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go/test/fixedbugs/issue49005b.go
Robert Griesemer 254c497e5c cmd/compile, types2: better error message for invalid type assertion
This CL addresses the 2nd part of the issue below.

- For types2, now use the same error messages as the compiler in this case.
- Make the mechanism for reporting clarifying error messages handle the case
  where we don't have additional position information.
- Provide context information (type assertion vs type switch).

Fixes #49005.

Change-Id: I4eeaf4f0c3f2f8735b63993778f58d713fef21ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/356512
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-10-19 17:01:35 +00:00

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Go

// errorcheck
// 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
type T interface{ M() }
func F() T
var _ = F().(*X) // ERROR "impossible type assertion:( F\(\).\(\*X\))?\n\t\*X does not implement T \(missing M method\)"
type X struct{}