13f8d073fe
Enable fall through past $:lifetime matcher
```rust
macro_rules! is_lifetime {
($lifetime:lifetime) => { true };
($other:tt) => { false };
}
fn main() {
println!("{}", is_lifetime!('lifetime));
println!("{}", is_lifetime!(@));
}
```
Before this fix, the `is_lifetime!` invocation would fail to compile with:
```
error: expected a lifetime, found `@`
--> src/main.rs:8:33
|
8 | println!("{}", is_lifetime!(@));
| ^
```
Fixes #50903.
Fixes #51477.
r? @kennytm
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|---|---|---|
| .. | ||
| diagnostics | ||
| ext | ||
| parse | ||
| util | ||
| ast.rs | ||
| attr.rs | ||
| build.rs | ||
| Cargo.toml | ||
| codemap.rs | ||
| config.rs | ||
| diagnostic_list.rs | ||
| entry.rs | ||
| feature_gate.rs | ||
| fold.rs | ||
| json.rs | ||
| lib.rs | ||
| ptr.rs | ||
| README.md | ||
| show_span.rs | ||
| std_inject.rs | ||
| str.rs | ||
| test_snippet.rs | ||
| test.rs | ||
| tokenstream.rs | ||
| visit.rs | ||
The syntax crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), parser, pretty-printer,
lexer, macro expander, and utilities for traversing ASTs.
For more information about how these things work in rustc, see the rustc guide: