From: Ian Lance Taylor <iant@golang.org>
Date: Mon, 4 Jul 2022 19:20:36 +0000 (-0700)
Subject: compiler: better error message for unknown package name
X-Git-Tag: basepoints/gcc-14~5694
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ccc39d9e97ce24623aefae2097bff791e01619d9;p=thirdparty%2Fgcc.git

compiler: better error message for unknown package name

Fixes golang/go#51237

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/415994
---

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 7b1d3011fffe..461e2fdf2715 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-6479d5976c5d848ec6f5843041275723a00006b0
+a209dca9ec918535977dcab99fd9bb60986ffacd
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/gcc/go/gofrontend/parse.cc b/gcc/go/gofrontend/parse.cc
index a3c6f630a093..c93d82bba395 100644
--- a/gcc/go/gofrontend/parse.cc
+++ b/gcc/go/gofrontend/parse.cc
@@ -191,7 +191,11 @@ Parse::qualified_ident(std::string* pname, Named_object** ppackage)
   Named_object* package = this->gogo_->lookup(name, NULL);
   if (package == NULL || !package->is_package())
     {
-      go_error_at(this->location(), "expected package");
+      if (package == NULL)
+	go_error_at(this->location(), "reference to undefined name %qs",
+		    Gogo::message_name(name).c_str());
+      else
+	go_error_at(this->location(), "expected package");
       // We expect . IDENTIFIER; skip both.
       if (this->advance_token()->is_identifier())
 	this->advance_token();
diff --git a/gcc/testsuite/go.test/test/fixedbugs/issue27938.go b/gcc/testsuite/go.test/test/fixedbugs/issue27938.go
index ed974e642df5..aecc67678ac2 100644
--- a/gcc/testsuite/go.test/test/fixedbugs/issue27938.go
+++ b/gcc/testsuite/go.test/test/fixedbugs/issue27938.go
@@ -11,13 +11,13 @@
 package p
 
 type _ struct {
-	F sync.Mutex // ERROR "undefined: sync|expected package"
+	F sync.Mutex // ERROR "undefined: sync|expected package|reference to undefined name"
 }
 
 type _ struct {
-	sync.Mutex // ERROR "undefined: sync|expected package"
+	sync.Mutex // ERROR "undefined: sync|expected package|reference to undefined name"
 }
 
 type _ interface {
-	sync.Mutex // ERROR "undefined: sync|expected package|expected signature or type name"
+	sync.Mutex // ERROR "undefined: sync|expected package|expected signature or type name|reference to undefined name"
 }