What should an IDE for haskell be able to do?

Question

Haskell

What a haskell IDE should be able to do, a list of features built into a haskell IDE

Answer 1

In what context is the question? Everything is as usual, like
1. highlight errors (when saving the file or right at the time of writing the code)
2. show types (derived and / or from the definition of the symbol)
3. show docks (including those written in source codes)
4. launch the interpreter on the project
5. debugger
6. renaming
7. removal of local definition
, etc.

Answer 2

At least parse libs and autocomplete. And I don’t know such for Haskell.