Imprecise source spans for erroneous flags in OPTIONS_GHC
If I say
{-# OPTIONS_GHC -this-doesnt-exist -neither-does-this #-}
module Bug where
I get
Bug.hs:1:16: error:
unknown flag in {-# OPTIONS_GHC #-} pragma: -this-doesnt-exist
|
1 | {-# OPTIONS_GHC -this-doesnt-exist -neither-does-this #-}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Bug.hs:1:16: error:
unknown flag in {-# OPTIONS_GHC #-} pragma: -neither-does-this
|
1 | {-# OPTIONS_GHC -this-doesnt-exist -neither-does-this #-}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Note that both errors have the same location and both caret-diagnostics show the whole list of flags.
Getting this wrong means that the errors get ordered unpredictably.