runtime: select bug

The sanity checking in pass 2 is wrong
when a select is offering to communicate in
either direction on a channel and neither case
is immediately ready.

R=ken2
CC=golang-dev
https://golang.org/cl/3991047

1 files changed, 9 insertions, 0 deletions

diff --git a/test/chan/select3.go b/test/chan/select3.go
index 9877b12a98..47941063c0 100644
--- a/test/chan/select3.go
+++ b/test/chan/select3.go
@@ -196,4 +196,13 @@ func main() {
 		case closedch <- 7:
 		}
 	})
+	
+	// select should not get confused if it sees itself
+	testBlock(always, func() {
+		c := make(chan int)
+		select {
+		case c <- 1:
+		case <-c:
+		}
+	})
 }