Couple of error messages have been fixed

src/main/java/serene/simple/BaseScope.java

@@ -23,7 +23,7 @@ public abstract class BaseScope {
       return this.parent.lookupSymbol(symbolName);
     }
     else {
-      throw new RuntimeException(String.format("Variable '%s' is not defined in this scope.",
+      throw new RuntimeException(String.format("Symbol '%s' is not defined in this scope.",
                                                symbolName));
     }
   }

src/main/java/serene/simple/Main.java

@@ -1,16 +1,21 @@
 package serene.simple;
 
 import java.io.IOException;
-import java.io.InputStreamReader;
-import java.util.Scanner;
-import java.io.BufferedReader;
 import java.io.ByteArrayInputStream;
 import java.io.Console;
 import java.io.FileInputStream;
 
 
 public class Main {
-  public static void main(String[] args) throws IOException {
+
+  private static void isJava8() throws RuntimeException {
+    if (System.getProperty("java.vm.specification.version").equals("1.8"))
+      throw new RuntimeException("Minimume required version of JDK is 1.8");
+  }
+
+  public static void main(String[] args) throws IOException, RuntimeException {
+    Main.isJava8();
+
     if (args.length == 0) {
       startRepl();
       return;

src/main/java/serene/simple/RootScope.java

@@ -4,7 +4,7 @@ import java.util.HashMap;
 import serene.simple.builtin.PrintlnFn;
 import serene.simple.builtin.QuitFn;
 import serene.simple.builtin.PlusFn;
-
+import serene.simple.builtin.NewFn;
 
 public class RootScope extends BaseScope {
   private final BaseScope parent;
@@ -15,6 +15,7 @@ public class RootScope extends BaseScope {
       put("System", System.class);
       put("Boolean", Boolean.class);
       put("String", String.class);
+      put("new", new NewFn());
     }};
     // "+", PlusFn,
     // "-", MinusFn,
@@ -36,7 +37,7 @@ public class RootScope extends BaseScope {
       return this.symbolsMapping.get(symbolName);
     }
     else {
-      throw new RuntimeException(String.format("Variable '%s' is not defined in this scope.",
+      throw new RuntimeException(String.format("Symbol '%s' is not defined in this scope.",
                                                symbolName));
     }
   }