fix type checking

msullivan · msullivan · commit 340834de47c6 · 2019-05-16T00:00:48.000-07:00
diff --git a/mypy/config_parser.py b/mypy/config_parser.py
@@ -227,7 +227,7 @@ def parse_section(prefix: str, template: Options,
 def split_directive(s: str) -> List[str]:
     """Split s on commas, except during quoted sections"""
     parts = []
-    cur = []
+    cur = []  # type: List[str]
     i = 0
     while i < len(s):
         if s[i] == ',':
