Add test case

Author: JukkaL

mypy/test/data/check-inference.test

@@ -1045,6 +1045,15 @@ a()
 [builtins fixtures/list.py]
 [out]
 
+[case testInferListInitializedToEmptyAndMultipleAssignment]
+a, b = [], []
+a.append(1)
+b.append('')
+a() # E: List[int] not callable
+b() # E: List[str] not callable
+[builtins fixtures/list.py]
+[out]
+
 [case testInferListInitializedToEmptyInFunction]
 def f() -> None:
    a = []