diff --git a/README.md b/README.md
index a3699e08..8475306f 100644
--- a/README.md
+++ b/README.md
@@ -485,7 +485,7 @@ Future plans
         		return res;
     		}
 		}
-			
+- add `observe` modificator.		
 - static typing	
 - `@use` expressions
 		
diff --git a/lib/std.js b/lib/std.js
index 5a9d4b00..ef29a260 100644
--- a/lib/std.js
+++ b/lib/std.js
@@ -148,7 +148,7 @@ Cola._ColaRuntime$$updateProperty.i = 14;
 Cola._ColaRuntime$$proto = function _ColaRuntime$$proto(_proto) {
     function proto(){}
     proto.prototype = _proto.prototype;
-    return new c();
+    return new proto();
 };
 Cola._ColaRuntime$$proto.i = 15;
 
diff --git a/lib/translate.js b/lib/translate.js
index 6c744af4..ff750314 100644
--- a/lib/translate.js
+++ b/lib/translate.js
@@ -1339,8 +1339,15 @@ Cola.AST_Toplevel.prototype.toJavaScript = function(options){
                 body     : []
             });
 
+            var has_main_constr = false;
             node.body.forEach(function(member){
                 if(member instanceof Cola.AST_Defun && member.name instanceof Cola.AST_SymbolDefun && member.name.name == node.name.name){
+                    if(member.type != "dynamic")
+                        Cola.Parser.prototype.token_error.call(Cola.Parser.prototype, member.start, "Constructor can't have returned type.");
+
+                    if(member.mods.length != 0)
+                        Cola.Parser.prototype.token_error.call(Cola.Parser.prototype, member.start, "Constructor can't have modificators.");
+
                     if(main_constructors.some(function(constr){ return constr.name instanceof Cola.AST_Dot; }))
                         Cola.Parser.prototype.token_error.call(Cola.Parser.prototype, member.start, "Main constructor must be defined before named constructors");
 
@@ -1350,6 +1357,8 @@ Cola.AST_Toplevel.prototype.toJavaScript = function(options){
                     main_constructors.push(member);
                     newNode.push(member);
 
+                    has_main_constr = true;
+
                     if(node.extends){
                         _ColaRuntime$$hash[Cola._ColaRuntime$$proto.i] = true;
                         newNode.push(new Cola.AST_Assign({
@@ -1370,6 +1379,12 @@ Cola.AST_Toplevel.prototype.toJavaScript = function(options){
 
                 if(member instanceof Cola.AST_Defun && member.name instanceof Cola.AST_Dot && 
                    member.name.expression instanceof Cola.AST_SymbolDefun && member.name.expression.name == node.name.name){
+                    if(member.type != "dynamic")
+                        Cola.Parser.prototype.token_error.call(Cola.Parser.prototype, member.start, "Constructor can't have returned type.");
+
+                    if(member.mods.length != 0)
+                        Cola.Parser.prototype.token_error.call(Cola.Parser.prototype, member.start, "Constructor can't have modificators.");
+
                     if(main_constructors.some(function(constr){ return constr.name instanceof Cola.AST_Dot && constr.name.property == member.name.property; }))
                         Cola.Parser.prototype.token_error.call(Cola.Parser.prototype, member.start, "Constructor can be defined only one time");
 
@@ -1420,6 +1435,40 @@ Cola.AST_Toplevel.prototype.toJavaScript = function(options){
                 }
             }); 
 
+            if(!has_main_constr){
+                newNode.push(new Cola.AST_Defun({
+                    mods       : [],
+                    type       : "dynamic",
+                    name       : new Cola.AST_SymbolDefun(node.name),
+                    argnames   : [],
+                    body       : []
+                }));
+
+                main_constructors.push(newNode[newNode.length - 1]);
+
+                if(node.extends){
+                    newNode[newNode.length - 1].body.push(new Cola.AST_SimpleStatement({
+                        body : new Cola.AST_Call({
+                            expression : new Cola.AST_SymbolRef({ name: "super" }),
+                            args       : []
+                        })
+                    }));
+
+                    _ColaRuntime$$hash[Cola._ColaRuntime$$proto.i] = true;
+                    newNode.push(new Cola.AST_Assign({
+                        left     : new Cola.AST_Dot({ expression: node.name, property: "prototype" }),
+                        operator : "=",
+                        right    : new Cola.AST_Call({
+                            expression : new Cola.AST_SymbolRef({ name: "_ColaRuntime$$proto" }),
+                            args       : [node.extends]
+                        })
+                    }));
+                    newNode[newNode.length - 1] = new Cola.AST_SimpleStatement({
+                        body : newNode[newNode.length - 1]
+                    });
+                }
+            }
+
             if(pre_constructor.body.length != 0){
                 newNode.push(pre_constructor);
                 main_constructors.forEach(function(constr){
@@ -1470,7 +1519,15 @@ Cola.AST_Toplevel.prototype.toJavaScript = function(options){
                     scope = (lvl++, member);
                 else 
 
-                if(member instanceof Cola.AST_Call && member.expression instanceof Cola.AST_Symbol && member.expression.name == "super"){
+                if(member instanceof Cola.AST_Call && member.expression instanceof Cola.AST_Symbol && member.expression.name == "super" && node.extends){
+                    member.expression = new Cola.AST_Dot({
+                        expression : node.extends,
+                        property   : "call"
+                    });
+                    member.args.unshift(new Cola.AST_This);
+                } else
+
+                if(member instanceof Cola.AST_Call && member.expression instanceof Cola.AST_Dot && member.expression.expression.name == "super" && node.extends){
                     member.expression = new Cola.AST_Dot({
                         expression : member.expression,
                         property   : "call"
@@ -1478,15 +1535,7 @@ Cola.AST_Toplevel.prototype.toJavaScript = function(options){
                     member.args.unshift(new Cola.AST_This);
                 } else
 
-                if(member instanceof Cola.AST_Call && member.expression instanceof Cola.AST_Dot && member.expression.expression.name == "super"){
-                    member.expression = new Cola.AST_Dot({
-                        expression : member.expression,
-                        property   : "call"
-                    });
-                    member.args.unshift(new Cola.AST_This);
-                } else
-
-                if(member instanceof Cola.AST_SymbolRef && hmembers.indexOf(member.name) != -1){
+                if(member instanceof Cola.AST_SymbolRef && hmembers.indexOf(member.name) != -1 && node.extends){
                     if(member.name == "super"){
                         with_super = true;
                         member.name = "$uper";