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#![feature(decl_macro)]

struct X;

macro_rules! define_f_legacy { () => {
    fn f() {}
}}
macro define_g_modern() {
    fn g() {}
}

impl X {
   fn f() {} //~ ERROR duplicate definitions with name `f`
   fn g() {} // OK
}
impl X {
    define_f_legacy!();
}
impl X {
    define_g_modern!();
}

fn main() {}