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ee6914a45b
A few borrowck tweaks to improve 2024 edition migration lints See first two commits' changes to test outputs. Test coverage in this area is kinda weak, but I think it affects more cases than this (like the craters that will begin to trigger the `tail_expr_drop_order` tests in #134523). Third commit is a drive-by change that removes a deref hack from `UseSpans` which doesn't really improve diagnostics much.
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