failwith

Feedback.failwith : string -> 'a

Raise a HOL_ERR.

The function failwith raises a HOL_ERR with default values. This is useful when detailed error tracking is not necessary.

failwith differs from fail in that it takes an extra string argument, which is typically used to tell which function failwith is being called from.

Failure

Always fails.

Example

> failwith "foo" handle e => Raise e;
Exception- The type of (it) contains a free type variable. Setting it to a unique
   monotype.
HOL_ERR (at ??.failwith: foo) raised

See also

Feedback, Feedback.fail, Feedback.Raise, Feedback.HOL_ERR