rust/tests/compile-fail/function_pointers/cast_fn_ptr2.rs

fn main() {
    fn f(_ : (i32,i32)) {}

    let g = unsafe {
        std::mem::transmute::<fn((i32,i32)), fn(i32)>(f)
    };

    g(42) //~ ERROR calling a function with argument of type (i32, i32) passing data of type i32
}