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Fix #476 improve error message #477

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Apr 29, 2024
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2 changes: 2 additions & 0 deletions pykern/fconf.py
Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,8 @@ def __init__(self, files, base_vars=None):
except Exception as e:
pykern.pkinspect.append_exception_reason(e, f"fconf.Parser.file={f}")
raise
if "yml" not in self.files:
raise ValueError("must supply at least on '.yml' file")
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e = _Evaluator(
global_fvars=PKDict() if base_vars is None else copy.deepcopy(base_vars),
parser=self,
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