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Instantiate binders in supertrait_vtable_slot #131042

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supertrait_vtable_slot was previously using structural equality when probing for the vtable slot, which led to an ICE since we need a subtype match, not an exact match.

Fixes #131027

r? lcnr

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 29, 2024
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rustbot commented Sep 30, 2024

Some changes occurred in engine.rs, potentially modifying the public API of ObligationCtxt.

cc @lcnr, @compiler-errors

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ICE: None in traits/vtable.rs
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