warn-unused-ignores errors don't have a column number

[DetachHead]

1 # type:ignore[misc]
foo: int = ""

main.py:1: error: Unused "type: ignore" comment
main.py:2:12: error: Incompatible types in assignment (expression has type "str", variable has type "int")  [assignment]

playground

this is causing the new vscode mypy extension to not display unused ignore errors, see microsoft/vscode-mypy#35 (comment)

apparently that's not the only error that doesn't have column numbers, but i'm not sure what other ones there are

[karthiknadig]

It also doesn't include an error code.