go issue51257 源码
golang issue51257 代码
文件路径：/src/cmd/compile/internal/types2/testdata/fixedbugs/issue51257.go
// 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 p
func f[_ comparable]() {}
type S1 struct{ x int }
type S2 struct{ x any }
type S3 struct{ x [10]interface{ m() } }
func _[P1 comparable, P2 S2]() {
_ = f[S1]
_ = f[S2 /* ERROR S2 does not implement comparable */ ]
_ = f[S3 /* ERROR S3 does not implement comparable */ ]
type L1 struct { x P1 }
type L2 struct { x P2 }
_ = f[L1]
_ = f[L2 /* ERROR L2 does not implement comparable */ ]
}
// example from issue
type Set[T comparable] map[T]struct{}
func NewSetFromSlice[T comparable](items []T) *Set[T] {
s := Set[T]{}
for _, item := range items {
s[item] = struct{}{}
}
return &s
}
type T struct{ x any }
func main() {
NewSetFromSlice( /* ERROR T does not implement comparable */ []T{
{"foo"},
{5},
})
}
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