Err package:ihaskell
Whether or not an error occurred.
error stops execution and displays an error message.
A variant of
error that does not produce a stack trace.
An error indicating that parsing the code block failed.
An error reply to an execute request
Used for compiler-generated error message; encoding saves bytes of
string junk.
Computes the modular inverse.
I.e. y = integerRecipMod# x m = x^(-1) mod m
with 0 < y < |m|