mirror of https://github.com/rust-lang/rust
28 lines
769 B
Rust
28 lines
769 B
Rust
#![deny(unused_macro_rules)]
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// To make sure we are not hitting this
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#![deny(unused_macros)]
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macro_rules! num {
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(one) => { 1 };
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// Most simple (and common) case
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(two) => { compile_error!("foo"); };
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// Some nested use
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(two_) => { foo(compile_error!("foo")); };
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(three) => { 3 };
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(four) => { 4 }; //~ ERROR: rule #5 of macro
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}
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const _NUM: u8 = num!(one) + num!(three);
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// compile_error not used as a macro invocation
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macro_rules! num2 {
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(one) => { 1 };
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// Only identifier present
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(two) => { fn compile_error() {} }; //~ ERROR: rule #2 of macro
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// Only identifier and bang present
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(two_) => { compile_error! }; //~ ERROR: rule #3 of macro
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(three) => { 3 };
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}
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const _NUM2: u8 = num2!(one) + num2!(three);
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fn main() {}
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