codegen/mir: support polymorphic InstanceDef
s
#69935
Merged
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cc #69925
This PR modifies the use of
subst_and_normalize_erasing_regions
on parts of the MIR bodies returned frominstance_mir
, so thatInstanceDef::CloneShim
andInstanceDef::DropGlue
(where there is a type) do not perform substitutions. This avoids double substitutions and enables polymorphicInstanceDef
s.r? @eddyb
cc @nikomatsakis