cmd/gc: show duplicate key in error

R=ken2
CC=golang-dev
https://golang.org/cl/5728064

diff --git a/src/cmd/gc/typecheck.c b/src/cmd/gc/typecheck.c
index 90bd24964e1707e8c5a70ebc5cd82a2d6a000fbd..8b5578d250b2c6848319d7bcf2eecf0d6232e368 100644 (file)
--- a/src/cmd/gc/typecheck.c
+++ b/src/cmd/gc/typecheck.c
@@ -1964,7 +1964,7 @@ keydup(Node *n, Node *hash[], ulong nhash)
                b = cmp.val.u.bval;
                if(b) {
                        // too lazy to print the literal
-                       yyerror("duplicate key in map literal");
+                       yyerror("duplicate key %N in map literal", n);
                        return;
                }
        }