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43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
// Tests that `?` is a Kleene op and not a macro separator in the 2018 edition.
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//@ edition:2018
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macro_rules! foo {
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($(a)?) => {};
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}
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// The Kleene op `?` does not admit a separator before it.
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macro_rules! baz {
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($(a),?) => {}; //~ERROR the `?` macro repetition operator
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}
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macro_rules! barplus {
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($(a)?+) => {}; // ok. matches "a+" and "+"
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}
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macro_rules! barstar {
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($(a)?*) => {}; // ok. matches "a*" and "*"
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}
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pub fn main() {
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foo!();
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foo!(a);
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foo!(a?); //~ ERROR no rules expected the token `?`
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foo!(a?a); //~ ERROR no rules expected the token `?`
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foo!(a?a?a); //~ ERROR no rules expected the token `?`
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barplus!(); //~ERROR unexpected end of macro invocation
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barplus!(a); //~ERROR unexpected end of macro invocation
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barplus!(a?); //~ ERROR no rules expected the token `?`
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barplus!(a?a); //~ ERROR no rules expected the token `?`
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barplus!(a+);
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barplus!(+);
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barstar!(); //~ERROR unexpected end of macro invocation
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barstar!(a); //~ERROR unexpected end of macro invocation
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barstar!(a?); //~ ERROR no rules expected the token `?`
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barstar!(a?a); //~ ERROR no rules expected the token `?`
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barstar!(a*);
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barstar!(*);
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}
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