source range for type error sometimes includes comment

foo = head
    $ not -- bar
    $ ()  -- baz

produces these error messages (only showing their source range annotations here)

2 |     $ not -- bar
  |       ^^^^^^^^^^...

3 |     $ ()  -- baz
  |       ^^

For line 2, the source range includes the comment, which I find strange; while for line 3, it does not.

I checked with some earlier GHC versions, and I think this appeared with 8.2 (when source ranges were introduced?) and it's the same up to 9.0.1.