diff --git a/src/com/annimon/ownlang/Console.java b/src/com/annimon/ownlang/Console.java
new file mode 100644
index 0000000..06217d6
--- /dev/null
+++ b/src/com/annimon/ownlang/Console.java
@@ -0,0 +1,56 @@
+package com.annimon.ownlang;
+
+import com.annimon.ownlang.lib.CallStack;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.io.UnsupportedEncodingException;
+
+public class Console {
+
+    public static void print(String value) {
+        System.out.print(value);
+    }
+
+    public static void print(Object value) {
+        print(value.toString());
+    }
+
+    public static void println() {
+        System.out.println();
+    }
+
+    public static void println(String value) {
+        System.out.println(value);
+    }
+
+    public static void println(Object value) {
+        println(value.toString());
+    }
+
+    public static void error(Throwable throwable) {
+        error(throwable.toString());
+    }
+
+    public static void error(CharSequence value) {
+        System.err.println(value);
+    }
+    
+    public static void handleException(Thread thread, Throwable throwable) {
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try(final PrintStream ps = new PrintStream(baos)) {
+            ps.printf("%s in %s\n", throwable.getMessage(), thread.getName());
+            for (CallStack.CallInfo call : CallStack.getCalls()) {
+                ps.printf("\tat %s\n", call);
+            }
+            ps.println();
+            throwable.printStackTrace(ps);
+            ps.flush();
+        }
+        try {
+            error(baos.toString("UTF-8"));
+        } catch (UnsupportedEncodingException ex) {
+            error(baos.toString());
+        }
+    }
+}
diff --git a/src/com/annimon/ownlang/Main.java b/src/com/annimon/ownlang/Main.java
index ae1fd81..b24e929 100644
--- a/src/com/annimon/ownlang/Main.java
+++ b/src/com/annimon/ownlang/Main.java
@@ -1,6 +1,5 @@
 package com.annimon.ownlang;
 
-import com.annimon.ownlang.lib.CallStack;
 import com.annimon.ownlang.parser.Lexer;
 import com.annimon.ownlang.parser.Parser;
 import com.annimon.ownlang.parser.SourceLoader;
@@ -90,7 +89,7 @@ public final class Main {
             measurement.start("Execution time");
             program.execute();
         } catch (Exception ex) {
-            handleException(Thread.currentThread(), ex);
+            Console.handleException(Thread.currentThread(), ex);
         } finally {
             if (showMeasurements) {
                 measurement.stop("Execution time");
@@ -99,12 +98,4 @@ public final class Main {
             }
         }
     }
-    
-    public static void handleException(Thread thread, Throwable throwable) {
-        System.err.printf("%s in %s\n", throwable.getMessage(), thread.getName());
-        for (CallStack.CallInfo call : CallStack.getCalls()) {
-            System.err.printf("\tat %s\n", call);
-        }
-        throwable.printStackTrace();
-    }
 }
diff --git a/src/com/annimon/ownlang/lib/CallStack.java b/src/com/annimon/ownlang/lib/CallStack.java
index cad247c..e5b753b 100644
--- a/src/com/annimon/ownlang/lib/CallStack.java
+++ b/src/com/annimon/ownlang/lib/CallStack.java
@@ -7,6 +7,10 @@ public final class CallStack {
     
     private static final Deque<CallInfo> calls = new ConcurrentLinkedDeque<CallInfo>();;
     
+    public static synchronized void clear() {
+        calls.clear();
+    }
+    
     public static synchronized void enter(String name, Function function) {
         calls.push(new CallInfo(name, function));
     }
diff --git a/src/com/annimon/ownlang/lib/Variables.java b/src/com/annimon/ownlang/lib/Variables.java
index e11d3ff..6671cec 100644
--- a/src/com/annimon/ownlang/lib/Variables.java
+++ b/src/com/annimon/ownlang/lib/Variables.java
@@ -16,6 +16,12 @@ public final class Variables {
     static {
         stack = new Stack<>();
         variables = new ConcurrentHashMap<>();
+        Variables.clear();
+    }
+    
+    public static void clear() {
+        stack.clear();
+        variables.clear();
         variables.put("true", NumberValue.ONE);
         variables.put("false", NumberValue.ZERO);
     }
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_echo.java b/src/com/annimon/ownlang/lib/modules/functions/std_echo.java
index 4aa15ba..6ec9eb5 100644
--- a/src/com/annimon/ownlang/lib/modules/functions/std_echo.java
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_echo.java
@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.Console;
 import com.annimon.ownlang.lib.Function;
 import com.annimon.ownlang.lib.NumberValue;
 import com.annimon.ownlang.lib.Value;
@@ -9,10 +10,10 @@ public final class std_echo implements Function {
     @Override
     public Value execute(Value... args) {
         for (Value arg : args) {
-            System.out.print(arg.asString());
-            System.out.print(" ");
+            Console.print(arg.asString());
+            Console.print(" ");
         }
-        System.out.println();
+        Console.println();
         return NumberValue.ZERO;
     }
 }
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_thread.java b/src/com/annimon/ownlang/lib/modules/functions/std_thread.java
index 75a50fe..e789a67 100644
--- a/src/com/annimon/ownlang/lib/modules/functions/std_thread.java
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_thread.java
@@ -1,6 +1,6 @@
 package com.annimon.ownlang.lib.modules.functions;
 
-import com.annimon.ownlang.Main;
+import com.annimon.ownlang.Console;
 import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.*;
 
@@ -26,7 +26,7 @@ public final class std_thread implements Function {
         }
         
         final Thread thread = new Thread(() -> body.execute(params));
-        thread.setUncaughtExceptionHandler(Main::handleException);
+        thread.setUncaughtExceptionHandler(Console::handleException);
         thread.start();
         return NumberValue.ZERO;
     }
diff --git a/src/com/annimon/ownlang/parser/Parser.java b/src/com/annimon/ownlang/parser/Parser.java
index 5bc70f3..f0d0627 100644
--- a/src/com/annimon/ownlang/parser/Parser.java
+++ b/src/com/annimon/ownlang/parser/Parser.java
@@ -48,6 +48,7 @@ public final class Parser {
     private final List<Token> tokens;
     private final int size;
     private final ParseErrors parseErrors;
+    private Statement parsedStatement;
     
     private int pos;
 
@@ -57,6 +58,10 @@ public final class Parser {
         parseErrors = new ParseErrors();
     }
     
+    public Statement getParsedStatement() {
+        return parsedStatement;
+    }
+    
     public ParseErrors getParseErrors() {
         return parseErrors;
     }
@@ -72,6 +77,7 @@ public final class Parser {
                 recover();
             }
         }
+        parsedStatement = result;
         return result;
     }
     
diff --git a/src/com/annimon/ownlang/parser/ast/PrintStatement.java b/src/com/annimon/ownlang/parser/ast/PrintStatement.java
index e008879..8b175d6 100644
--- a/src/com/annimon/ownlang/parser/ast/PrintStatement.java
+++ b/src/com/annimon/ownlang/parser/ast/PrintStatement.java
@@ -1,5 +1,7 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.Console;
+
 /**
  *
  * @author aNNiMON
@@ -14,7 +16,7 @@ public final class PrintStatement implements Statement {
 
     @Override
     public void execute() {
-        System.out.print(expression.eval());
+        Console.print(expression.eval());
     }
     
     @Override
diff --git a/src/com/annimon/ownlang/parser/ast/PrintlnStatement.java b/src/com/annimon/ownlang/parser/ast/PrintlnStatement.java
index ced55fd..6f7823e 100644
--- a/src/com/annimon/ownlang/parser/ast/PrintlnStatement.java
+++ b/src/com/annimon/ownlang/parser/ast/PrintlnStatement.java
@@ -1,5 +1,7 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.Console;
+
 /**
  *
  * @author aNNiMON
@@ -14,7 +16,7 @@ public final class PrintlnStatement implements Statement {
 
     @Override
     public void execute() {
-        System.out.println(expression.eval());
+        Console.println(expression.eval());
     }
     
     @Override
diff --git a/src/com/annimon/ownlang/parser/visitors/VariablePrinter.java b/src/com/annimon/ownlang/parser/visitors/VariablePrinter.java
index 82a6052..4f29f3a 100644
--- a/src/com/annimon/ownlang/parser/visitors/VariablePrinter.java
+++ b/src/com/annimon/ownlang/parser/visitors/VariablePrinter.java
@@ -1,5 +1,6 @@
 package com.annimon.ownlang.parser.visitors;
 
+import com.annimon.ownlang.Console;
 import com.annimon.ownlang.parser.ast.*;
 
 /**
@@ -11,18 +12,18 @@ public final class VariablePrinter extends AbstractVisitor {
     @Override
     public void visit(AssignmentExpression s) {
         super.visit(s);
-        System.out.println(s.target);
+        Console.println(s.target);
     }
     
     @Override
     public void visit(ContainerAccessExpression s) {
         super.visit(s);
-        System.out.println(s.variable);
+        Console.println(s.variable);
     }
 
     @Override
     public void visit(VariableExpression s) {
         super.visit(s);
-        System.out.println(s.name);
+        Console.println(s.name);
     }
 }