nobu	2018-08-17 10:37:58 +0900 (Fri, 17 Aug 2018)

  New Revision: 64401

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64401

  Log:
    ast.c (rb_ast_node_type): return frozen strings

  Modified files:
    trunk/ast.c
Index: ast.c
===================================================================
--- ast.c	(revision 64400)
+++ ast.c	(revision 64401)
@@ -155,7 +155,7 @@ rb_ast_node_type(VALUE self) https://github.com/ruby/ruby/blob/trunk/ast.c#L155
     struct ASTNodeData *data;
     TypedData_Get_Struct(self, struct ASTNodeData, &rb_node_type, data);
 
-    return rb_str_new_cstr(node_type_to_str(data->node));
+    return rb_fstring_cstr(node_type_to_str(data->node));
 }
 
 #define NEW_CHILD(ast, node) node ? ast_new_internal(ast, node) : Qnil

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