<commit_before>require "singleton"

class Invariant
  include Singleton

  class AssertionError < StandardError
  end<commit_msg>Invariant::AssertionError inherits from Exception<commit_after>require "singleton"

class Invariant
  include Singleton

  class AssertionError < Exception
  end
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{'dir': 'git-commits-cleaned', 'id': '5127225', 'n_tokens_mistral': 81, 'n_tokens_neox': 78, 'n_words': 22}