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//@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 = ""; //~ useless_concat
let x = "c"; //~ useless_concat
let x = "\""; //~ useless_concat
let x = "true"; //~ useless_concat
let x = "1"; //~ useless_concat
let x = "1.0000"; //~ useless_concat
let x = "1"; //~ useless_concat
let x = "1"; //~ useless_concat
let x = "1.0000"; //~ useless_concat
let x = "1.0000"; //~ useless_concat
let x = "a😀\n"; //~ useless_concat
let x = "a"; //~ useless_concat
let x = "1"; //~ useless_concat
println!("b: {}", "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!();
}
}
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