mirror of
https://github.com/golang/go
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04845fe78a
Before this CL we used to panic with "nil pointer dereference" because the value we're calling assignTo on is the zero Value. Provide a better error message. Fixes #28748 Change-Id: I7dd4c9e30b599863664d91e78cc45878d8b0052e Reviewed-on: https://go-review.googlesource.com/c/go/+/175440 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
33 lines
712 B
Go
33 lines
712 B
Go
// run
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package main
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import (
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"fmt"
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"reflect"
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"strings"
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)
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// Copyright 2019 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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func main() {
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defer func() {
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e := recover()
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if e == nil {
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panic("should have panicked")
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}
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text := fmt.Sprintf("%s", e) // handles both string and runtime.errorString
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if !strings.HasPrefix(text, "reflect:") {
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panic("wanted a reflect error, got this instead:\n" + text)
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}
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}()
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r := reflect.MakeFunc(reflect.TypeOf(func() error { return nil }),
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func(args []reflect.Value) []reflect.Value {
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var x [1]reflect.Value
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return x[:]
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}).Interface().(func() error)
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r()
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}
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