message: Remove last use of transmute
diff: @@ -60,7 +60,8 @@ impl<'a> UnsafeFromValue for &'a str {
  let slot = value.into_string()?;
  if let Ok(value) = vm.string_ref(slot) {
  - return Ok(std::mem::transmute(value));
  + // Make up a lifetime.
  + return Ok(&*(value as *const _));
  }
  Err(value)
  