41 lines
1.2 KiB
Rust
41 lines
1.2 KiB
Rust
//@aux-build:proc_macros.rs
|
|
|
|
#![warn(clippy::useless_concat)]
|
|
#![allow(clippy::print_literal)]
|
|
|
|
extern crate proc_macros;
|
|
use proc_macros::{external, with_span};
|
|
|
|
macro_rules! my_concat {
|
|
($fmt:literal $(, $e:expr)*) => {
|
|
println!(concat!("ERROR: ", $fmt), $($e,)*);
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let x = concat!(); //~ useless_concat
|
|
let x = concat!('c'); //~ useless_concat
|
|
let x = concat!('"'); //~ useless_concat
|
|
let x = concat!(true); //~ useless_concat
|
|
let x = concat!(1f32); //~ useless_concat
|
|
let x = concat!(1.0000f32); //~ useless_concat
|
|
let x = concat!(1_f32); //~ useless_concat
|
|
let x = concat!(1_); //~ useless_concat
|
|
let x = concat!(1.0000_f32); //~ useless_concat
|
|
let x = concat!(1.0000_); //~ useless_concat
|
|
let x = concat!("a\u{1f600}\n"); //~ useless_concat
|
|
let x = concat!(r##"a"##); //~ useless_concat
|
|
let x = concat!(1); //~ useless_concat
|
|
println!("b: {}", concat!("a")); //~ useless_concat
|
|
// Should not lint.
|
|
let x = concat!("a", "b");
|
|
let local_i32 = 1;
|
|
my_concat!("{}", local_i32);
|
|
let x = concat!(file!(), "#L", line!());
|
|
|
|
external! { concat!(); }
|
|
with_span! {
|
|
span
|
|
concat!();
|
|
}
|
|
}
|