Obscure error when using named argument with reserved name

[oprypin]

This used to work before Crystal 0.26

class C
  def initialize(@abstract : Bool = false, *args, **kwargs)
  end
end

func = C.new(abstract: true)

But now it gives an error

Error in line 6: read before assignment to local variable '__temp_270'

https://carc.in/#/r/4ro0

Maybe it shouldn't have worked but this kind of error message will not suffice.

[oprypin]

This should work though

def f(abstract internal_name, **kwargs)
end

f(abstract: true)

Error in line 4: read before assignment to local variable '__temp_269'

[Sija]

Seems like a bug to me, IMO it should possible to use reserved keywords as ivar/property names.