Add more cases to the useless_conversion lint
#13756
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The hits in lintcheck are true positives. |
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Lookup code will be simplified when rust-lang/rust#133686 is merged and synchronized with Clippy. |
The new cases are `x.map(f)` and `x.map_err(f)` when `f` is `Into::into` or `From::from` with the same input and output types.
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| // Necessary for `core::ops::control_flow::ControlFlow` until a diagnostic item |
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Could you add FIXME: Add ControlFlow diagnostic item, so that in the future we can add necessary diagnostic items in masse.
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Will do. My PR has been merged into rust-lang so we should get it at the next sync.
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| if is_trait_method(cx, expr, sym::Iterator) { |
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Do we really want to lint for any methods of Iterator? What would the use case for this branch?
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This only activates for the recognized methods (map_*), no other methods of Iterator will trigger that.
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- `ControlFlow::map_break()` - `ControlFlow::map_continue()` - `Iterator::map()`
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Done |
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The new cases are the application of
Into::intoorFrom::fromthrough the following functions with no effect:Option::map()Result::map()andResult::map_err()ControlFlow::map_break()andControlFlow::map_err()Iterator::map()changelog: [
useless_conversion]: detect useless calls toInto::intoandFrom::fromapplication throughmap*methods