Support placeholders becoming slices #1037
Merged
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When we setup trait-impls the type-alias are allowed to become any type
this interface was missing a visitor. We also need to support constraining
type-parameters behind slices.
The get_root interface is currently unsafe, it needs a flag for allowing
unsized and for keeping a map of adjustments along the way. This will
be added down the line when we support unsized method resolution.
Fixes #1034
Addresses #849