use mtl to generate errors

1 files changed, 3 insertions, 1 deletions

diff --git a/lisk.cabal b/lisk.cabal
index 627815d..bea3414 100644
--- a/lisk.cabal
+++ b/lisk.cabal
@@ -26,7 +26,8 @@ library
   exposed-modules: 
     Parser,
     Evaluator,
-    Operators
+    Operators,
+    Error
 
 executable lisk
   default-language: Haskell2010
@@ -35,6 +36,7 @@ executable lisk
     base >=4.12 && <4.13,
     parsec == 3.*,
     readline >= 1.0,
+    mtl >= 2.1,
     lisk
   hs-source-dirs: bin