tests/compile-fail/validity/execute_memory.rs

   1 #![feature(box_syntax)]
   2
   3 fn main() {
   4     let x = box 42;
   5     unsafe {
   6         let _f = std::mem::transmute::<Box<i32>, fn()>(x); //~ ERROR encountered a pointer, but expected a function pointer
   7     }
   8 }