Report an error.
A simple type class for success/failure computations.
Failure Monad Transformer
This exception is thrown by the assert operation when the condition fails. The String argument contains the location of the assertion in the source program.
indicates program failure with an exit code. The exact interpretation of the code is operating-system dependent. In particular, some values may be prohibited (e.g. 0 on a POSIX-compliant system).
A pattern matching failure. The String argument should contain a descriptive message including the function name, source file and line number.
A pattern match failed. The String gives information about the source location of the pattern.
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