diff --git a/calculator.cabal b/calculator.cabal
--- a/calculator.cabal
+++ b/calculator.cabal
@@ -1,5 +1,5 @@
 name:                calculator
-version:             0.3.0.0
+version:             0.3.0.1
 synopsis:            A calculator repl.
 description:         A calculator repl that processes mathematical expressions.
                      Does basic arithmetic, and provides pre-defined basic mathematical functions.
@@ -40,6 +40,7 @@
                      , Calculator.Prim.Expr
                      , Calculator.Prim.Function
                      , Calculator.Prim.Statement
+                     , Calculator.Prim.Result
                      , Calculator.Color
   -- other-extensions:    
   build-depends:       base >=4.7 && <4.8
@@ -74,6 +75,8 @@
                      , Calculator.Prim.Expr
                      , Calculator.Prim.Function
                      , Calculator.Prim.Statement
+                     , Calculator.Prim.Result
+                     , Calculator.Color
                      , Model.Arithmetic
   hs-source-dirs:      tests/ src/
   build-depends:       QuickCheck >= 2.7.6 && <2.7.7
diff --git a/src/Calculator/Prim/Result.hs b/src/Calculator/Prim/Result.hs
new file mode 100644
--- /dev/null
+++ b/src/Calculator/Prim/Result.hs
@@ -0,0 +1,21 @@
+{-# LANGUAGE CPP #-}
+
+module Calculator.Prim.Result
+    ( Result (..)
+    ) where
+
+--------------------------------------------------------------------------------
+
+import           Calculator.Prim.Bindings (Bindings)
+
+--------------------------------------------------------------------------------
+
+data Result = NewBindings Bindings
+            | Text String
+            | Error String
+            | Value Double
+#ifdef PLOT
+            | Action (IO ())
+#endif
+
+--------------------------------------------------------------------------------