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4c12f5d252
Don't ICE in layout computation for placeholder types We use `layout_of` for the built-in `PointerLike` trait to check if a type can be coerced to a `dyn*`. Since the new solver canonicalizes parameter types to placeholders, that code needs to be able to treat placeholders like params, and for the most part it does, **except** for a call to `is_trivially_sized`. This PR fixes that.