compiler/rustc_span/src/fatal_error.rs

   1 /// Used as a return value to signify a fatal error occurred. (It is also
   2 /// used as the argument to panic at the moment, but that will eventually
   3 /// not be true.)
   4 #[derive(Copy, Clone, Debug)]
   5 #[must_use]
   6 pub struct FatalError;
   7
   8 pub struct FatalErrorMarker;
   9
  10 // Don't implement Send on FatalError. This makes it impossible to panic!(FatalError).
  11 // We don't want to invoke the panic handler and print a backtrace for fatal errors.
  12 impl !Send for FatalError {}
  13
  14 impl FatalError {
  15     pub fn raise(self) -> ! {
  16         std::panic::resume_unwind(Box::new(FatalErrorMarker))
  17     }
  18 }
  19
  20 impl std::fmt::Display for FatalError {
  21     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
  22         write!(f, "parser fatal error")
  23     }
  24 }
  25
  26 impl std::error::Error for FatalError {}