try using types with lower alignment, maybe that helps for Windows

Author: RalfJung

tests/compile-fail/transmute_fat.rs

@@ -4,12 +4,12 @@
 fn main() {
     #[cfg(target_pointer_width="64")]
     let bad = unsafe {
-        std::mem::transmute::<&[u8], u128>(&[1u8])
+        std::mem::transmute::<&[u8], [u8; 16]>(&[1u8])
     };
     #[cfg(target_pointer_width="32")]
     let bad = unsafe {
-        std::mem::transmute::<&[u8], u64>(&[1u8])
+        std::mem::transmute::<&[u8], [u8; 8]>(&[1u8])
     };
-    let _ = bad + 1; //~ ERROR constant evaluation error
+    let _ = bad[0] + bad[bad.len()-1]; //~ ERROR constant evaluation error
     //~^ NOTE a raw memory access tried to access part of a pointer value as raw bytes
 }