go issue49276 源码
golang issue49276 代码
文件路径：/src/cmd/compile/internal/types2/testdata/fixedbugs/issue49276.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
import "unsafe"
type S /* ERROR illegal cycle in declaration of S */ struct {
_ [unsafe.Sizeof(s)]byte
}
var s S
// Since f is a pointer, this case could be valid.
// But it's pathological and not worth the expense.
type T struct {
f *[unsafe.Sizeof(T /* ERROR illegal cycle in type declaration */ {})]int
}
// a mutually recursive case using unsafe.Sizeof
type (
A1 struct {
_ [unsafe.Sizeof(B1{})]int
}
B1 struct {
_ [unsafe.Sizeof(A1 /* ERROR illegal cycle in type declaration */ {})]int
}
)
// a mutually recursive case using len
type (
A2 struct {
f [len(B2{}.f)]int
}
B2 struct {
f [len(A2 /* ERROR illegal cycle in type declaration */ {}.f)]int
}
)
// test case from issue
type a struct {
_ [42 - unsafe.Sizeof(a /* ERROR illegal cycle in type declaration */ {})]byte
}
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