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https://github.com/golang/go
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8ee9bca272
If a type switch case expression has failed typechecking, the case body is likely to also fail with confusing or spurious errors. Suppress typechecking the case body when this happens. Fixes #28926 Change-Id: Idfdb9d5627994f2fd90154af1659e9a92bf692c4 Reviewed-on: https://go-review.googlesource.com/c/158617 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
25 lines
664 B
Go
25 lines
664 B
Go
// errorcheck
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// Copyright 2018 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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package main
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type Stringer interface {
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String() string
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}
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func main() {
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var e interface{}
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switch e := e.(type) {
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case G: // ERROR "undefined: G"
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e.M() // ok: this error should be ignored because the case failed its typecheck
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case E: // ERROR "undefined: E"
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e.D() // ok: this error should be ignored because the case failed its typecheck
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case Stringer:
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// ok: this error should not be ignored to prove that passing legs aren't left out
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_ = e.(T) // ERROR "undefined: T"
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}
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}
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