================================================================================
handling
================================================================================

_handling error _with _proc() _endproc()
$

_handling error _with _default
$

_handling _default
$

--------------------------------------------------------------------------------

(source_file
  (fragment
    (handling
      condition: (variable)
      (invoke
        receiver: (procedure))))
  (fragment
    (handling
      condition: (variable)))
  (fragment
    (handling)))
