bors 3fe6ff74cf Auto merge of #16085 - Austaras:master, r=Veykril
fix: try obligation of `IndexMut` when infer

Closes #15842.

This issue arises because `K` is ambiguous if only inferred from `Index` trait, but is unique if inferred from `IndexMut`, but r-a doesn't use this info.
2024-01-03 14:18:13 +00:00
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