Permit inline :must =>

I initially thought perhaps I could get away with something like:

  require 'doodle'

  class TypeCheck
    def TypeCheck.fixed_length(length)
      ["be length == %d" % [length], lambda { |value|  value.to_s.length == length } ]
    end
    def TypeCheck.boolean
      ["be true or false", lambda { |value| value.kind_of?(TrueClass) or value.kind_of?(FalseClass) }]
    end
  end

  class TestCaseX < Doodle 
    has :a_char, :kind => String, :must => TypeCheck.fixed_length(1)
    has :a_bool, :must => TypeCheck.boolean
  end

  TestCaseX.new( :a_char => "Whatever the heck I want", :a_bool => "False-or-not" )

The idea being able to fake a Type Constraint system and get reusable composable validation. (I've been using Perl's Moose for a long time :) )

But alas, not only does it not work as expected, I don't even get warnings/errors that :must is being discarded wholesale.

:from is similarly without warning/error, but asking to mimic the parts of Moose Type constraints here might be too much to ask.