From: Luke Ivers <lukeivers@...>
Date: 2007-02-08T06:46:56+09:00
Subject: Defining <<

I'm not 100% how exactly to search to find out if someone else has posed
this question, but why does the following happen?

Given:

class Hash
  def << (key, val=nil)
    self.store(key, val)
  end
end

h = {}
h << 'test'
h << 'test', 'bob'

Gives back:

test.rb:9: parse error, unexpected ',', expecting $
h << 'test', 'bob'

If I change the last line to:

h << ('test', 'bob')

I get back:

test.rb:9: parse error, unexpected ',', expecting ')'
h << ('test', 'bob')

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