From: Mark Hubbart <discord@...>
Date: 2004-07-18T03:23:03+09:00
Subject: Re: Bug? String literal %s{#{a}} cause irb to abort


On Jul 17, 2004, at 10:53 AM, Alexey Verkhovsky wrote:

> On Sat, 2004-07-17 at 20:34, Mark Hubbart wrote:
>> That's because newlines are valid delimiters in that context:
>
> Aha... now I understand.
> To take this hairsplitting exercise a little further,

:)

>  there is a slight
> difference between ruby and irb here:
>
> [alex@dhcp-89-2 alex]$ ruby
> %s
>
> -:2: empty symbol literal
> [alex@dhcp-89-2 alex]$
>
> [alex@dhcp-89-2 alex]$ irb
> irb(main):001:0> %s
> irb(main):002:0:
> irb(main):003:0>
> SyntaxError: compile error
> (irb):2: empty symbol literal
>         from (irb):3
>         from :0
> irb(main):004:0>
>
> So, ruby sees an error after two linefeeds, while irb does it only 
> after
> three.

In this test, I used a plus sign to indicate that the statement should 
continue to the next line:

mark@eMac% ruby
%s{} +
-:1: empty symbol literal
%s{} +
     ^

I think irb waits on the compilation until it gets a full statement; 
while ruby compiles at the smallest expression level (but still 
line-based). So, while irb will wait to see if you try to add anything 
after that empty symbol literal, ruby grabs it right away and shows you 
where you went wrong. :)

> I hope everybody can live with this :)

cheers,
Mark