From 1b31c37428d48ab3e5e4b86a6851293418fbf328 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Mon, 13 Dec 2010 16:51:19 -0500
Subject: [PATCH] gc: issue 1231

Fixes #1231.

R=ken2
CC=golang-dev
https://golang.org/cl/3627041
---
 src/cmd/gc/gen.c |  2 +-
 test/closure.go  | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/cmd/gc/gen.c b/src/cmd/gc/gen.c
index 8144fabaa8..04af5a7bb1 100644
--- a/src/cmd/gc/gen.c
+++ b/src/cmd/gc/gen.c
@@ -433,7 +433,7 @@ cgen_discard(Node *nr)
 
 	switch(nr->op) {
 	case ONAME:
-		if(!(nr->class & PHEAP) && nr->class != PEXTERN && nr->class != PFUNC)
+		if(!(nr->class & PHEAP) && nr->class != PEXTERN && nr->class != PFUNC && nr->class != PPARAMREF)
 			gused(nr);
 		break;
 
diff --git a/test/closure.go b/test/closure.go
index 54e4cf8eae..3033c02ed8 100644
--- a/test/closure.go
+++ b/test/closure.go
@@ -98,4 +98,15 @@ func main() {
 		println("newfunc returned broken funcs")
 		panic("fail")
 	}
+
+	ff(1)
+}
+
+func ff(x int) {
+	call(func() {
+		_ = x
+	})
+}
+
+func call(func()) {
 }