refactor: Generalize Substitutable::apply_ref #4499
Merged
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Makes
apply_ref
a proper visitor.Substituter
is kept (but should perhaps be renamed) and is extended with additional methods that allow the specificSubstututer
to inject logic forPolyType
. Through this we can implementmax_tvar
andfree_vars
in terms of the same visit method asapply
.Extracted from #4388