Don't suggest import an unnecessary data constructor. #1984
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Usually, when the type constructor is used but the data constructor isn't, we
only suggest importing the type constructor. When the data constructor and type
constructor share the same name we get mixed up and suggest importing both.
The solution is to do a better job filtering out the data cons when we know we
are looking for a type con.
Closes #1932 .