From: hemant kumar <gethemant@...>
Date: 2007-12-21T22:17:27+09:00
Subject: Re: Problem with case statements


On Fri, 2007-12-21 at 21:01 +0900, Robert Klemme wrote:
> 2007/12/21, hemant kumar <gethemant@gmail.com>:
> > I have an innocent looking code:
> >
> > 54:    def find(*args)
> > 55:      options = args.extract_options!
> > 56:      validate_find_options(options)
> > 57:      case args.first
> > 58:      when :first: find_first(options)
> > 59:      when :all: find_all(options)
> > 60:      else raise "Invalid find"
> > 61:      end
> > 62:    end
> >
> >
> > Now, above case statement totally blows up with Ruby 1.9:
> >
> > /home/hemant/push_server/lib/db_connection.rb:61: warning: else without
> > rescue is useless
> > /home/hemant/push_server/bin/boot.rb:34:in
> > `require': /home/hemant/push_server/lib/db_connection.rb:58: syntax
> > error, unexpected ':', expecting keyword_then or ',' or ';' or
> > '\n' (SyntaxError)
> >       when :first: find_first(options)
> >                   ^
> > /home/hemant/push_server/lib/db_connection.rb:59: syntax error,
> > unexpected keyword_when, expecting keyword_end
> >       when :all: find_all(options)
> >           ^
> > /home/hemant/push_server/lib/db_connection.rb:87: syntax error,
> > unexpected keyword_end, expecting $end
> > from /home/hemant/push_server/bin/boot.rb:34:in `<top (required)>'
> 
> Does the same error surface if you precede the colon with a space?
> Sorry, I don't have a 1.9 here to test this myself.
> 
> > However if i rewrite it like this, it works:
> >
> >     def find(*args)
> >       options = args.extract_options!
> >       validate_find_options(options)
> >       case args.first
> >       when :first
> >         find_first(options)
> >       when :all
> >         find_all(options)
> >       else
> >         raise "Invalid find"
> >       end
> >     end
> >
> > Why is this? Was this intended?
> 
> Maybe the form with colon is deprecated?
> 

Looks like they deprecated ":" in case statements.

Matz, shall we consider this as bug or change was unintentional?