File: arguments.rs

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#![feature(decl_macro)]

macro m($t:ty, $e:expr) {
    mod foo {
        #[allow(unused)]
        struct S;
        pub(super) fn f(_: $t) {}
    }
    foo::f($e);
}

fn main() {
    struct S;
    m!(S, S); //~ ERROR cannot find type `S` in this scope
}