From: "mame (Yusuke Endoh)" <mame@...>
Date: 2012-04-09T12:43:58+09:00
Subject: [ruby-core:44207] [ruby-trunk - Feature #6265] Remove 'useless' 'concatenation' syntax


Issue #6265 has been updated by mame (Yusuke Endoh).


=begin
Matz,

> I agree with removing string concatenation in 3.0.

Okay.  Then, is the syntax deprecated in 2.0?
If so, it would be good to warn it.


 diff --git a/parse.y b/parse.y
 index 0393dc1..1726117 100644
 --- a/parse.y
 +++ b/parse.y
 @@ -3916,6 +3916,7 @@ string		: tCHAR
 		| string string1
 		    {
 		    /*%%%*/
 +			rb_warning0("string concatenation syntax is deprecated");
 			$$ = literal_concat($1, $2);
 		    /*%
 			$$ = dispatch2(string_concat, $1, $2);
 


Rodorigo,

> Yusuke, am I supposed to understand what you meant with the code in your last comment? If so, I didn't get it...

Sorry for the confusion.  The code is just a joke.
I can write such a code much easily without the syntax.

  eval$s=%q(puts(%(eval$s=%q(#$s)))#################################
  ##       ####       ####     ######       #####     ####        ##
  ##  #########  ###  ####  ##  #####  #########  ###  ######  #####
  ##  #########  ###  ####  ##  #####  #########  ###  ######  #####
  ##  #########  ###  ####  ##  #####  #########       ######  #####
  ##       ####       ####  ##  #####       ####  #l#  ######  #####
  #################################################################)

-- 
Yusuke Endoh <mame@tsg.ne.jp>
=end

----------------------------------------
Feature #6265: Remove 'useless' 'concatenation' syntax
https://bugs.ruby-lang.org/issues/6265#change-25734

Author: rosenfeld (Rodrigo Rosenfeld Rosas)
Status: Assigned
Priority: Normal
Assignee: mame (Yusuke Endoh)
Category: 
Target version: 3.0


What is wrong with this code:

some_method 'argument1', 'argument2' 'argument3'

Yes, the missing colon, but it is not always easy to notice that...

What is this ('concatenation' 'syntax') useful for?

Why writing ('some ' 'concatenation') instead of 'some concatenation'?

A missing colon between string arguments can lead to some bugs that may be hard to find, specially if the arguments are optional.

And I can't see any useful case where this allowed syntax for concatenation would help.


-- 
http://bugs.ruby-lang.org/