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The existing code used Type.String() to obtain the name of a type; specifically type reflect.Method in this case. However, Type.String() formatting is intended for error messages and uses the format pkgpath.name instead of pkgname.name if a package (in this case package reflect) is imported multiple times. As a result, the reflect.Method type detection failed under peculiar circumstances (see the included test case). Thanks to https://github.com/ericlagergren for tracking down an easy way to make the bug disappear (which in turn directly led to the underlying cause). Fixes #19028. Change-Id: I1b9c5dfd183260a9be74969fe916a94146fc36da Reviewed-on: https://go-review.googlesource.com/45777 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
27 lines
575 B
Go
27 lines
575 B
Go
// Copyright 2017 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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import (
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"reflect"
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fake "./reflect" // 2nd package with name "reflect"
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)
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type T struct {
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_ fake.Type
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}
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func (T) f() {}
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func (T) G() (_ int) { return }
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func (T) H() (_, _ int) { return }
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func main() {
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var x T
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typ := reflect.TypeOf(x)
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for i := 0; i < typ.NumMethod(); i++ {
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_ = typ.Method(i) // must not crash
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}
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}
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