From: B Kelly <redmine@...>
Date: 2010-12-24T09:30:59+09:00
Subject: [ruby-core:33851] [Ruby 1.9-Bug#4198][Open] parse error involving spaceship operator

Bug #4198: parse error involving spaceship operator
http://redmine.ruby-lang.org/issues/show/4198

Author: B Kelly
Status: Open, Priority: Normal
Category: core, Target version: 1.9.2
ruby -v: ruby 1.9.2p110 (2010-12-20 revision 30269) [i386-darwin10.4.0]

Hi,

I'm not sure if this is a bug?  I'm getting a parse error on
the last line of the following code, unless I add parenthesis:

op-test-simple.rb
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class Opper
  def / (other)
    self
  end
  def + (other)
    self
  end
  def <=> (other)
    self
  end
end

foo = Opper.new("foo")
bar = Opper.new("bar")
baz = Opper.new("baz")
quux = Opper.new("quux")
joe = Opper.new("joe")
mama = Opper.new("mama")
so = Opper.new("so")
fat = Opper.new("fat")
quick = Opper.new("quick")
brown = Opper.new("brown")
fox = Opper.new("fox")

foo + bar /
baz + quux /
joe + mama <=> so + fat /
quick + brown <=> fox
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ ruby19 -v op-test-simple.rb
ruby 1.9.2p110 (2010-12-20 revision 30269) [i386-darwin10.4.0]
op-test-simple.rb:29: syntax error, unexpected tCMP
quick + brown <=> fox
                 ^
op-test-simple.rb:29: warning: useless use of a variable in void context


However, if parenthesis are added, like:

(quick + brown <=> fox)

or:

quick + (brown <=> fox)

then the parse error does not occur.


Regards,

Bill


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