From a1aafd8b28ada0d40e2cb25fb0762ae171eec558 Mon Sep 17 00:00:00 2001 From: Robert Griesemer Date: Mon, 17 Dec 2018 11:33:42 -0800 Subject: [PATCH] cmd/compile: generate interface method expression wrapper for error.Error A prior optimization (https://golang.org/cl/106175) removed the generation of unnecessary method expression wrappers, but also eliminated the generation of the wrapper for error.Error which was still required. Special-case error type in the optimization. Fixes #29304. Change-Id: I54c8afc88a2c6d1906afa2d09c68a0a3f3e2f1e3 Reviewed-on: https://go-review.googlesource.com/c/154578 Reviewed-by: Brad Fitzpatrick --- src/cmd/compile/internal/gc/subr.go | 5 +++-- test/fixedbugs/issue29304.go | 19 +++++++++++++++++++ 2 files changed, 22 insertions(+), 2 deletions(-) create mode 100644 test/fixedbugs/issue29304.go diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go index 629186829a..2a976dc4f0 100644 --- a/src/cmd/compile/internal/gc/subr.go +++ b/src/cmd/compile/internal/gc/subr.go @@ -1517,8 +1517,9 @@ func genwrapper(rcvr *types.Type, method *types.Field, newnam *types.Sym) { return } - // Only generate I.M wrappers for I in I's own package. - if rcvr.IsInterface() && rcvr.Sym != nil && rcvr.Sym.Pkg != localpkg { + // Only generate I.M wrappers for I in I's own package + // but keep doing it for error.Error (was issue #29304). + if rcvr.IsInterface() && rcvr.Sym != nil && rcvr.Sym.Pkg != localpkg && rcvr != types.Errortype { return } diff --git a/test/fixedbugs/issue29304.go b/test/fixedbugs/issue29304.go new file mode 100644 index 0000000000..47bc99f9ca --- /dev/null +++ b/test/fixedbugs/issue29304.go @@ -0,0 +1,19 @@ +// run + +// Copyright 2018 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. + +// Verify that relocation target go.builtin.error.Error +// is defined and the code links and runs correctly. + +package main + +import "errors" + +func main() { + err := errors.New("foo") + if error.Error(err) != "foo" { + panic("FAILED") + } +} -- 2.50.0