diff --git a/src/me/topchetoeu/jscript/compilation/FunctionBody.java b/src/me/topchetoeu/jscript/compilation/FunctionBody.java
index 718eeec..7f78066 100644
--- a/src/me/topchetoeu/jscript/compilation/FunctionBody.java
+++ b/src/me/topchetoeu/jscript/compilation/FunctionBody.java
@@ -3,13 +3,25 @@ package me.topchetoeu.jscript.compilation;
 public class FunctionBody {
     public final Instruction[] instructions;
     public final String[] captureNames, localNames;
+    public final int localsN, argsN;
 
-    public FunctionBody(Instruction[] instructions, String[] captureNames, String[] localNames) {
+    public FunctionBody(int localsN, int argsN, Instruction[] instructions, String[] captureNames, String[] localNames) {
+        this.argsN = argsN;
+        this.localsN = localsN;
         this.instructions = instructions;
         this.captureNames = captureNames;
         this.localNames = localNames;
     }
-    public FunctionBody(Instruction[] instructions) {
+    public FunctionBody(int localsN, int argsN, Instruction[] instructions) {
+        this.argsN = argsN;
+        this.localsN = localsN;
+        this.instructions = instructions;
+        this.captureNames = new String[0];
+        this.localNames = new String[0];
+    }
+    public FunctionBody(Instruction... instructions) {
+        this.argsN = 0;
+        this.localsN = 2;
         this.instructions = instructions;
         this.captureNames = new String[0];
         this.localNames = new String[0];
diff --git a/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java b/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java
index 52c292a..e5f56c8 100644
--- a/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java
@@ -14,17 +14,18 @@ import me.topchetoeu.jscript.exceptions.SyntaxException;
 
 public class FunctionStatement extends Statement {
     public final CompoundStatement body;
-    public final String name;
+    public final String varName;
     public final String[] args;
+    public final boolean statement;
 
     private static Random rand = new Random();
 
     @Override
-    public boolean pure() { return name == null; }
+    public boolean pure() { return varName == null; }
 
     @Override
     public void declare(ScopeRecord scope) {
-        if (name != null) scope.define(name);
+        if (varName != null) scope.define(varName);
     }
 
     public static void checkBreakAndCont(CompileTarget target, int start) {
@@ -40,73 +41,83 @@ public class FunctionStatement extends Statement {
         }
     }
 
-    public void compile(CompileTarget target, ScopeRecord scope, String name, boolean isStatement) {
+    protected long compileBody(CompileTarget target, ScopeRecord scope, boolean polute) {
         for (var i = 0; i < args.length; i++) {
             for (var j = 0; j < i; j++) {
-                if (args[i].equals(args[j])){
-                    target.add(Instruction.throwSyntax(new SyntaxException(loc(), "Duplicate parameter '" + args[i] + "'.")));
-                    return;
+                if (args[i].equals(args[j])) {
+                    throw new SyntaxException(loc(), "Duplicate parameter '" + args[i] + "'.");
                 }
             }
         }
-        var subscope = scope.child();
 
-        int start = target.size();
-        var funcTarget = new CompileTarget(target.functions, target.breakpoints);
+        var id = rand.nextLong();
+        var subscope = scope.child();
+        var subtarget = new CompileTarget(target.functions, target.breakpoints);
 
         subscope.define("this");
         var argsVar = subscope.define("arguments");
 
         if (args.length > 0) {
             for (var i = 0; i < args.length; i++) {
-                funcTarget.add(Instruction.loadVar(argsVar).locate(loc()));
-                funcTarget.add(Instruction.loadMember(i).locate(loc()));
-                funcTarget.add(Instruction.storeVar(subscope.define(args[i])).locate(loc()));
+                subtarget.add(Instruction.loadVar(loc(), argsVar));
+                subtarget.add(Instruction.loadMember(loc(), i));
+                subtarget.add(Instruction.storeVar(loc(), subscope.define(args[i])));
             }
         }
 
-        if (!isStatement && this.name != null) {
-            funcTarget.add(Instruction.storeSelfFunc((int)subscope.define(this.name)));
+        if (!statement && this.varName != null) {
+            subtarget.add(Instruction.storeSelfFunc(loc(), (int)subscope.define(this.varName)));
         }
 
         body.declare(subscope);
-        body.compile(funcTarget, subscope, false);
-        funcTarget.add(Instruction.ret().locate(loc()));
-        checkBreakAndCont(funcTarget, start);
+        body.compile(subtarget, subscope, false);
+        subtarget.add(Instruction.ret(subtarget.lastLoc(loc())));
+        checkBreakAndCont(subtarget, 0);
 
-        var id = rand.nextLong();
+        if (polute) target.add(Instruction.loadFunc(loc(), id, subscope.getCaptures()));
+        target.functions.put(id, new FunctionBody(subscope.localsCount(), args.length, subtarget.array(), subscope.captures(), subscope.locals()));
 
-        target.add(Instruction.loadFunc(id, subscope.localsCount(), args.length, subscope.getCaptures()).locate(loc()));
-        target.functions.put(id, new FunctionBody(funcTarget.array(), subscope.captures(), subscope.locals()));
-
-        if (name == null) name = this.name;
-
-        if (name != null) {
-            target.add(Instruction.dup().locate(loc()));
-            target.add(Instruction.loadValue("name").locate(loc()));
-            target.add(Instruction.loadValue(name).locate(loc()));
-            target.add(Instruction.storeMember().locate(loc()));
-        }
-
-        if (this.name != null && isStatement) {
-            var key = scope.getKey(this.name);
-
-            if (key instanceof String) target.add(Instruction.makeVar((String)key).locate(loc()));
-            target.add(Instruction.storeVar(scope.getKey(this.name), false).locate(loc()));
-        }
-
-    }
-    @Override
-    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
-        compile(target, scope, null, false);
-        if (!pollute) target.add(Instruction.discard().locate(loc()));
+        return id;
     }
 
-    public FunctionStatement(Location loc, String name, String[] args, CompoundStatement body) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute, String name) {
+        if (this.varName != null) name = this.varName;
+
+        var hasVar = this.varName != null && statement;
+        var hasName = name != null;
+
+        compileBody(target, scope, pollute || hasVar || hasName);
+
+        if (hasName) {
+            if (pollute || hasVar) target.add(Instruction.dup(loc()));
+            target.add(Instruction.loadValue(loc(), "name"));
+            target.add(Instruction.loadValue(loc(), name));
+            target.add(Instruction.storeMember(loc()));
+        }
+
+        if (hasVar) {
+            var key = scope.getKey(this.varName);
+
+            if (key instanceof String) target.add(Instruction.makeVar(loc(), (String)key));
+            target.add(Instruction.storeVar(loc(), scope.getKey(this.varName), false));
+        }
+    }
+    @Override public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        compile(target, scope, pollute, null);
+    }
+
+    public FunctionStatement(Location loc, String varName, String[] args, boolean statement, CompoundStatement body) {
         super(loc);
-        this.name = name;
+
+        this.varName = varName;
+        this.statement = statement;
 
         this.args = args;
         this.body = body;
     }
+
+    public static void compileWithName(Statement stm, CompileTarget target, ScopeRecord scope, boolean pollute, String name) {
+        if (stm instanceof FunctionStatement) ((FunctionStatement)stm).compile(target, scope, pollute, name);
+        else stm.compile(target, scope, pollute);
+    }
 }
diff --git a/src/me/topchetoeu/jscript/engine/frame/Runners.java b/src/me/topchetoeu/jscript/engine/frame/Runners.java
index fc76a4e..be1e5d5 100644
--- a/src/me/topchetoeu/jscript/engine/frame/Runners.java
+++ b/src/me/topchetoeu/jscript/engine/frame/Runners.java
@@ -179,16 +179,13 @@ public class Runners {
     }
     public static Object execLoadFunc(Context ctx, Instruction instr, CodeFrame frame) {
         long id = (Long)instr.get(0);
-        int localsN = (Integer)instr.get(1);
-        int len = (Integer)instr.get(2);
-        var captures = new ValueVariable[instr.params.length - 3];
+        var captures = new ValueVariable[instr.params.length - 1];
 
-        for (var i = 3; i < instr.params.length; i++) {
-            captures[i - 3] = frame.scope.get(instr.get(i));
+        for (var i = 1; i < instr.params.length; i++) {
+            captures[i - 1] = frame.scope.get(instr.get(i));
         }
 
-        var body = Engine.functions.get(id);
-        var func = new CodeFunction(ctx.environment(), "", localsN, len, captures, body);
+        var func = new CodeFunction(ctx.environment(), "", Engine.functions.get(id), captures);
 
         frame.push(ctx, func);
 
@@ -306,7 +303,6 @@ public class Runners {
         var val = frame.pop();
 
         if (!Values.deleteMember(ctx, val, key)) throw EngineException.ofSyntax("Can't delete member '" + key + "'.");
-        frame.push(ctx, true);
         frame.codePtr++;
         return NO_RETURN;
     }
diff --git a/src/me/topchetoeu/jscript/engine/values/CodeFunction.java b/src/me/topchetoeu/jscript/engine/values/CodeFunction.java
index adc14d4..313dbc3 100644
--- a/src/me/topchetoeu/jscript/engine/values/CodeFunction.java
+++ b/src/me/topchetoeu/jscript/engine/values/CodeFunction.java
@@ -11,7 +11,6 @@ import me.topchetoeu.jscript.engine.scope.ValueVariable;
 
 public class CodeFunction extends FunctionValue {
     public final int localsN;
-    public final int length;
     public final Instruction[] body;
     public final String[] captureNames, localNames;
     public final ValueVariable[] captures;
@@ -46,14 +45,13 @@ public class CodeFunction extends FunctionValue {
         }
     }
 
-    public CodeFunction(Environment environment, String name, int localsN, int length, ValueVariable[] captures, FunctionBody body) {
-        super(name, length);
+    public CodeFunction(Environment environment, String name, FunctionBody body, ValueVariable... captures) {
+        super(name, body.argsN);
         this.captures = captures;
         this.captureNames = body.captureNames;
         this.localNames = body.localNames;
         this.environment = environment;
-        this.localsN = localsN;
-        this.length = length;
+        this.localsN = body.localsN;
         this.body = body.instructions;
     }
 }
diff --git a/src/me/topchetoeu/jscript/parsing/Parsing.java b/src/me/topchetoeu/jscript/parsing/Parsing.java
index 95e030f..67c3d9a 100644
--- a/src/me/topchetoeu/jscript/parsing/Parsing.java
+++ b/src/me/topchetoeu/jscript/parsing/Parsing.java
@@ -808,7 +808,7 @@ public class Parsing {
 
         return ParseRes.res(new ObjProp(
             name, access,
-            new FunctionStatement(loc, access + " " + name.toString(), argsRes.result.toArray(String[]::new), res.result)
+            new FunctionStatement(loc, access + " " + name.toString(), argsRes.result.toArray(String[]::new), false, res.result)
         ), n);
     }
     public static ParseRes<ObjectStatement> parseObject(Filename filename, List<Token> tokens, int i) {
@@ -966,7 +966,7 @@ public class Parsing {
         var res = parseCompound(filename, tokens, i + n);
         n += res.n;
 
-        if (res.isSuccess()) return ParseRes.res(new FunctionStatement(loc, name, args.toArray(String[]::new), res.result), n);
+        if (res.isSuccess()) return ParseRes.res(new FunctionStatement(loc, name, args.toArray(String[]::new), statement, res.result), n);
         else return ParseRes.error(loc, "Expected a compound statement for function.", res);
     }
 
@@ -1891,19 +1891,19 @@ public class Parsing {
         }
         catch (SyntaxException e) {
             res.target.clear();
-            res.add(Instruction.throwSyntax(e));
+            res.add(Instruction.throwSyntax(e.loc, e));
         }
 
-        res.add(Instruction.ret());
+        res.add(Instruction.ret(body.loc()));
 
-        return new CodeFunction(environment, "", subscope.localsCount(), 0, new ValueVariable[0], new FunctionBody(res.array(), subscope.captures(), subscope.locals()));
+        return new CodeFunction(environment, "", new FunctionBody(subscope.localsCount(), 0, res.array(), subscope.captures(), subscope.locals()), new ValueVariable[0]);
     }
     public static CodeFunction compile(HashMap<Long, FunctionBody> funcs, TreeSet<Location> breakpoints, Environment environment, Filename filename, String raw) {
         try {
             return compile(funcs, breakpoints, environment, parse(filename, raw));
         }
         catch (SyntaxException e) {
-            return new CodeFunction(environment, null, 2, 0, new ValueVariable[0], new FunctionBody(new Instruction[] { Instruction.throwSyntax(e).locate(e.loc) }));
+            return new CodeFunction(environment, null, new FunctionBody(Instruction.throwSyntax(e.loc, e)));
         }
     }
 }