Substitute type params in default type params using them.#11982
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bors merged 1 commit intorust-lang:masterfrom Feb 2, 2014
Merged
Substitute type params in default type params using them.#11982bors merged 1 commit intorust-lang:masterfrom
bors merged 1 commit intorust-lang:masterfrom
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FP: `needless_return_with_question_mark` with implicit Error Conversion Return with a question mark was triggered in situations where the `?` desuraging was performing error conversion via `Into`/`From`. The desugared `?` produces a match over an expression with type `std::ops::ControlFlow<B,C>` with `B:Result<Infallible, E:Error>` and `C:Result<_, E':Error>`, and the arms perform the conversion. The patch adds another check in the lint that checks that `E == E'`. If `E == E'`, then the `?` is indeed unnecessary. changelog: False Positive: [`needless_return_with_question_mark`] when implicit Error Conversion occurs. fixes: rust-lang#11982
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Fixes #11964 and closes #8998.