mirror of https://github.com/rust-lang/rust
18 lines
333 B
Rust
18 lines
333 B
Rust
#![deny(unused_variables)]
|
|
macro_rules! make_var {
|
|
($struct:ident, $var:ident) => {
|
|
let $var = $struct.$var;
|
|
};
|
|
}
|
|
|
|
#[allow(unused)]
|
|
struct MyStruct {
|
|
var: i32,
|
|
}
|
|
|
|
fn main() {
|
|
let s = MyStruct { var: 42 };
|
|
make_var!(s, var); //~ ERROR unused variable: `var`
|
|
let a = 1; //~ ERROR unused variable: `a`
|
|
}
|