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