Fixes and warnings.

Author: PapyChacal

src/main/scala/uk/ac/ed/dal/structtensor/Main.scala

@@ -10,7 +10,8 @@ import codegen._
 import java.io.File
 import scopt.OParser
 
-object Main extends App {
+object Main {
+  def main(args: Array[String]) = {
   import Optimizer._
   import Utils._
 
@@ -331,3 +332,4 @@ object Main extends App {
     }
   }
 }
+}

src/main/scala/uk/ac/ed/dal/structtensor/codegen/Codegen.scala

@@ -25,7 +25,6 @@ object Codegen {
           case c: ConstantDouble => c.value.toString
           case a @ Arithmetic(op, i1, i2) =>
             s"(${CPPFormat(i1)} ${op} ${CPPFormat(i2)})"
-          case _ => ""
         }
       case a: Access =>
         if (a.vars.isEmpty) CPPFormat(a.name)
@@ -81,7 +80,6 @@ object Codegen {
           }
           case _ => None
         }
-      case _ => None
     }
     val (begin, end, equals, usedIndices) = (
       begin_end_equals_usedIndices.map(_._1),