Return Option rather than fail for shift_ref, mut_shift_ref, pop_ref, mut_pop_ref, and mut_last #11944
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bors
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flip1995
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…r=Jarcho Check $CARGO before $PATH Currently, clippy will ignore $CARGO when spawning cargo commands, which can be problematic for `cargo clippy` and interop with other tools. This commit induces clippy to respect $CARGO in every case it seems likely to matter. Fixes: - rust-lang#11943 changelog: clippy now respects setting the `CARGO` environment variable
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Closes #11733