This is not documented and the error messages is not very helpful:
Traceback (most recent call last):
File "/venv/lib/python3.10/site-packages/fez/__init__.py", line 414, in parseString
rv = self.expand_statements(rv)
File "/venv/lib/python3.10/site-packages/fez/__init__.py", line 433, in expand_statements
returned = callback()
File "/venv/lib/python3.10/site-packages/fez/__init__.py", line 487, in <lambda>
verb_ret = (verb, [transformer._THUNK, lambda: transformer.action(ret)])
File "/venv/lib/python3.10/site-packages/fez/Feature.py", line 65, in action
statements = self.parser.expand_statements(statements)
File "/venv/lib/python3.10/site-packages/fez/__init__.py", line 433, in expand_statements
returned = callback()
File "/venv/lib/python3.10/site-packages/fez/__init__.py", line 496, in <lambda>
verb_ret = (verb, [transformer._THUNK, lambda : transformer.transform(tree) ])
File "/venv/lib/python3.10/site-packages/lark/visitors.py", line 153, in transform
return self._transform_tree(tree)
File "/venv/lib/python3.10/site-packages/lark/visitors.py", line 149, in _transform_tree
return self._call_userfunc(tree, children)
File "/venv/lib/python3.10/site-packages/lark/visitors.py", line 120, in _call_userfunc
raise VisitError(tree.data, tree, e)
lark.exceptions.VisitError: Error trying to process rule "action":
'hah-ar.medi'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/venv/bin/fez2fea", line 42, in <module>
p.parseFile(args.fee)
File "/venv/lib/python3.10/site-packages/fez/__init__.py", line 403, in parseFile
return self.parseString(data)
File "/venv/lib/python3.10/site-packages/fez/__init__.py", line 416, in parseString
raise e.orig_exc
File "/venv/lib/python3.10/site-packages/lark/visitors.py", line 116, in _call_userfunc
return f(children)
File "/venv/lib/python3.10/site-packages/fez/BariYe.py", line 395, in action
entry_anchor = parser.fontfeatures.anchors[yb]["entry"]
KeyError: 'hah-ar.medi'
This is not documented and the error messages is not very helpful: