-exc_types = ['alignment', 'instr_fault', 'invalid', 'badtree',
- 'perm_error', 'rc_error', 'segment_fault',
- 'happened', ] # must be last: may overlap with Data.ok
+exc_types = ['alignment',
+ 'instr_fault', # this one is not an actual exception
+ # but information *about* the type of
+ # exception that must be generated
+ 'invalid',
+ 'badtree',
+ 'perm_error',
+ 'rc_error',
+ 'segment_fault',
+ 'happened', # must be last: may overlap with Data.ok
+ ]
+