mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 17:24:06 +00:00
31 lines
1.1 KiB
Rust
31 lines
1.1 KiB
Rust
// Test that `...X` range-to patterns are syntactically invalid.
|
|
//
|
|
// See https://github.com/rust-lang/rust/pull/67258#issuecomment-565656155
|
|
// for the reason why. To summarize, we might want to introduce `...expr` as
|
|
// an expression form for splatting (or "untupling") in an expression context.
|
|
// While there is no syntactic ambiguity with `...X` in a pattern context,
|
|
// there's a potential confusion factor here, and we would prefer to keep patterns
|
|
// and expressions in-sync. As such, we do not allow `...X` in patterns either.
|
|
|
|
fn main() {}
|
|
|
|
#[cfg(FALSE)]
|
|
fn syntax() {
|
|
match scrutinee {
|
|
...X => {} //~ ERROR range-to patterns with `...` are not allowed
|
|
...0 => {} //~ ERROR range-to patterns with `...` are not allowed
|
|
...'a' => {} //~ ERROR range-to patterns with `...` are not allowed
|
|
...0.0f32 => {} //~ ERROR range-to patterns with `...` are not allowed
|
|
}
|
|
}
|
|
|
|
fn syntax2() {
|
|
macro_rules! mac {
|
|
($e:expr) => {
|
|
let ...$e; //~ ERROR range-to patterns with `...` are not allowed
|
|
}
|
|
}
|
|
|
|
mac!(0);
|
|
}
|