rust/tests/compile-fail/cast_fn_ptr2.rs

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fn main() {
fn f(_ : (i32,i32)) {}
let g = unsafe {
std::mem::transmute::<fn((i32,i32)), fn(i32)>(f)
};
g(42) //~ ERROR tried to call a function with sig fn((i32, i32)) through a function pointer of type fn(i32)
}