nobu	2016-02-07 11:40:52 +0900 (Sun, 07 Feb 2016)

  New Revision: 53763

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=53763

  Log:
    ruby.c: show feature names
    
    * ruby.c (feature_option): show possible feature names when
      unknown argument is given.

  Modified files:
    trunk/ruby.c
Index: ruby.c
===================================================================
--- ruby.c	(revision 53762)
+++ ruby.c	(revision 53763)
@@ -765,6 +765,7 @@ feature_option(const char *str, int len, https://github.com/ruby/ruby/blob/trunk/ruby.c#L765
     }
     rb_warn("unknown argument for --%s: `%.*s'",
 	    enable ? "enable" : "disable", len, str);
+    rb_warn("features are [gems, did-you-mean, rubyopt, frozen-string-literal].");
 }
 
 static void

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