[#1378] instance Interpret ()

[jiegillet]

As discussed in #1378. So much work :)

[sjakobi]

Perfect! :)

[sjakobi]

Ah, this seems to cause a build failure in the tasty testsuite:

C:\projects\dhall-haskell\dhall\tests\Dhall\Test\Dhall.hs:170:36: error:
    • Overlapping instances for Interpret ()
        arising from the 'deriving' clause of a data type declaration
      Matching instances:
        instance Interpret () -- Defined in ‘Dhall’
        instance Interpret () -- Defined at tests\Dhall\Test\Dhall.hs:175:1
    • When deriving the instance for (Interpret Records)
    |
170 |     deriving (Eq, Generic, Inject, Interpret, Show)
    |                                    ^^^^^^^^^

Can you remove the instance in the testsuite, @jiegillet?

[Gabriella439]

@jiegillet: It looks like the test suite had an orphan Interpret instance for () (because this feature hadn't been implemented!):

dhall-haskell/dhall/tests/Dhall/Test/Dhall.hs

Line 175 in 6a8e7e1

deriving instance Interpret ()

If you remove that then CI should passs