go/test/typeparam/issue39755.go
Matthew Dempsky 5355753009 [dev.typeparams] test/typeparam: gofmt -w
We don't usually reformat the test directory, but all of the files in
test/typeparam are syntactically valid. I suspect the misformattings
here are because developers aren't re-installing gofmt with
-tags=typeparams, not intentionally exercising non-standard
formatting.

Change-Id: I3767d480434c19225568f3c7d656dc8589197183
Reviewed-on: https://go-review.googlesource.com/c/go/+/338093
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-07-28 21:40:40 +00:00

28 lines
598 B
Go

// compile -G=3
// Copyright 2020 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.
// copied from cmd/compile/internal/types2/testdata/fixedbugs/issue39755.go
package p
func _[T interface{ ~map[string]int }](x T) {
_ = x == nil
}
// simplified test case from issue
type PathParamsConstraint interface {
~map[string]string | ~[]struct{ key, value string }
}
type PathParams[T PathParamsConstraint] struct {
t T
}
func (pp *PathParams[T]) IsNil() bool {
return pp.t == nil // this must succeed
}