https://git.ruby-lang.org/ruby.git/commit/?id=33f54da15b

From 33f54da15ba137fc1569016f5caa492c1a57eb4d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 23 Jul 2019 16:18:40 +0900
Subject: Support memsize of AST


diff --git a/ast.c b/ast.c
index a1af214..4c6477d 100644
--- a/ast.c
+++ b/ast.c
@@ -22,9 +22,16 @@ node_gc_mark(void *ptr) https://github.com/ruby/ruby/blob/trunk/ast.c#L22
     rb_gc_mark((VALUE)data->ast);
 }
 
+static size_t
+node_memsize(const void *ptr)
+{
+    struct ASTNodeData *data = (struct ASTNodeData *)ptr;
+    return rb_ast_memsize(data->ast);
+}
+
 static const rb_data_type_t rb_node_type = {
     "AST/node",
-    {node_gc_mark, RUBY_TYPED_DEFAULT_FREE, 0,},
+    {node_gc_mark, RUBY_TYPED_DEFAULT_FREE, node_memsize,},
     0, 0,
     RUBY_TYPED_FREE_IMMEDIATELY,
 };
-- 
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