gc: print x[y:] correctly

R=ken2
CC=golang-dev
https://golang.org/cl/955041

diff --git a/src/cmd/gc/print.c b/src/cmd/gc/print.c
index f9799c5231c8b0eb829793ef120e18e6f65993da..8d85d04652968eb678ab419b66c2545a88264b7a 100644 (file)
--- a/src/cmd/gc/print.c
+++ b/src/cmd/gc/print.c
@@ -297,7 +297,8 @@ exprfmt(Fmt *f, Node *n, int prec)
                fmtprint(f, "[");
                exprfmt(f, n->right->left, 0);
                fmtprint(f, ":");
-               exprfmt(f, n->right->right, 0);
+               if(n->right->right != N)
+                       exprfmt(f, n->right->right, 0);
                fmtprint(f, "]");
                break;