go issue49179 源码
golang issue49179 代码
文件路径：/src/cmd/compile/internal/types2/testdata/fixedbugs/issue49179.go
// Copyright 2021 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 f1[P int | string]() {}
func f2[P ~int | string | float64]() {}
func f3[P int](x P) {}
type myInt int
type myFloat float64
func _() {
_ = f1[int]
_ = f1[myInt /* ERROR possibly missing ~ for int in constraint int\|string */]
_ = f2[myInt]
_ = f2[myFloat /* ERROR possibly missing ~ for float64 in constraint int\|string|float64 */]
var x myInt
f3( /* ERROR myInt does not implement int \(possibly missing ~ for int in constraint int\) */ x)
}
// test case from the issue
type SliceConstraint[T any] interface {
[]T
}
func Map[S SliceConstraint[E], E any](s S, f func(E) E) S {
return s
}
type MySlice []int
func f(s MySlice) {
Map[MySlice /* ERROR MySlice does not implement SliceConstraint\[int\] \(possibly missing ~ for \[\]int in constraint SliceConstraint\[int\]\) */, int](s, nil)
}
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