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| author | bors[bot] <bors[bot]@users.noreply.github.com> | 2018-10-04 08:02:19 +0100 |
|---|---|---|
| committer | bors[bot] <bors[bot]@users.noreply.github.com> | 2018-10-04 08:02:19 +0100 |
| commit | 7a025ad20169253d70bfae3773225404ec7aca46 (patch) | |
| tree | f4098b5b74e277867bf54c3404ccfda6fd3493d3 /README.md | |
| parent | c87fcb4ea5874a7307c1d9d1192e923f3ae2c922 (diff) | |
| parent | a55ef9b3ed66a057bb3e58ab698f26e58afb5b7d (diff) | |
Merge #93
93: Support leading pipe in match arms r=matklad a=DJMcNab
This adds support for match arms of the form:
```rust
<...>
| X | Y => <...>,
| X => <...>,
| 1..2 => <...>,
etc
```
# Implementation discussion
This just naïvely 'eats' a leading pipe if one is available. The equivalent line in the reference `libsyntax` is in [`parse_arm`](https://github.com/rust-lang/rust/blob/441519536c8bd138e8c651743249acd6814747a1/src/libsyntax/parse/parser.rs#L3552).
As noted in the comment linked above, this feature was formally introduced as a result of rust-lang/rfcs#1925. This feature is in active use in the [`rust-analyzer` codebase](https://github.com/matklad/rust-analyzer/blob/c87fcb4ea5874a7307c1d9d1192e923f3ae2c922/crates/ra_syntax/src/syntax_kinds/generated.rs#L231)
I have added some tests for this feature, but maybe more would be required
EDIT: Always looking for feedback - is this PR description over-engineered?
Co-authored-by: Daniel McNab <[email protected]>
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