Bug #1618: Kernel.catch without Arguments

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 1.9.2dev (2009-06-01 trunk 23614) [i686-linux]

[runpaint (Run Paint Run Run)]

=begin
In 1.9 Kernel.catch can be called with neither a symbol nor object to catch, e.g.:

 catch { }

In 1.8 this usage raised an ArgumentError.

The test/ruby/test_system.rb file from the Ruby repository contains:

 def valid_syntax?(code, fname)
   code.force_encoding("ascii-8bit")
   code = code.sub(/\A(?:\s*\#.*$)*(\n)?/n) {
     "#$&#{"\n" if $1 && !$2}BEGIN{throw tag, :ok}\n"
   }
   catch {|tag| eval(code, binding, fname, 0)}
 end

With the help of #rubyspec, I've reduced this down to:

 catch {|wtf| throw wtf}

This passes an instance of Object into the block.

So, assuming that this must be a feature, could the documentation be updated with an explanation, and suggestions proffered as to the purpose of this invocation?
=end

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

=begin
Applied in changeset r23675.
=end