| exception Invalid of exn * Printexc.raw_backtrace | |
| exception Trap | |
| exception Throw | |
| exception OutOfMemory | |
| exception Timeout | |
| exception MissingReturnValue of string | |
| exception ArgMismatch of string | |
| exception UnknownFunc of string | |
| exception FreeVar of string | |
| exception WrongConversion of string | |
| exception Fail | |
| (* For AL-level debugging *) | |
| exception Error of Util.Source.region * string * string |