copilot-theorem: Remove uses of LambdaCase #736

Description

copilot-theorem uses the LambdaCase language extension. There is a preference for a simpler version of Copilot and minimizing the extensions used.

Since LambdaCase does not really save much code and is not really needed, it should be removed from the codebase.

Type

• Management: Compliance with style guide.

Additional context

None.

Requester

• Ivan Perez.

Method to check presence of bug

While we cannot programmatically check whether LambdaCase is or is not needed, we can check that it is present by running grep on the codebase:

$ grep -nHre 'LambdaCase' --include='*.hs' 
copilot-theorem/src/Copilot/Theorem/TransSys/Operators.hs:3:{-# LANGUAGE LambdaCase                #-}
copilot-theorem/src/Copilot/Theorem/Prover/SMT.hs:3:{-# LANGUAGE LambdaCase        #-}
copilot-theorem/src/Copilot/Theorem/Prover/TPTP.hs:2:{-# LANGUAGE LambdaCase #-}
copilot-theorem/src/Copilot/Theorem/Prover/Z3.hs:4:{-# LANGUAGE LambdaCase            #-}
copilot-theorem/src/Copilot/Theorem/IL/Spec.hs:3:{-# LANGUAGE LambdaCase                #-}
copilot-theorem/src/Copilot/Theorem/IL/Transform.hs:1:{-# LANGUAGE LambdaCase #-}
copilot-theorem/src/Copilot/Theorem/IL/Translate.hs:2:{-# LANGUAGE LambdaCase          #-}
copilot-theorem/src/Copilot/Theorem/What4.hs:5:{-# LANGUAGE LambdaCase          #-}

Note that the module Copilot.Theorem.Prover.Z3 is no longer needed, so its use of LambdaCase can be ignored.

Expected result

No modules in Copilot use LambdaCase.

Desired result

No modules in Copilot use LambdaCase.

Proposed solution

Replace all uses of \case with \<variable> -> case <variable> of across the codebase, where <variable> is a variable name that matches the input to which case selection is being applied.

Remove LambdaCase from the list of extensions used by all files.

Further notes

None.