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Define a metavariable type.

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Rob Rix 2017-09-09 15:52:33 +01:00
parent 825990cfce
commit 4c2ce050de
1 changed files with 3 additions and 0 deletions
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src/Diff.hs
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@ -20,6 +20,9 @@ import Text.Show
-- | An annotated series of patches of terms.
newtype Diff syntax ann = Diff { unDiff :: DiffF syntax ann (Diff syntax ann) }
newtype MetaVar = MetaVar { unMetaVar :: String }
deriving (Eq, Ord, Show)
data DiffF syntax ann recur
= Copy (Both ann) (syntax recur)
| Patch (Patch (Term syntax ann))