mirror of
https://github.com/rust-lang/rust.git
synced 2024-10-31 06:22:00 +00:00
76 lines
2.3 KiB
Rust
76 lines
2.3 KiB
Rust
#![allow(unused_macros)]
|
|
|
|
// Tests that repetition matchers cannot match the empty token tree (since that would be
|
|
// ambiguous).
|
|
|
|
// edition:2018
|
|
|
|
macro_rules! foo {
|
|
( $()* ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $()+ ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $()? ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $(),* ) => {}; // PASS
|
|
( $(),+ ) => {}; // PASS
|
|
// `?` cannot have a separator...
|
|
( [$()*] ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( [$()+] ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( [$()?] ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( [$(),*] ) => {}; // PASS
|
|
( [$(),+] ) => {}; // PASS
|
|
// `?` cannot have a separator...
|
|
( $($()* $(),* $(a)* $(a),* )* ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $($()* $(),* $(a)* $(a),* )+ ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $($()* $(),* $(a)* $(a),* )? ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $($()? $(),* $(a)? $(a),* )* ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $($()? $(),* $(a)? $(a),* )+ ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $($()? $(),* $(a)? $(a),* )? ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $(a $(),* $(a)* $(a),* )* ) => {}; // PASS
|
|
( $($(a)+ $(),* $(a)* $(a),* )+ ) => {}; // PASS
|
|
( $($(a)+ $(),* $(a)* $(a),* )? ) => {}; // PASS
|
|
|
|
( $(a $(),* $(a)? $(a),* )* ) => {}; // PASS
|
|
( $($(a)+ $(),* $(a)? $(a),* )+ ) => {}; // PASS
|
|
( $($(a)+ $(),* $(a)? $(a),* )? ) => {}; // PASS
|
|
|
|
( $(a $()+)* ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $(a $()*)+ ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $(a $()+)? ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
( $(a $()?)+ ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
}
|
|
|
|
// Original Issue
|
|
|
|
macro_rules! make_vec {
|
|
(a $e1:expr $($(, a $e2:expr)*)*) => ([$e1 $($(, $e2)*)*]);
|
|
//~^ ERROR repetition matches empty token tree
|
|
}
|
|
|
|
fn main() {
|
|
let _ = make_vec![a 1, a 2, a 3];
|
|
}
|
|
|
|
// Minified Issue
|
|
|
|
macro_rules! m {
|
|
( $()* ) => {};
|
|
//~^ ERROR repetition matches empty token tree
|
|
}
|
|
|
|
m!();
|