compiler/rustc_error_codes/src/error_codes/E0512.md

   1 Transmute with two differently sized types was attempted.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0512
   6 fn takes_u8(_: u8) {}
   7
   8 fn main() {
   9     unsafe { takes_u8(::std::mem::transmute(0u16)); }
  10     // error: cannot transmute between types of different sizes,
  11     //        or dependently-sized types
  12 }
  13 ```
  14
  15 Please use types with same size or use the expected type directly. Example:
  16
  17 ```
  18 fn takes_u8(_: u8) {}
  19
  20 fn main() {
  21     unsafe { takes_u8(::std::mem::transmute(0i8)); } // ok!
  22     // or:
  23     unsafe { takes_u8(0u8); } // ok!
  24 }
  25 ```