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| author | bors <bors@rust-lang.org> | 2018-03-17 23:22:57 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2018-03-17 23:22:57 +0000 |
| commit | ca6a98426192f838cc90a18709f92d425b86029e (patch) | |
| tree | aad9717ff8dca9636794c782148b0729b46090e0 /src/libsyntax/print | |
| parent | adf2135adc4a65a78ba053f04c29d7fe0468eb87 (diff) | |
| parent | ed5ea5c705ccea7d2eef1558530e87d2dbb88be7 (diff) | |
| download | rust-ca6a98426192f838cc90a18709f92d425b86029e.tar.gz rust-ca6a98426192f838cc90a18709f92d425b86029e.zip | |
Auto merge of #48842 - petrochenkov:under, r=nikomatsakis
syntax: Make `_` a reserved identifier
Why:
- Lexically `_` is an identifier.
- Internally it makes implementation of `use Trait as _;` (https://github.com/rust-lang/rust/issues/48216) and some other things cleaner.
- We prevent the externally observable effect of `_` being accepted by macros expecting `ident` by treating `_` specially in the `ident` matcher:
```rust
macro_rules! m {
($i: ident) => { let $i = 10; }
}
m!(_); // Still an error
```
Diffstat (limited to 'src/libsyntax/print')
| -rw-r--r-- | src/libsyntax/print/pprust.rs | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs index 1cf2b7a44bc..36698a86374 100644 --- a/src/libsyntax/print/pprust.rs +++ b/src/libsyntax/print/pprust.rs @@ -252,7 +252,6 @@ pub fn token_to_string(tok: &Token) -> String { /* Name components */ token::Ident(s) => s.to_string(), token::Lifetime(s) => s.to_string(), - token::Underscore => "_".to_string(), /* Other */ token::DocComment(s) => s.to_string(), |