate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
}
}
}
conf := Config{Importer: imports}
makePkg := func(src string) {
fset := token.NewFileSet()
- f, err := parser.ParseFile(fset, "", src, 0)
- if err != nil {
- t.Fatal(err)
- }
+ f := mustParse(fset, src)
name := f.Name.Name
pkg, err := conf.Check(name, fset, []*ast.File{f}, nil)
if err != nil {
}
imports[name] = pkg
}
- makePkg(genericPkg + `lib; type T[P any] struct{}`)
- makePkg(genericPkg + `a; import "generic_lib"; var A generic_lib.T[int]`)
- makePkg(genericPkg + `b; import "generic_lib"; var B generic_lib.T[int]`)
- a := imports["generic_a"].Scope().Lookup("A")
- b := imports["generic_b"].Scope().Lookup("B")
+ makePkg(`package lib; type T[P any] struct{}`)
+ makePkg(`package a; import "lib"; var A lib.T[int]`)
+ makePkg(`package b; import "lib"; var B lib.T[int]`)
+ a := imports["a"].Scope().Lookup("A")
+ b := imports["b"].Scope().Lookup("B")
if !Identical(a.Type(), b.Type()) {
t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
}
}
+
+// TestInstantiatedObjects verifies properties of instantiated objects.
+func TestInstantiatedObjects(t *testing.T) {
+ const src = `
+package p
+
+type T[P any] struct {
+ field P
+}
+
+func (recv *T[Q]) concreteMethod(mParam Q) (mResult Q) { return }
+
+type FT[P any] func(ftParam P) (ftResult P)
+
+func F[P any](fParam P) (fResult P){ return }
+
+type I[P any] interface {
+ interfaceMethod(P)
+}
+
+type R[P any] T[P]
+
+func (R[P]) m() {} // having a method triggers expansion of R
+
+var (
+ t T[int]
+ ft FT[int]
+ f = F[int]
+ i I[int]
+)
+
+func fn() {
+ var r R[int]
+ _ = r
+}
+`
+ info := &Info{
+ Defs: make(map[*ast.Ident]Object),
+ }
+ fset := token.NewFileSet()
+ f := mustParse(fset, src)
+ conf := Config{}
+ pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ lookup := func(name string) Type { return pkg.Scope().Lookup(name).Type() }
+ fnScope := pkg.Scope().Lookup("fn").(*Func).Scope()
+
+ tests := []struct {
+ name string
+ obj Object
+ }{
+ // Struct fields
+ {"field", lookup("t").Underlying().(*Struct).Field(0)},
+ {"field", fnScope.Lookup("r").Type().Underlying().(*Struct).Field(0)},
+
+ // Methods and method fields
+ {"concreteMethod", lookup("t").(*Named).Method(0)},
+ {"recv", lookup("t").(*Named).Method(0).Type().(*Signature).Recv()},
+ {"mParam", lookup("t").(*Named).Method(0).Type().(*Signature).Params().At(0)},
+ {"mResult", lookup("t").(*Named).Method(0).Type().(*Signature).Results().At(0)},
+
+ // Interface methods
+ {"interfaceMethod", lookup("i").Underlying().(*Interface).Method(0)},
+
+ // Function type fields
+ {"ftParam", lookup("ft").Underlying().(*Signature).Params().At(0)},
+ {"ftResult", lookup("ft").Underlying().(*Signature).Results().At(0)},
+
+ // Function fields
+ {"fParam", lookup("f").(*Signature).Params().At(0)},
+ {"fResult", lookup("f").(*Signature).Results().At(0)},
+ }
+
+ // Collect all identifiers by name.
+ idents := make(map[string][]*ast.Ident)
+ ast.Inspect(f, func(n ast.Node) bool {
+ if id, ok := n.(*ast.Ident); ok {
+ idents[id.Name] = append(idents[id.Name], id)
+ }
+ return true
+ })
+
+ for _, test := range tests {
+ test := test
+ t.Run(test.name, func(t *testing.T) {
+ if got := len(idents[test.name]); got != 1 {
+ t.Fatalf("found %d identifiers named %s, want 1", got, test.name)
+ }
+ ident := idents[test.name][0]
+ def := info.Defs[ident]
+ if def == test.obj {
+ t.Fatalf("info.Defs[%s] contains the test object", test.name)
+ }
+ if orig := originObject(test.obj); def != orig {
+ t.Errorf("info.Defs[%s] does not match obj.Origin()", test.name)
+ }
+ if def.Pkg() != test.obj.Pkg() {
+ t.Errorf("Pkg() = %v, want %v", def.Pkg(), test.obj.Pkg())
+ }
+ if def.Name() != test.obj.Name() {
+ t.Errorf("Name() = %v, want %v", def.Name(), test.obj.Name())
+ }
+ if def.Pos() != test.obj.Pos() {
+ t.Errorf("Pos() = %v, want %v", def.Pos(), test.obj.Pos())
+ }
+ if def.Parent() != test.obj.Parent() {
+ t.Fatalf("Parent() = %v, want %v", def.Parent(), test.obj.Parent())
+ }
+ if def.Exported() != test.obj.Exported() {
+ t.Fatalf("Exported() = %v, want %v", def.Exported(), test.obj.Exported())
+ }
+ if def.Id() != test.obj.Id() {
+ t.Fatalf("Id() = %v, want %v", def.Id(), test.obj.Id())
+ }
+ // String and Type are expected to differ.
+ })
+ }
+}
+
+func originObject(obj Object) Object {
+ switch obj := obj.(type) {
+ case *Var:
+ return obj.Origin()
+ case *Func:
+ return obj.Origin()
+ }
+ return obj
+}
+
+func TestImplements(t *testing.T) {
+ const src = `
+package p
+
+type EmptyIface interface{}
+
+type I interface {
+ m()
+}
+
+type C interface {
+ m()
+ ~int
+}
+
+type Integer interface{
+ int8 | int16 | int32 | int64
+}
+
+type EmptyTypeSet interface{
+ Integer
+ ~string
+}
+
+type N1 int
+func (N1) m() {}
+
+type N2 int
+func (*N2) m() {}
+
+type N3 int
+func (N3) m(int) {}
+
+type N4 string
+func (N4) m()
+
+type Bad Bad // invalid type
+`
+
+ fset := token.NewFileSet()
+ f := mustParse(fset, src)
+ conf := Config{Error: func(error) {}}
+ pkg, _ := conf.Check(f.Name.Name, fset, []*ast.File{f}, nil)
+
+ lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
+ var (
+ EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
+ I = lookup("I").(*Named)
+ II = I.Underlying().(*Interface)
+ C = lookup("C").(*Named)
+ CI = C.Underlying().(*Interface)
+ Integer = lookup("Integer").Underlying().(*Interface)
+ EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
+ N1 = lookup("N1")
+ N1p = NewPointer(N1)
+ N2 = lookup("N2")
+ N2p = NewPointer(N2)
+ N3 = lookup("N3")
+ N4 = lookup("N4")
+ Bad = lookup("Bad")
+ )
+
+ tests := []struct {
+ V Type
+ T *Interface
+ want bool
+ }{
+ {I, II, true},
+ {I, CI, false},
+ {C, II, true},
+ {C, CI, true},
+ {Typ[Int8], Integer, true},
+ {Typ[Int64], Integer, true},
+ {Typ[String], Integer, false},
+ {EmptyTypeSet, II, true},
+ {EmptyTypeSet, EmptyTypeSet, true},
+ {Typ[Int], EmptyTypeSet, false},
+ {N1, II, true},
+ {N1, CI, true},
+ {N1p, II, true},
+ {N1p, CI, false},
+ {N2, II, false},
+ {N2, CI, false},
+ {N2p, II, true},
+ {N2p, CI, false},
+ {N3, II, false},
+ {N3, CI, false},
+ {N4, II, true},
+ {N4, CI, false},
+ {Bad, II, false},
+ {Bad, CI, false},
+ {Bad, EmptyIface, true},
+ }
+
+ for _, test := range tests {
+ if got := Implements(test.V, test.T); got != test.want {
+ t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
+ }
+
+ // The type assertion x.(T) is valid if T is an interface or if T implements the type of x.
+ // The assertion is never valid if T is a bad type.
+ V := test.T
+ T := test.V
+ want := false
+ if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
+ want = true
+ }
+ if got := AssertableTo(V, T); got != want {
+ t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
+ }
+ }
+}
+
+func TestMissingMethodAlternative(t *testing.T) {
+ const src = `
+package p
+type T interface {
+ m()
+}
+
+type V0 struct{}
+func (V0) m() {}
+
+type V1 struct{}
+
+type V2 struct{}
+func (V2) m() int
+
+type V3 struct{}
+func (*V3) m()
+
+type V4 struct{}
+func (V4) M()
+`
+
+ pkg := mustTypecheck(src, nil, nil)
+
+ T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
+ lookup := func(name string) (*Func, bool) {
+ return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
+ }
+
+ // V0 has method m with correct signature. Should not report wrongType.
+ method, wrongType := lookup("V0")
+ if method != nil || wrongType {
+ t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
+ }
+
+ checkMissingMethod := func(tname string, reportWrongType bool) {
+ method, wrongType := lookup(tname)
+ if method == nil || method.Name() != "m" || wrongType != reportWrongType {
+ t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
+ }
+ }
+
+ // V1 has no method m. Should not report wrongType.
+ checkMissingMethod("V1", false)
+
+ // V2 has method m with wrong signature type (ignoring receiver). Should report wrongType.
+ checkMissingMethod("V2", true)
+
+ // V3 has no method m but it exists on *V3. Should report wrongType.
+ checkMissingMethod("V3", true)
+
+ // V4 has no method m but has M. Should not report wrongType.
+ checkMissingMethod("V4", false)
+}
+
+func TestErrorURL(t *testing.T) {
+ var conf Config
+ *stringFieldAddr(&conf, "_ErrorURL") = " [go.dev/e/%s]"
+
+ // test case for a one-line error
+ const src1 = `
+package p
+var _ T
+`
+ _, err := typecheck(src1, &conf, nil)
+ if err == nil || !strings.HasSuffix(err.Error(), " [go.dev/e/UndeclaredName]") {
+ t.Errorf("src1: unexpected error: got %v", err)
+ }
+
+ // test case for a multi-line error
+ const src2 = `
+package p
+func f() int { return 0 }
+var _ = f(1, 2)
+`
+ _, err = typecheck(src2, &conf, nil)
+ if err == nil || !strings.Contains(err.Error(), " [go.dev/e/WrongArgCount]\n") {
+ t.Errorf("src1: unexpected error: got %v", err)
+ }
+}
+
+func TestModuleVersion(t *testing.T) {
+ // version go1.dd must be able to typecheck go1.dd.0, go1.dd.1, etc.
+ goversion := fmt.Sprintf("go1.%d", goversion.Version)
+ for _, v := range []string{
+ goversion,
+ goversion + ".0",
+ goversion + ".1",
+ goversion + ".rc",
+ } {
+ conf := Config{GoVersion: v}
+ pkg := mustTypecheck("package p", &conf, nil)
+ if pkg.GoVersion() != conf.GoVersion {
+ t.Errorf("got %s; want %s", pkg.GoVersion(), conf.GoVersion)
+ }
+ }
+}
+
+func TestFileVersions(t *testing.T) {
+ for _, test := range []struct {
+ goVersion string
+ fileVersion string
+ wantVersion string
+ }{
+ {"", "", ""}, // no versions specified
+ {"go1.19", "", "go1.19"}, // module version specified
+ {"", "go1.20", ""}, // file upgrade ignored
+ {"go1.19", "go1.20", "go1.20"}, // file upgrade permitted
+ {"go1.20", "go1.19", "go1.20"}, // file downgrade not permitted
+ {"go1.21", "go1.19", "go1.19"}, // file downgrade permitted (module version is >= go1.21)
+
+ // versions containing release numbers
+ // (file versions containing release numbers are considered invalid)
+ {"go1.19.0", "", "go1.19.0"}, // no file version specified
+ {"go1.20", "go1.20.1", "go1.20"}, // file upgrade ignored
+ {"go1.20.1", "go1.20", "go1.20.1"}, // file upgrade ignored
+ {"go1.20.1", "go1.21", "go1.21"}, // file upgrade permitted
+ {"go1.20.1", "go1.19", "go1.20.1"}, // file downgrade not permitted
+ {"go1.21.1", "go1.19.1", "go1.21.1"}, // file downgrade not permitted (invalid file version)
+ {"go1.21.1", "go1.19", "go1.19"}, // file downgrade permitted (module version is >= go1.21)
+ } {
+ var src string
+ if test.fileVersion != "" {
+ src = "//go:build " + test.fileVersion + "\n"
+ }
+ src += "package p"
+
+ conf := Config{GoVersion: test.goVersion}
+ versions := make(map[*ast.File]string)
+ var info Info
+ info.FileVersions = versions
+ mustTypecheck(src, &conf, &info)
+
+ n := 0
+ for _, v := range versions {
+ want := test.wantVersion
+ if v != want {
+ t.Errorf("%q: unexpected file version: got %q, want %q", src, v, want)
+ }
+ n++
+ }
+ if n != 1 {
+ t.Errorf("%q: incorrect number of map entries: got %d", src, n)
+ }
+ }
+}