Fix/issue 152607 supertrait assoc type bound#156593
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…ormedness When forming a trait object like `dyn Sub<Assoc = String>` where `trait Sub: Super<Assoc: Copy>`, the compiler was not verifying that `String: Copy`. This allowed unsound code to compile, potentially leading to use-after-free vulnerabilities. The root cause was that both the old and new trait solvers used `explicit_super_predicates_of` which only yields `Self: SuperTrait` predicates, but not the associated type bounds from those supertraits. For example, `trait Sub: Super<Assoc: Copy>` expands to both `Self: Super` and `<Self as Super>::Assoc: Copy`, but only the first was being checked. This change switches to `explicit_implied_predicates_of` in both: - The old solver's `confirm_object_candidate` - The new solver's `predicates_for_object_candidate` This ensures that associated type bounds from supertraits are properly verified when constructing trait objects.
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changes to the core type system cc @lcnr |
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This tries to fix #152607.
This PR is based on #153518.
dyncase, so I have tried to fix it on my own, but I am not sure about the correctness of this fix.r? lcnr