Implement 'let'

1 files changed, 2 insertions, 0 deletions

diff --git a/AST.hs b/AST.hs
index eae5af8..df946dd 100644
--- a/AST.hs
+++ b/AST.hs
@@ -14,6 +14,7 @@ data Value
     | VName Name
     | VQuoted Value
     | VLambda [Name] Value
+    | VLet [(Name, Value)] Value
     | VBuiltin String
     | VEllipsis
   deriving (Eq)
@@ -29,6 +30,7 @@ instance Show Value where
     show (VName n) = n
     show (VQuoted e) = '\'' : show e
     show (VLambda as v) = "(lambda (" ++ intercalate " " as ++ ") " ++ show v ++ ")"
+    show (VLet ps v) = "(let (" ++ intercalate " " ["(" ++ n ++ " " ++ show w ++ ")" | (n, w) <- ps] ++ ") " ++ show v ++ ")"
     show (VBuiltin str) = "[[builtin " ++ str ++ "]]"
     show VEllipsis = "..."