1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ssa
import (
"go/ast"
"go/parser"
"go/token"
"go/types"
"testing"
"golang.org/x/tools/internal/typeparams"
)
func TestIsParameterized(t *testing.T) {
if !typeparams.Enabled {
return
}
const source = `
package P
type A int
func (A) f()
func (*A) g()
type fer interface { f() }
func Apply[T fer](x T) T {
x.f()
return x
}
type V[T any] []T
func (v *V[T]) Push(x T) { *v = append(*v, x) }
`
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "hello.go", source, 0)
if err != nil {
t.Fatal(err)
}
var conf types.Config
pkg, err := conf.Check("P", fset, []*ast.File{f}, nil)
if err != nil {
t.Fatal(err)
}
for _, test := range []struct {
expr string // type expression
want bool // expected isParameterized value
}{
{"A", false},
{"*A", false},
{"error", false},
{"*error", false},
{"struct{A}", false},
{"*struct{A}", false},
{"fer", false},
{"Apply", true},
{"Apply[A]", false},
{"V", true},
{"V[A]", false},
{"*V[A]", false},
{"(*V[A]).Push", false},
} {
tv, err := types.Eval(fset, pkg, 0, test.expr)
if err != nil {
t.Errorf("Eval(%s) failed: %v", test.expr, err)
}
param := tpWalker{seen: make(map[types.Type]bool)}
if got := param.isParameterized(tv.Type); got != test.want {
t.Logf("Eval(%s) returned the type %s", test.expr, tv.Type)
t.Errorf("isParameterized(%s) = %v, want %v", test.expr, got, test.want)
}
}
}
|
