erl_types: Fix map type parsing bug (ERL-177) #1115
Merged
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t_map/3
previously required callers to perform normalisation ofX:=none()
pairs, but ast_from_form/5
would sometimes fail to do so,this requirement is relaxed.
This caused a dialyzer crash when using remote types as values of
mandatory pairs with singleton keys.
Bug (ERL-177) reported and shrunk by Luke Imhoff.
This PR was previously #1114, but was rebased from maint to maint-19.