src/test/run-pass/hygiene/issue-47312.rs

// run-pass
// ignore-pretty pretty-printing is unhygienic

#![feature(decl_macro)]
#![allow(unused)]

mod foo {
    pub macro m($s:tt, $i:tt) {
        $s.$i
    }
}

mod bar {
    struct S(i32);
    fn f() {
        let s = S(0);
        ::foo::m!(s, 0);
    }
}

fn main() {}