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■ [Ruby][Rails]colon will be obsoleted; use semicolon

先日、新しいマシンに Rails 環境を作ってみたところ、 「colon will be obsoleted; use semicolon」という警告が大量に発生しました。

% ruby script/server
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:169: warning: colon will be obsoleted; use semicolon
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:170: warning: colon will be obsoleted; use semicolon
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:171: warning: colon will be obsoleted; use semicolon
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/json/encoders/core.rb:24: warning: colon will be obsoleted; use semicolon
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/json/encoders/core.rb:25: warning: colon will be obsoleted; use semicolon
...

調べてみると、これはつい最近 Ruby に入った変更が原因のようです。

http://www.ruby-lang.org/cgi-bin/cvsweb.cgi/ruby/parse.y.diff?r1=1.307.2.36;r2=1.307.2.37

--- ruby/parse.y	2006/06/20 16:41:08	1.307.2.36
+++ ruby/parse.y	2006/07/13 15:42:48	1.307.2.37
@@ -2,8 +2,8 @@

   parse.y -

-  $Author: nobu $
-  $Date: 2006/06/20 16:41:08 $
+  $Author: matz $
+  $Date: 2006/07/13 15:42:48 $
   created at: Fri May 28 18:02:42 JST 1993

   Copyright (C) 1993-2003 Yukihiro Matsumoto
@@ -1731,6 +1731,11 @@ primary_value 	: primary

 then		: term
 		| ':'
+		    {
+		        rb_warn("colon will be obsoleted; use semicolon");
+			value_expr($1);
+			$$ = $1;
+		    }
 		| kTHEN
 		| term kTHEN
 		;

しかし、ここにコロンが書けたなんて初めて知りました。

% ruby -ve'if false: true end'
ruby 1.8.5 (2006-07-14) [i686-linux]
-e:1: warning: colon will be obsoleted; use semicolon