mame	2017-11-09 10:32:11 +0900 (Thu, 09 Nov 2017)

  New Revision: 60722

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60722

  Log:
    use `rb_ast_dispose` instead of `rb_ast_free`
    
    `rb_ast_dispose` calls `rb_gc_writebarrier_remember`.  Unless we call
    it, the marked objects may not be GC'ed until `rb_ast_t` is GC'ed.

  Modified files:
    trunk/parse.y
Index: parse.y
===================================================================
--- parse.y	(revision 60721)
+++ parse.y	(revision 60722)
@@ -12109,7 +12109,7 @@ ripper_parse0(VALUE parser_v) https://github.com/ruby/ruby/blob/trunk/parse.y#L12109
     parser_prepare(parser);
     parser->ast = rb_ast_new();
     ripper_yyparse((void*)parser);
-    rb_ast_free(parser->ast);
+    rb_ast_dispose(parser->ast);
     parser->ast = 0;
     return parser->result;
 }

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