nobu	2018-04-29 08:31:32 +0900 (Sun, 29 Apr 2018)

  New Revision: 63297

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63297

  Log:
    range.c: endless symbol range
    
    * range.c (range_each): shortcirtuit endless symbol range too, as
      well as `#step`.

  Modified files:
    trunk/range.c
Index: range.c
===================================================================
--- range.c	(revision 63296)
+++ range.c	(revision 63297)
@@ -813,9 +813,14 @@ range_each(VALUE range) https://github.com/ruby/ruby/blob/trunk/range.c#L813
 	    rb_yield(LONG2FIX(i));
 	}
     }
-    else if (SYMBOL_P(beg) && SYMBOL_P(end)) { /* symbols are special */
+    else if (SYMBOL_P(beg) && (NIL_P(end) || SYMBOL_P(end))) { /* symbols are special */
 	beg = rb_sym2str(beg);
-	rb_str_upto_each(beg, rb_sym2str(end), EXCL(range), sym_each_i, 0);
+	if (NIL_P(end)) {
+	    rb_str_upto_endless_each(beg, sym_each_i, 0);
+	}
+	else {
+	    rb_str_upto_each(beg, rb_sym2str(end), EXCL(range), sym_each_i, 0);
+	}
     }
     else {
 	VALUE tmp = rb_check_string_type(beg);

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