mirror of https://go.googlesource.com/go
35 lines
722 B
Go
35 lines
722 B
Go
// run
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// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test that type assertion panics mention the real interface type,
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// not their shape type.
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package main
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import (
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"fmt"
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"runtime"
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"strings"
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)
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func main() {
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// The exact error message isn't important, but it should mention
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// `main.T`, not `go.shape.int_0`.
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if have := F[T](); !strings.Contains(have, "interface { T() main.T }") {
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fmt.Printf("FAIL: unexpected panic message: %q\n", have)
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}
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}
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type T int
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func F[T any]() (res string) {
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defer func() {
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res = recover().(runtime.Error).Error()
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}()
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_ = interface{ T() T }(nil).(T)
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return
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}
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