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Support all top-level declarations in GHCi

I thought we had a ticket for this, but I can't find it so I'm creating one.

In GHCi there's no reason in principle that we can't allow any declaration that you can write at the top-level of a source file, at the interactive prompt. Many people have asked for this over the years.

  • data/type/newtype declarations
  • class declarations
  • instance declarations
  • foreign declarations (exception foreign export)
  • deriving
  • default???
Trac metadata
Trac field Value
Version 7.0.1
Type Task
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component GHCi
Test case
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