This RuntimeException is thrown if SnuggleTeX has detected something amiss with its logic. This must NOT be used to indicate an error in client-supplied input.

This is unchecked, since it is not expected to occur in normal circumstances and users of SnuggleTeX can't really do anything useful to alleviate the underlying problem!

SnuggleTeX Developer Note

Throw this Exception when SnuggleTeX's code does silly things. (E.g. unexpected switch case, impossible state.) Raise an error using SnuggleSession#registerError(InputError) if the error is down to bad client input.

Any occurrences of this error "in the wild" indicate a bug with SnuggleTeX that needs to be diagnosed and fixed!