Fix pre-3.8 AST, self-ignore annotation, pytest-slow test case

- Only fetch python AST's end column and line when available
- Move type-ignore to the line with an argument
- Update python-slow test case to use location of argument

mypy/fastparse.py

@@ -1082,7 +1082,12 @@ def make_argument(
             pos_only = True
 
         argument = Argument(Var(arg.arg), arg_type, self.visit(default), kind, pos_only)
-        argument.set_line(arg.lineno, arg.col_offset, arg.end_lineno, arg.end_col_offset)
+        argument.set_line(
+            arg.lineno,
+            arg.col_offset,
+            getattr(arg, "end_lineno", None),
+            getattr(arg, "end_col_offset", None),
+        )
         return argument
 
     def fail_arg(self, msg: str, arg: ast3.arg) -> None:

mypy/test/data.py

@@ -677,8 +677,8 @@ class DataFileCollector(pytest.Collector):
     parent: DataSuiteCollector
 
     @classmethod  # We have to fight with pytest here:
-    def from_parent(  # type: ignore[override]
-        cls, parent: DataSuiteCollector, *, name: str
+    def from_parent(
+        cls, parent: DataSuiteCollector, *, name: str  # type: ignore[override]
     ) -> DataFileCollector:
         collector = super().from_parent(parent, name=name)
         assert isinstance(collector, DataFileCollector)

test-data/unit/daemon.test

@@ -490,7 +490,7 @@ bar/baz.py:4:5:attr
 $ dmypy inspect foo.py:10:10 --show definition --include-span
 10:1:10:12 -> bar/baz.py:6:1:test
 $ dmypy inspect foo.py:14:6 --show definition --include-span --include-kind
-NameExpr:14:5:14:7 -> foo.py:13:1:arg
+NameExpr:14:5:14:7 -> foo.py:13:9:arg
 MemberExpr:14:5:14:9 -> bar/baz.py:9:5:x, bar/baz.py:11:5:x
 
 [file foo.py]