rust/tests/ui/proc-macro/issue-36935.rs

// aux-build:test-macros.rs
// needs-unwind proc macro panics to report errors

#[macro_use]
extern crate test_macros;

#[derive(Identity, Panic)] //~ ERROR proc-macro derive panicked
struct Baz {
    //~^ ERROR the name `Baz` is defined multiple times
    a: i32,
    b: i32,
}

fn main() {}