mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 07:14:28 +00:00
5134a04eaa
Some minor (English only) heroics are performed to print error messages like "5th rule of macro `m` is never used". The form "rule #5 of macro `m` is never used" is just as good and much simpler to implement.
50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
#![feature(decl_macro)]
|
|
#![deny(unused_macro_rules)]
|
|
// To make sure we are not hitting this
|
|
#![deny(unused_macros)]
|
|
|
|
// Most simple case
|
|
macro num {
|
|
(one) => { 1 },
|
|
(two) => { 2 }, //~ ERROR: rule #2 of macro
|
|
(three) => { 3 },
|
|
(four) => { 4 }, //~ ERROR: rule #4 of macro
|
|
}
|
|
const _NUM: u8 = num!(one) + num!(three);
|
|
|
|
// Check that allowing the lint works
|
|
#[allow(unused_macro_rules)]
|
|
macro num_allowed {
|
|
(one) => { 1 },
|
|
(two) => { 2 },
|
|
(three) => { 3 },
|
|
(four) => { 4 },
|
|
}
|
|
const _NUM_ALLOWED: u8 = num_allowed!(one) + num_allowed!(three);
|
|
|
|
// Check that macro calls inside the macro trigger as usage
|
|
macro num_rec {
|
|
(one) => { 1 },
|
|
(two) => {
|
|
num_rec!(one) + num_rec!(one)
|
|
},
|
|
(three) => { //~ ERROR: rule #3 of macro
|
|
num_rec!(one) + num_rec!(two)
|
|
},
|
|
(four) => {
|
|
num_rec!(two) + num_rec!(two)
|
|
},
|
|
}
|
|
const _NUM_RECURSIVE: u8 = num_rec!(four);
|
|
|
|
// No error if the macro is public
|
|
pub macro num_public {
|
|
(one) => { 1 },
|
|
(two) => { 2 },
|
|
(three) => { 3 },
|
|
(four) => { 4 },
|
|
}
|
|
const _NUM_PUBLIC: u8 = num_public!(one) + num_public!(three);
|
|
|
|
fn main() {}
|