map -package:containers -package:charset -package:base-compat -package:conduit -package:bytestring -package:case-insensitive -package:base package:ghc -is:exact is:module

The assignment of virtual registers to stack slots
RoughMap is an approximate finite map data structure keyed on [RoughMatchTc]. This is useful when keying maps on lists of Types (e.g. an instance head).