Matthias Krüger 802f71b294
Rollup merge of #118112 - compiler-errors:index-ambiguity-ice, r=aliemjay
Don't ICE when ambiguity is found when selecting `Index` implementation in typeck

Fixes #118111

The problem here is when we're manually "selecting" an impl for `base_ty: Index<?0>`, we don't consider placeholder region errors (leak check) or ambiguous predicates. Those can lead to us not actually emitting any fulfillment errors on line 3131.
2023-11-21 23:46:20 +01:00
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