gc: fix send precedence
Test and fix case found by Robert.
Add receive inside send to tree too.
R=ken2
CC=golang-dev
https://golang.org/cl/3973052
diff --git a/src/cmd/gc/go.y b/src/cmd/gc/go.y
index 1060fdd..b711d36 100644
--- a/src/cmd/gc/go.y
+++ b/src/cmd/gc/go.y
@@ -93,9 +93,10 @@
%type <type> hidden_type_func
%type <type> hidden_type_recv_chan hidden_type_non_recv_chan
+%left LCOMM /* outside the usual hierarchy; here for good error messages */
+
%left LOROR
%left LANDAND
-%left LCOMM
%left LEQ LNE LLE LGE LLT LGT
%left '+' '-' '|' '^'
%left '*' '/' '%' '&' LLSH LRSH LANDNOT
diff --git a/test/chan/sendstmt.go b/test/chan/sendstmt.go
new file mode 100644
index 0000000..ee6f765
--- /dev/null
+++ b/test/chan/sendstmt.go
@@ -0,0 +1,37 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2011 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.
+
+// Test various parsing cases that are a little
+// different now that send is a statement, not a expression.
+
+package main
+
+func main() {
+ chanchan()
+ sendprec()
+}
+
+func chanchan() {
+ cc := make(chan chan int, 1)
+ c := make(chan int, 1)
+ cc <- c
+ select {
+ case <-cc <- 2:
+ default:
+ panic("nonblock")
+ }
+ if <-c != 2 {
+ panic("bad receive")
+ }
+}
+
+func sendprec() {
+ c := make(chan bool, 1)
+ c <- false || true // not a syntax error: same as c <- (false || true)
+ if !<-c {
+ panic("sent false")
+ }
+}
