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Rollup merge of rust-lang#62010 - ecstatic-morse:kill-borrows-of-proj, r=pnkfelix
Kill conflicting borrows of places with projections.
Resolvesrust-lang#62007.
Due to a bug, the previous version of this check did not actually kill all conflicting borrows unless the borrowed place had no projections. Specifically, `sets.on_entry` will always be empty when `statement_effect` is called. It does not contain the set of borrows which are live at this point in the program.
@pnkfelix describes why this was not caught before in rust-lang#62007, and created an example where the current borrow checker failed unnecessarily. This PR adds their example as a test, but they will likely want to add some additional ones.
r? @pnkfelix
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