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Raise custom error when builtin symbol is missing #2062

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Merged
merged 1 commit into from
Aug 28, 2016
Merged

Raise custom error when builtin symbol is missing #2062

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11 changes: 10 additions & 1 deletion mypy/checker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2236,7 +2236,16 @@ def lookup_qualified(self, name: str) -> SymbolTableNode:
n = self.modules[parts[0]]
for i in range(1, len(parts) - 1):
n = cast(MypyFile, n.names.get(parts[i], None).node)
return n.names[parts[-1]]
last = parts[-1]
if last in n.names:
return n.names[last]
elif len(parts) == 2 and parts[0] == 'builtins':
raise KeyError("Could not find builtin symbol '{}'. (Are you running a "
"test case? If so, make sure to include a fixture that "
"defines this symbol.)".format(last))
else:
msg = "Failed qualified lookup: '{}' (fullname = '{}')."
raise KeyError(msg.format(last, name))

def enter_partial_types(self) -> None:
"""Push a new scope for collecting partial types."""
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