Abstract asymmetry

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module ClassMethods
  abstract def bar : String
end

abstract class Foo
  # This allows me to declare an abstract class method.
  extend ClassMethods

  # This doesn't compile, even though it would do the same as above.
  abstract def self.bar : String
end
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Related: Abstract def class methods (e.g. constructors) · Issue #5956 · crystal-lang/crystal · GitHub.

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