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Add manual_saturating_arithmetic lint #4498

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merged 3 commits into from
Sep 4, 2019
Merged

Add manual_saturating_arithmetic lint #4498

merged 3 commits into from
Sep 4, 2019

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sinkuu
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@sinkuu sinkuu commented Sep 4, 2019 •
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changelog: add manual_saturating_arithmetic lint

Fixes #1557. This lint detects manual saturating arithmetics like x.checked_add(10u32).unwrap_or(u32::max_value()) and suggests replacing with x.saturating_add(10u32).

@sinkuu sinkuu force-pushed the checked_arithmetic_unwrap branch from 54bf6f4 to 4960f79 Compare September 4, 2019 09:38
@sinkuu sinkuu changed the title Add checked_arith_unwrap_or lint Add manual_saturating_arithmetic lint Sep 4, 2019
flip1995
flip1995 approved these changes Sep 4, 2019
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Awesome! Completely new lint and I don't even have a single thing to complain about. 🎉

Thanks!

flip1995
flip1995 requested changes Sep 4, 2019
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Ha, found something 😄

clippy_lints/src/methods/mod.rs Outdated Show resolved Hide resolved
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flip1995 commented Sep 4, 2019

Thanks!

@bors r+

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bors commented Sep 4, 2019

📌 Commit c6fb9c8 has been approved by flip1995

bors added a commit that referenced this pull request Sep 4, 2019
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Auto merge of #4498 - sinkuu:checked_arithmetic_unwrap, r=flip1995
ffe57fa 
Add manual_saturating_arithmetic lint

changelog: add `manual_saturating_arithmetic` lint

Fixes #1557. This lint detects manual saturating arithmetics like `x.checked_add(10u32).unwrap_or(u32::max_value())` and suggests replacing with `x.saturating_add(10u32)`.
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bors commented Sep 4, 2019

⌛ Testing commit c6fb9c8 with merge ffe57fa...

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tesuji commented Sep 4, 2019

I suggest using syntax::ast::LitIntType in syntax::ast::LitKind::Int. This would make the code clearer.

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sinkuu commented Sep 4, 2019

@Izutao There's LitIntType::Unsuffixed variant, so I'd need to rely on type information anyway.

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bors commented Sep 4, 2019

☀️ Test successful - checks-travis, status-appveyor
Approved by: flip1995
Pushing ffe57fa to master...

@bors bors merged commit c6fb9c8 into rust-lang:master Sep 4, 2019
@bors bors mentioned this pull request Sep 4, 2019
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@sinkuu sinkuu deleted the checked_arithmetic_unwrap branch September 4, 2019 15:02
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Lint to suggest .saturating_add/sub(x) for .checked_add/sub(x).unwrap_or(MAX/MIN)
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