Fix gc_verify_internal_consistency error for pattern_matching in ripper

`gc_verify_internal_consistency` reports "found internal inconsistency"
for "test_pattern_matching.rb".

http://ci.rvm.jp/results/trunk-gc-asserts@ruby-sp2-docker/4501173

Ruby's parser manages objects by two different ways.

1. For parser

* markable node holds objects
* call `RB_OBJ_WRITTEN` with `p->ast` as parent
* `mark_ast_value` marks objects

2. For ripper

* unmarkable node, NODE_RIPPER/NODE_CDECL, holds objects
* call `rb_ast_add_mark_object`. This function calls `rb_hash_aset` then
  `RB_OBJ_WRITTEN` is called with `mark_hash` as parent
* `mark_hash` marks objects

However in current pattern_matching implementation

* markable node holds objects
* call `rb_ast_add_mark_object`

This commit fix it to be #2.

This was inconsistency however always `mark_hash` is
made young by `rb_ast_add_mark_object` call then objects
are not collected.

0 files changed, 0 insertions, 0 deletions