nobu	2016-05-30 14:18:16 +0900 (Mon, 30 May 2016)

  New Revision: 55207

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=55207

  Log:
    variable.c: check length
    
    * variable.c (check_autoload_required): check length first before
      checking the first byte.

  Modified files:
    trunk/variable.c
Index: variable.c
===================================================================
--- variable.c	(revision 55206)
+++ variable.c	(revision 55207)
@@ -2028,7 +2028,7 @@ check_autoload_required(VALUE mod, ID id https://github.com/ruby/ruby/blob/trunk/variable.c#L2028
     }
     file = ele->feature;
     Check_Type(file, T_STRING);
-    if (!RSTRING_PTR(file) || !*RSTRING_PTR(file)) {
+    if (!RSTRING_LEN(file) || !*RSTRING_PTR(file)) {
 	rb_raise(rb_eArgError, "empty file name");
     }
     loading = RSTRING_PTR(file);

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