Rollup merge of #151373 - issue-151300, r=lcnr Fix an ICE on transmute goals with placeholders in `param_env` Fixes rust-lang/rust#151300 The next solver short-circuits `consider_builtin_transmute_candidate` when the goal contains non-region placeholders, since `rustc_transmute` does not support type parameters. However, this check should likely be refined to apply only to the predicate itself: excess bounds with type params in the param env can cause the goal to be rejected even when its predicate trivially holds. r? types
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