Some minor changes

lib/lang.ml

@@ -1,3 +1,5 @@
 module Exercises = Exercises
 
 module MiniImp = MiniImp
+
+module MiniFun = MiniFun

lib/miniImp.ml

@@ -42,6 +42,7 @@ type memory = {
 
 exception AbsentAssignment of string
 exception DivisionByZero of string
+
 module Utility = Utility;;
 
 Random.self_init ()

test/dune

@@ -1,2 +1,3 @@
 (test
- (name test_lang))
+ (name testingImp)
+ (libraries lang))