ast: When checking actual type par against constraints, do not walk through inh chain of choice Fix #3362 #3386
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Since choice types cannot be called, the result of a call to
choice X Y Z
isvoid
, which lead to choice types that inherit from choice to be accepted to match any constraint. This patch fixes this by not walking through the parents if the actual type parameter is a choice.This also adds a regression test with the original code from #3362 and a minimalistic example.