parse.y: fix GC problem of keyword rest argument

* parse.y (new_args_tail_gen): fix GC problem of keyword rest
  argument.  the wrapped struct should be bound to the wrapping node
  before assignment of child nodes, to get rid of the case the
  children are referred by only the struct pointer which is not a
  subject of GC.  [ruby-core:45744]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36161 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 9f9093b0bb..c10099126f 100644
--- a/parse.y
+++ b/parse.y
@@ -9289,8 +9289,11 @@ new_args_tail_gen(struct parser_params *parser, NODE *k, ID kr, ID b)
     int saved_line = ruby_sourceline;
     struct rb_args_info *args;
     NODE *kw_rest_arg = 0;
+    NODE *node;
 
     args = ALLOC(struct rb_args_info);
+    MEMZERO(args, struct rb_args_info, 1);
+    node = NEW_NODE(NODE_ARGS, 0, 0, args);
 
     args->block_arg      = b;
     args->kw_args        = k;
@@ -9302,7 +9305,7 @@ new_args_tail_gen(struct parser_params *parser, NODE *k, ID kr, ID b)
     args->kw_rest_arg    = kw_rest_arg;
 
     ruby_sourceline = saved_line;
-    return NEW_NODE(NODE_ARGS, 0, 0, args);
+    return node;
 }
 #endif /* !RIPPER */