src/tools/miri/tests/fail/function_pointers/abi_mismatch_array_vs_struct.rs

#![feature(portable_simd)]

// Some targets treat arrays and structs very differently. We would probably catch that on those
// targets since we check the `PassMode`; here we ensure that we catch it on *all* targets
// (in particular, on x86-64 the pass mode is `Indirect` for both of these).
struct S(
    #[allow(dead_code)] i32,
    #[allow(dead_code)] i32,
    #[allow(dead_code)] i32,
    #[allow(dead_code)] i32,
);
type A = [i32; 4];

fn main() {
    fn f(_: S) {}

    // These two types have the same size but are still not compatible.
    let g = unsafe { std::mem::transmute::<fn(S), fn(A)>(f) };

    g(Default::default()) //~ ERROR: calling a function with argument of type S passing data of type [i32; 4]
}