mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 17:24:06 +00:00
19 lines
642 B
Rust
19 lines
642 B
Rust
#![feature(trace_macros)]
|
|
|
|
fn main() {
|
|
trace_macros!(); //~ ERROR trace_macros! accepts only `true` or `false`
|
|
trace_macros!(1); //~ ERROR trace_macros! accepts only `true` or `false`
|
|
trace_macros!(ident); //~ ERROR trace_macros! accepts only `true` or `false`
|
|
trace_macros!(for); //~ ERROR trace_macros! accepts only `true` or `false`
|
|
trace_macros!(true,); //~ ERROR trace_macros! accepts only `true` or `false`
|
|
trace_macros!(false 1); //~ ERROR trace_macros! accepts only `true` or `false`
|
|
|
|
|
|
// should be fine:
|
|
macro_rules! expando {
|
|
($x: ident) => { trace_macros!($x) }
|
|
}
|
|
|
|
expando!(true);
|
|
}
|