style-guide: Format single associated type where
clauses on the same line
In particular, lifetime-generic associated types often have a `where Self: 'a` bound, which we can format on the same line.
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@ -43,6 +43,7 @@ include:
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- Miscellaneous `rustfmt` bugfixes.
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- Miscellaneous `rustfmt` bugfixes.
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- Use version-sort (sort `x8`, `x16`, `x32`, `x64`, `x128` in that order).
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- Use version-sort (sort `x8`, `x16`, `x32`, `x64`, `x128` in that order).
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- Change "ASCIIbetical" sort to Unicode-aware "non-lowercase before lowercase".
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- Change "ASCIIbetical" sort to Unicode-aware "non-lowercase before lowercase".
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- Format single associated type `where` clauses on the same line if they fit.
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## Rust 2015/2018/2021 style edition
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## Rust 2015/2018/2021 style edition
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@ -421,9 +421,20 @@ Format associated types like type aliases. Where an associated type has a
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bound, put a space after the colon but not before:
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bound, put a space after the colon but not before:
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```rust
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```rust
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pub type Foo: Bar;
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type Foo: Bar;
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```
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```
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If an associated type has no `=`, and has a `where` clause with only one entry,
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format the entire type declaration including the `where` clause on the same
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line if it fits:
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```rust
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type Item<'a> where Self: 'a;
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```
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If the associated type has a `=`, or if the `where` clause contains multiple
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entries, format it across multiple lines as with a type alias.
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## extern items
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## extern items
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When writing extern items (such as `extern "C" fn`), always specify the ABI.
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When writing extern items (such as `extern "C" fn`), always specify the ABI.
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