parse.y: precedence of duplicated keys

* parse.y (assocs): concatenate splatted literal hashes.  the
  former key has precedence even if duplicated literal keys
  follow.  [ruby-core:65368] [Bug #10315]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47877 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index c0c9036641..768c0ca34e 100644
--- a/parse.y
+++ b/parse.y
@@ -4931,7 +4931,15 @@ assocs		: assoc
 		| assocs ',' assoc
 		    {
 		    /*%%%*/
-			$$ = list_concat($1, $3);
+			NODE *assocs = $1;
+			NODE *tail = $3;
+			if (assocs->nd_head &&
+			    !tail->nd_head && nd_type(tail->nd_next) == NODE_ARRAY &&
+			    nd_type(tail->nd_next->nd_head) == NODE_HASH) {
+			    /* DSTAR */
+			    tail = tail->nd_next->nd_head->nd_head;
+			}
+			$$ = list_concat(assocs, tail);
 		    /*%
 			$$ = rb_ary_push($1, $3);
 		    %*/