Error handling
~~~~~~~~~~~~~~


+ `errcatch`_ error trapping
+ `errclear`_ error clearing
+ `error`_ error message
+ `error_table`_ table of error messages
+ `iserror`_ error occurrence test
+ `lasterror`_ get last recorded error message
+ `warning`_ warning messages


.. _iserror: iserror.html
.. _warning: warning.html
.. _errclear: errclear.html
.. _error_table: error_table.html
.. _errcatch: errcatch.html
.. _lasterror: lasterror.html
.. _error: error.html