src/test/ui/lint/rfc-2457-non-ascii-idents/lint-confusable-idents.rs

#![deny(confusable_idents)]
#![allow(uncommon_codepoints, non_upper_case_globals)]

const ｓ: usize = 42;
const s_s: usize = 42;

fn main() {
    let s = "rust"; //~ ERROR identifier pair considered confusable
    let ｓ_ｓ = "rust2"; //~ ERROR identifier pair considered confusable
    not_affected();
}

fn not_affected() {
    let s1 = 1;
    let sl = 'l';
}