From a0236882378717d745e596030d941dd9a987a84d Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Tue, 24 Jan 2012 07:00:15 +0000
Subject: [PATCH] compiler: Better error message for invalid use of predeclared
 function.

From-SVN: r183466
---
 gcc/go/gofrontend/expressions.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index ebecbbde200..037353072f3 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -1328,7 +1328,8 @@ Func_expression::get_tree_without_closure(Gogo* gogo)
   // can't take their address.
   if (fntype->is_builtin())
     {
-      error_at(this->location(), "invalid use of special builtin function %qs",
+      error_at(this->location(),
+	       "invalid use of special builtin function %qs; must be called",
 	       this->function_->name().c_str());
       return error_mark_node;
     }