use std::mem; struct A { x: i32, y: f64 } #[cfg(not(FALSE))] unsafe fn access(n:*mut A) -> (i32, f64) { let x : i32 = n.x; //~ no field `x` on type `*mut A` let y : f64 = n.y; //~ no field `y` on type `*mut A` (x, y) } #[cfg(FALSE)] unsafe fn access(n:*mut A) -> (i32, f64) { let x : i32 = (*n).x; let y : f64 = (*n).y; (x, y) } fn main() { let a : A = A { x: 3, y: 3.14 }; let p : &A = &a; let (x,y) = unsafe { let n : *mut A = mem::transmute(p); access(n) }; println!("x: {}, y: {}", x, y); }