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// run
// 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.
// Test that type assertion panics mention the real interface type,
// not their shape type.
package main
import (
"fmt"
"runtime"
"strings"
)
func main() {
// The exact error message isn't important, but it should mention
// `main.T`, not `go.shape.int_0`.
if have := F[T](); !strings.Contains(have, "interface { T() main.T }") {
fmt.Printf("FAIL: unexpected panic message: %q\n", have)
}
}
type T int
func F[T any]() (res string) {
defer func() {
res = recover().(runtime.Error).Error()
}()
_ = interface{ T() T }(nil).(T)
return
}
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