From: Matthew Moss <matthew.moss.coder@...>
Date: 2006-03-13T10:45:20+09:00
Subject: Array#inject with hash as initial, unexpected error

(On Mac OS X 10.4.5, Ruby 1.8.4)

 Okay, so:

> [1, 2, 3].inject(0) { |s, v| s += v }
=> 6

and:

> [1, 2, 3].inject([]) { |a, v| a << v**2 }
=> [1, 4, 9]

but:

> [1, 2, 3].inject({}) { |h, v| h[v] = v**2 }
=> NoMethodError: undefined method `[]=' for 1:Fixnum


What gives?
I've tried replacing {} with Hash.new and a couple other variants without luck.