diff --git a/main.cpp b/main.cpp
index 2ce3eba..170dfb0 100644
--- a/main.cpp
+++ b/main.cpp
@@ -10,15 +10,15 @@ nasal_vm       vm;
 void help()
 {
 	std::cout
-	<<">> [\"file\"] input a file name.                          \n"
-	<<">> [help  ] show help.                                    \n"
-	<<">> [clear ] clear the screen.                             \n"
-	<<">> [lex   ] use lexer to turn code into tokens.           \n"
-	<<">> [ast   ] do parsing and check the abstract syntax tree.\n"
-	<<">> [code  ] show byte code.                               \n"
-	<<">> [exec  ] execute program on bytecode vm.               \n"
-	<<">> [logo  ] print logo of nasal .                         \n"
-	<<">> [exit  ] quit nasal interpreter.                       \n";
+	<<">> [\"file\"] input file name.              \n"
+	<<">> [help  ] show help.                      \n"
+	<<">> [clear ] clear the screen.               \n"
+	<<">> [lex   ] view tokens.                    \n"
+	<<">> [ast   ] view abstract syntax tree.      \n"
+	<<">> [code  ] view byte code.                 \n"
+	<<">> [exec  ] execute program on bytecode vm. \n"
+	<<">> [logo  ] print logo of nasal .           \n"
+	<<">> [exit  ] quit nasal interpreter.         \n";
 	return;
 }
 
@@ -39,16 +39,6 @@ void die(std::string stage,std::string filename)
 	return;
 }
 
-void clear()
-{
-	// this will clear the data in lexer/parser/import modules
-	// to reduce memory footprint
-	lexer.get_token_list().clear();
-	parse.get_root().clear();
-	import.get_root().clear();
-	return;
-}
-
 void execute(std::string& command)
 {
 	lexer.openfile(file);
@@ -61,7 +51,6 @@ void execute(std::string& command)
 	if(command=="lex")
 	{
 		lexer.print_token();
-		clear();
 		return;
 	}
 	parse.set_toklist(lexer.get_token_list());
@@ -74,7 +63,6 @@ void execute(std::string& command)
 	if(command=="ast")
 	{
 		parse.get_root().print_ast(0);
-		clear();
 		return;
 	}
 	import.link(parse.get_root());
@@ -84,7 +72,11 @@ void execute(std::string& command)
 		return;
 	}
 	codegen.main_progress(import.get_root());
-	clear();
+	if(codegen.get_error())
+	{
+		die("codegen",file);
+		return;
+	}
 	if(command=="code")
 	{
 		codegen.print_byte_code();
diff --git a/nasal_codegen.h b/nasal_codegen.h
index 0404243..e1a31ae 100644
--- a/nasal_codegen.h
+++ b/nasal_codegen.h
@@ -4,7 +4,6 @@
 enum op_code
 {
     op_nop,
-    op_load,// load value in value_stack to identifier
     op_loadg,
     op_loadl,
     op_pnum,
@@ -43,13 +42,12 @@ enum op_code
     op_jmp,      // jump with no condition
     op_jt,       // used in operator and/or,jmp when condition is true and DO NOT POP
     op_jf,       // used in conditional/loop,jmp when condition is false and POP STACK
-    op_counter,  // add counter for forindex/foreach
+    op_cnt,      // add counter for forindex/foreach
     op_cntpop,   // pop counter
     op_findex,   // index counter on the top of forindex_stack plus 1
     op_feach,    // index counter on the top of forindex_stack plus 1 and get the value in vector
-    op_call,     // call identifier
-    op_callg,
-    op_calll,
+    op_callg,    // call value in global scope
+    op_calll,    // call value in local scope
     op_callv,    // call vec[index]
     op_callvi,   // call vec[immediate] (used in multi-assign/multi-define)
     op_callh,    // call hash.label
@@ -59,11 +57,10 @@ enum op_code
     op_slcend,   // end of slice
     op_slc,      // slice like vec[1]
     op_slc2,     // slice like vec[nil:10]
-    op_mcall,    // get memory of identifier
-    op_mcallg,
-    op_mcalll,
-    op_mcallv,   // get memory of vec[index]
-    op_mcallh,   // get memory of hash.label
+    op_mcallg,   // get memory space of value in global scope
+    op_mcalll,   // get memory space of value in local scope
+    op_mcallv,   // get memory space of vec[index]
+    op_mcallh,   // get memory space of hash.label
     op_ret       // return
 };
 
@@ -74,7 +71,6 @@ struct
 }code_table[]=
 {
     {op_nop,      "nop   "},
-    {op_load,     "load  "},
     {op_loadg,    "loadg "},
     {op_loadl,    "loadl "},
     {op_pnum,     "pnum  "},
@@ -113,11 +109,10 @@ struct
     {op_jmp,      "jmp   "},
     {op_jt,       "jt    "},
     {op_jf,       "jf    "},
-    {op_counter,  "cnt   "},
+    {op_cnt,      "cnt   "},
     {op_cntpop,   "cntpop"},
     {op_findex,   "findx "},
     {op_feach,    "feach "},
-    {op_call,     "call  "},
     {op_callg,    "callg "},
     {op_calll,    "calll "},
     {op_callv,    "callv "},
@@ -129,7 +124,6 @@ struct
     {op_slcend,   "slcend"},
     {op_slc,      "slc   "},
     {op_slc2,     "slc2  "},
-    {op_mcall,    "mcall "},
     {op_mcallg,   "mcallg"},
     {op_mcalll,   "mcalll"},
     {op_mcallv,   "mcallv"},
@@ -172,10 +166,12 @@ private:
     std::vector<std::string>             global;
     std::list<std::vector<std::string> > local;
     
+    void die(std::string,int);
     void regist_number(double);
     void regist_string(std::string&);
-    void add_sym(std::string&);
-    bool find_sym(std::string&);
+    void add_sym(std::string);
+    bool local_find(std::string&);
+    bool global_find(std::string&);
     void gen(unsigned char,unsigned int);
     void pop_gen();
     void nil_gen();
@@ -212,6 +208,7 @@ private:
     void ret_gen(nasal_ast&);
 public:
     nasal_codegen();
+    int                       get_error();
     void                      main_progress(nasal_ast&);
     void                      print_op(int);
     void                      print_byte_code();
@@ -228,10 +225,17 @@ nasal_codegen::nasal_codegen()
     return;
 }
 
+void nasal_codegen::die(std::string info,int line)
+{
+    ++error;
+    std::cout<<">> [code] line "<<line<<": "<<info<<"\n";
+    return;
+}
+
 void nasal_codegen::regist_number(double num)
 {
     int size=number_table.size();
-    if(number_table.find(num)==number_table.end())
+    if(!number_table.count(num))
         number_table[num]=size;
     return;
 }
@@ -239,23 +243,47 @@ void nasal_codegen::regist_number(double num)
 void nasal_codegen::regist_string(std::string& str)
 {
     int size=string_table.size();
-    if(string_table.find(str)==string_table.end())
+    if(!string_table.count(str))
         string_table[str]=size;
     return;
 }
 
-void nasal_codegen::add_sym(std::string&)
+void nasal_codegen::add_sym(std::string name)
 {
     if(local.empty())
-    ;
+    {
+        for(int i=0;i<global.size();++i)
+            if(global[i]==name)
+                return;
+        regist_string(name);
+        global.push_back(name);
+    }
     else
-    ;
+    {
+        for(auto i=local.begin();i!=local.end();++i)
+            for(int j=0;j<i->size();++j)
+                if((*i)[j]==name)
+                    return;
+        regist_string(name);
+        local.front().push_back(name);
+    }
     return;
 }
 
-bool nasal_codegen::find_sym(std::string&)
+bool nasal_codegen::local_find(std::string& name)
 {
+    for(auto i=local.begin();i!=local.end();++i)
+        for(int j=0;j<i->size();++j)
+            if((*i)[j]==name)
+                return true;
+    return false;
+}
 
+bool nasal_codegen::global_find(std::string& name)
+{
+    for(int i=0;i<global.size();++i)
+        if(global[i]==name)
+            return true;
     return false;
 }
 
@@ -332,6 +360,15 @@ void nasal_codegen::func_gen(nasal_ast& ast)
     int newfunc_label=exec_code.size();
     gen(op_newf,0);
 
+    std::vector<std::string> new_scope;
+    local.push_front(new_scope); // symbol table push front
+
+    // add special keyword 'me' into symbol table
+    // this symbol is only used in local scope(function's scope)
+    // this keyword is set to nil as default value
+    // after calling a hash, this keyword is set to this hash
+    add_sym("me");
+
     nasal_ast& ref_arg=ast.get_children()[0];
     int arg_size=ref_arg.get_children().size();
     for(int i=0;i<arg_size;++i)
@@ -340,20 +377,20 @@ void nasal_codegen::func_gen(nasal_ast& ast)
         if(tmp.get_type()==ast_id)
         {
             std::string str=tmp.get_str();
-            regist_string(str);
+            add_sym(str);
             gen(op_para,string_table[str]);
         }
         else if(tmp.get_type()==ast_default_arg)
         {
             calc_gen(tmp.get_children()[1]);
             std::string str=tmp.get_children()[0].get_str();
-            regist_string(str);
+            add_sym(str);
             gen(op_defpara,string_table[str]);
         }
         else if(tmp.get_type()==ast_dynamic_id)
         {
             std::string str=tmp.get_str();
-            regist_string(str);
+            add_sym(str);
             gen(op_dynpara,string_table[str]);
         }
     }
@@ -362,10 +399,9 @@ void nasal_codegen::func_gen(nasal_ast& ast)
     gen(op_jmp,0);
     nasal_ast& block=ast.get_children()[1];
 
-    std::vector<std::string> new_scope;
-    local.push_front(new_scope);
     block_gen(block);
-    local.pop_front();
+    local.pop_front(); // symbol table pop front
+
     if(!block.get_children().size() || block.get_children().back().get_type()!=ast_return)
     {
         nil_gen();
@@ -404,7 +440,12 @@ void nasal_codegen::call_id(nasal_ast& ast)
             gen(op_callb,i);
             return;
         }
-    gen(op_call,string_table[str]);
+    if(local_find(str))
+        gen(op_calll,string_table[str]);
+    else if(global_find(str))
+        gen(op_callg,string_table[str]);
+    else
+        die("cannot find symbol named \""+str+"\".",ast.get_line());
     return;
 }
 
@@ -479,7 +520,12 @@ void nasal_codegen::mcall_id(nasal_ast& ast)
 {
     std::string str=ast.get_str();
     regist_string(str);
-    gen(op_mcall,string_table[str]);
+    if(local_find(str))
+        gen(op_mcalll,string_table[str]);
+    else if(global_find(str))
+        gen(op_mcallg,string_table[str]);
+    else
+        die("cannot find symbol named \""+str+"\".",ast.get_line());
     return;
 }
 
@@ -500,10 +546,10 @@ void nasal_codegen::mcall_hash(nasal_ast& ast)
 
 void nasal_codegen::single_def(nasal_ast& ast)
 {
-    calc_gen(ast.get_children()[1]);
     std::string str=ast.get_children()[0].get_str();
-    regist_string(str);
-    gen(op_load,string_table[str]);
+    add_sym(str);
+    calc_gen(ast.get_children()[1]);
+    gen(local.empty()?op_loadg:op_loadl,string_table[str]);
     return;
 }
 void nasal_codegen::multi_def(nasal_ast& ast)
@@ -513,10 +559,10 @@ void nasal_codegen::multi_def(nasal_ast& ast)
     {
         for(int i=0;i<size;++i)
         {
-            calc_gen(ast.get_children()[1].get_children()[i]);
             std::string str=ast.get_children()[0].get_children()[i].get_str();
-            regist_string(str);
-            gen(op_load,string_table[str]);
+            add_sym(str);
+            calc_gen(ast.get_children()[1].get_children()[i]);
+            gen(local.empty()?op_loadg:op_loadl,string_table[str]);
         }
     }
     else
@@ -526,8 +572,8 @@ void nasal_codegen::multi_def(nasal_ast& ast)
         {
             gen(op_callvi,i);
             std::string str=ast.get_children()[0].get_children()[i].get_str();
-            regist_string(str);
-            gen(op_load,string_table[str]);
+            add_sym(str);
+            gen(local.empty()?op_loadg:op_loadl,string_table[str]);
         }
         pop_gen();
     }
@@ -711,14 +757,14 @@ void nasal_codegen::for_gen(nasal_ast& ast)
 void nasal_codegen::forindex_gen(nasal_ast& ast)
 {
     calc_gen(ast.get_children()[1]);
-    gen(op_counter,0);
+    gen(op_cnt,0);
     int ptr=exec_code.size();
     gen(op_findex,0);
     if(ast.get_children()[0].get_type()==ast_new_iter)
     {
         std::string str=ast.get_children()[0].get_children()[0].get_str();
-        regist_string(str);
-        gen(op_load,string_table[str]);
+        add_sym(str);
+        gen(local.empty()?op_loadg:op_loadl,string_table[str]);
     }
     else
     {
@@ -738,14 +784,14 @@ void nasal_codegen::forindex_gen(nasal_ast& ast)
 void nasal_codegen::foreach_gen(nasal_ast& ast)
 {
     calc_gen(ast.get_children()[1]);
-    gen(op_counter,0);
+    gen(op_cnt,0);
     int ptr=exec_code.size();
     gen(op_feach,0);
     if(ast.get_children()[0].get_type()==ast_new_iter)
     {
         std::string str=ast.get_children()[0].get_children()[0].get_str();
-        regist_string(str);
-        gen(op_load,string_table[str]);
+        add_sym(str);
+        gen(local.empty()?op_loadg:op_loadl,string_table[str]);
     }
     else
     {
@@ -951,6 +997,9 @@ void nasal_codegen::main_progress(nasal_ast& ast)
     string_table.clear();
     exec_code.clear();
 
+    global.clear();
+    local.clear();
+
     int size=ast.get_children().size();
     for(int i=0;i<size;++i)
     {
@@ -1022,15 +1071,18 @@ void nasal_codegen::print_op(int index)
         case op_pnum:std::cout<<'('<<num_res_table[exec_code[index].num]<<')';break;
         case op_callb:std::cout<<'('<<builtin_func[exec_code[index].num].name<<')';break;
         case op_happ:
-        case op_call:
-        case op_mcall:
+        case op_callg:
+        case op_calll:
+        case op_mcallg:
+        case op_mcalll:
         case op_pstr:
         case op_callh:
         case op_mcallh:
         case op_para:
         case op_defpara:
         case op_dynpara:
-        case op_load:std::cout<<'('<<str_res_table[exec_code[index].num]<<')';break;
+        case op_loadg:
+        case op_loadl:std::cout<<'('<<str_res_table[exec_code[index].num]<<')';break;
     }
     std::cout<<'\n';
     return;
@@ -1063,4 +1115,9 @@ std::vector<opcode>& nasal_codegen::get_exec_code()
     return exec_code;
 }
 
+int nasal_codegen::get_error()
+{
+    return error;
+}
+
 #endif
\ No newline at end of file
diff --git a/nasal_gc.h b/nasal_gc.h
index 6f8c5bc..a793e4e 100644
--- a/nasal_gc.h
+++ b/nasal_gc.h
@@ -333,13 +333,13 @@ struct nasal_gc
     nasal_val*               one_addr;    // reserved address of nasal_val,type vm_num, 1
     nasal_val*               nil_addr;    // reserved address of nasal_val,type vm_nil
     nasal_val*               global;      // global scope address,type vm_scop
-    nasal_val**              val_stack;   // main stack
+    nasal_val*               val_stack[STACK_MAX_DEPTH];
     nasal_val**              stack_top;   // stack top
     std::vector<nasal_val*>  num_addrs;   // reserved address for const vm_num
     std::vector<nasal_val*>  local;       // local scope for function block
     std::vector<nasal_val*>  slice_stack; // slice stack for vec[val,val,val:val]
     std::vector<nasal_val*>  memory;      // gc memory
-    std::queue<nasal_val*>   free_list;   // gc free list
+    std::queue <nasal_val*>  free_list;   // gc free list
     void                     mark();
     void                     sweep();
     void                     gc_init(std::vector<double>&);
@@ -430,7 +430,6 @@ void nasal_gc::gc_init(std::vector<double>& nums)
         memory.push_back(tmp);
         free_list.push(tmp);
     }
-    val_stack=new nasal_val*[STACK_MAX_DEPTH]; // init runtime stack
     stack_top=val_stack; // set stack_top to val_stack
 
     zero_addr=new nasal_val(vm_num); // init constant 0
@@ -470,7 +469,6 @@ void nasal_gc::gc_clear()
     while(!free_list.empty())
         free_list.pop();
     global=nullptr;
-    delete []val_stack;
     local.clear();
     slice_stack.clear();
     return;
diff --git a/nasal_vm.h b/nasal_vm.h
index 5ac4ccf..a5e6c26 100644
--- a/nasal_vm.h
+++ b/nasal_vm.h
@@ -20,7 +20,6 @@ private:
     void die(std::string);
     bool condition(nasal_val*);
     void opr_nop();
-    void opr_load();
     void opr_loadg();
     void opr_loadl();
     void opr_pnum();
@@ -63,7 +62,6 @@ private:
     void opr_cntpop();
     void opr_findex();
     void opr_feach();
-    void opr_call();
     void opr_callg();
     void opr_calll();
     void opr_callv();
@@ -75,7 +73,6 @@ private:
     void opr_slcend();
     void opr_slc();
     void opr_slc2();
-    void opr_mcall();
     void opr_mcallg();
     void opr_mcalll();
     void opr_mcallv();
@@ -153,12 +150,6 @@ void nasal_vm::opr_nop()
     loop_mark=false;
     return;
 }
-void nasal_vm::opr_load()
-{
-    nasal_val* val=*stack_top--;
-    (gc.local.empty()?gc.global:gc.local.back())->ptr.scop->elems[exec_code[pc].num]=val;
-    return;
-}
 void nasal_vm::opr_loadg()
 {
     gc.global->ptr.scop->elems[exec_code[pc].num]=*stack_top--;
@@ -214,6 +205,7 @@ void nasal_vm::opr_newf()
     val->ptr.func->entry=exec_code[pc].num;
     if(!gc.local.empty())
         val->ptr.func->closure=gc.local.back()->ptr.scop->elems;
+    val->ptr.func->closure[me]=gc.nil_addr;
     *(++stack_top)=val;
     return;
 }
@@ -561,26 +553,6 @@ void nasal_vm::opr_feach()
     *(++stack_top)=res;
     return;
 }
-void nasal_vm::opr_call()
-{
-    nasal_val* val=nullptr;
-    int name_index=exec_code[pc].num;
-    if(!gc.local.empty())
-        val=gc.local.back()->ptr.scop->get_val(name_index);
-    if(val)
-    {
-        *(++stack_top)=val;
-        return;
-    }
-    val=gc.global->ptr.scop->get_val(name_index);
-    if(val)
-    {
-        *(++stack_top)=val;
-        return;
-    }
-    die("call: cannot find symbol named \""+str_table[name_index]+"\"");
-    return;
-}
 void nasal_vm::opr_callg()
 {
     *(++stack_top)=gc.global->ptr.scop->elems[exec_code[pc].num];
@@ -826,26 +798,6 @@ void nasal_vm::opr_slc2()
         aim.push_back(ref[i]);
     return;
 }
-void nasal_vm::opr_mcall()
-{
-    nasal_val** mem_addr=nullptr;
-    int name_index=exec_code[pc].num;
-    if(!gc.local.empty())
-        mem_addr=gc.local.back()->ptr.scop->get_mem(name_index);
-    if(mem_addr)
-    {
-        addr_stack.push(mem_addr);
-        return;
-    }
-    mem_addr=gc.global->ptr.scop->get_mem(name_index);
-    if(mem_addr)
-    {
-        addr_stack.push(mem_addr);
-        return;
-    }
-    die("mcall: cannot find symbol named \""+str_table[name_index]+"\"");
-    return;
-}
 void nasal_vm::opr_mcallg()
 {
     addr_stack.push(&gc.global->ptr.scop->elems[exec_code[pc].num]);
@@ -938,7 +890,6 @@ void nasal_vm::run()
     static void (nasal_vm::*opr_table[])()=
     {
         &nasal_vm::opr_nop,
-        &nasal_vm::opr_load,
         &nasal_vm::opr_loadg,
         &nasal_vm::opr_loadl,
         &nasal_vm::opr_pnum,
@@ -981,7 +932,6 @@ void nasal_vm::run()
         &nasal_vm::opr_cntpop,
         &nasal_vm::opr_findex,
         &nasal_vm::opr_feach,
-        &nasal_vm::opr_call,
         &nasal_vm::opr_callg,
         &nasal_vm::opr_calll,
         &nasal_vm::opr_callv,
@@ -993,7 +943,6 @@ void nasal_vm::run()
         &nasal_vm::opr_slcend,
         &nasal_vm::opr_slc,
         &nasal_vm::opr_slc2,
-        &nasal_vm::opr_mcall,
         &nasal_vm::opr_mcallg,
         &nasal_vm::opr_mcalll,
         &nasal_vm::opr_mcallv,
diff --git a/test/ai.nas b/test/ai.nas
index d3ff325..f66bc8f 100644
--- a/test/ai.nas
+++ b/test/ai.nas
@@ -81,13 +81,12 @@ var matrix=
         var prt_s='[\n';
         foreach(var i;mat.mat)
         {
-            var s='[';
+            prt_s~='[';
             foreach(var j;i)
-                s~=(j~',');
-            s~='],\n';
-            prt_s~=s;
+                prt_s~=(j~',');
+            prt_s~='],\n';
         }
-        prt_s~=']';
+        prt_s~=']\n';
         print(prt_s);
         return nil;
     },
@@ -295,9 +294,9 @@ var bp=
         var hidden_diff=matrix.mult_mat();
         matrix.prt_mat(hidden_diff);
 
-        output_layer=matrix.add_mat(output_layer,output_diff);
+        me.output_layer=matrix.add_mat(me.output_layer,output_diff);
         var error=0;
-        foreach(var i;tmp.mat[0])
+        foreach(var i;me.result.mat[0])
             error+=i;
         error*=0.5;
         return error;
diff --git a/test/call_ide.nas b/test/call_ide.nas
deleted file mode 100644
index 4d593bb..0000000
--- a/test/call_ide.nas
+++ /dev/null
@@ -1,30 +0,0 @@
-id[0] and id[1];
-1 or 2;
-"str" ==1;
-1*1/1+1;
-2*3*4/1-2+3;
-1-1+20-2*10;
-1+s1*(s2+s3[0])-1;
-var e=1+s1*(s2+s3[0])-1;
-id;
-"str";
-id(id);
-id("str",1,1);
-var e=1;
-var x=10*2-20;
-var id;
-var id=[1,2,3,4];
-var id={id:"str"};
-id();
-id.id();
-id.id.id();
-id[0].id.id(id,"str",1,2,3,4).id[10];
-id(0)[1].id;
-var hash={
-   h:"hello",
-   parent:[id],
-};
-function_test([1,2,3,4,55],1,2,3,{str:"str"});
-var (i,j,k,l,m,n) =[1,2,3,4,5,6];
-(var i,j,k)=[1,2,3];
-e=e[1:][0];
\ No newline at end of file
diff --git a/test/choice.nas b/test/choice.nas
index 2f9dcec..6de525d 100644
--- a/test/choice.nas
+++ b/test/choice.nas
@@ -1,4 +1,4 @@
-
+import("lib.nas");
 var condition_true=1;
 var condition_false=0;
 if(condition_true)
diff --git a/test/json.nas b/test/json.nas
index 8ed0a33..39f5686 100644
--- a/test/json.nas
+++ b/test/json.nas
@@ -1,4 +1,5 @@
 #lib json.nas
+import("lib.nas");
 var json={
     text:'',
     line:1,
diff --git a/test/leetcode1319.nas b/test/leetcode1319.nas
index a1e64e4..b34890f 100644
--- a/test/leetcode1319.nas
+++ b/test/leetcode1319.nas
@@ -29,4 +29,4 @@ var makeConnect=func(n,connections)
     return cnt;
 }
 
-print(makeConnect(n,input));
\ No newline at end of file
+println(makeConnect(n,input));
\ No newline at end of file
diff --git a/test/nasal_test.nas b/test/nasal_test.nas
index 3959aa9..4166e8f 100644
--- a/test/nasal_test.nas
+++ b/test/nasal_test.nas
@@ -1,10 +1,10 @@
-#//This is written for Nasal Intepreter
-#//Sidi Liang
-
+# This is written for Nasal Intepreter
+# Sidi Liang
+import("lib.nas");
 var w = 1;
 var x = "hello";
 var f = func(){
-    print("f is called");
+    println("f is called");
 }
 var f2 = func(){
     return 2;
@@ -28,71 +28,27 @@ var z1 = {
     hashh:z
 };
 var y2 = [w, x, y, z1];
-
 var z2 = {
     hashh: z1,
     listt2: y2,
 };
 
-print(w);#//1
-print("\n");
-print(x);#//hello
-print("\n");
-print(y);#//Empty
-print("\n");
-print(z);#//Empty
-print("\n");
-print(z1);#//Empty
-print("\n");
-print(y2);#//Empty
-print("\n");
-print(y[0]);#//1
-print("\n");
-print(y1[2][1]);#//hello
-print("\n");
-print(z.numb);#//1
-print("\n");
-print(z.listt[2][1]);#//hello
-print("\n");
-print(z1.hashh.listt[2][1]);#//hello
-print("\n");
-print(y2[3].hashh.listt[2][1]);#//hello
-print("\n");
-print(f);#//Empty
-print("\n");
+println(w);#//1
+println(x);#//hello
+println(y);#//[1,hello]
+println(z);#//{...}
+println(z1);#//{...}
+println(y2);#//[...]
+println(y[0]);#//1
+println(y1[2][1]);#//hello
+println(z.numb);#//1
+println(z.listt[2][1]);#//hello
+println(z1.hashh.listt[2][1]);#//hello
+println(y2[3].hashh.listt[2][1]);#//hello
+println(f);#//func(...){...}
 f();#//f is called
-print("\n");
-print(z.funcc);#//Empty
-print("\n");
+println(z.funcc);#//func(...){...}
 z.funcc();#//f is called
-print("\n");
-print(z.funcccall);#//Empty
-print("\n");
-z.funcccall();#//f is called
-print("\n");
+println(z.funcccall);#//nil
 z2.listt2[3].hashh.funcc();#//f is called
-print("\n");
-print(y1[f2()][w]);#//hello
-print("\n");
-#//print(z.f3()); Error
-call(f);#//f is called
-print("\n");
-call(z.funcc);#//f is called
-print("\n");
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+println(y1[f2()][w]);#//hello
\ No newline at end of file
diff --git a/test/neo4j.nas b/test/neo4j.nas
index 91e7faa..da44c4a 100644
--- a/test/neo4j.nas
+++ b/test/neo4j.nas
@@ -1,12 +1,12 @@
 import("lib.nas");
 
 rand(time(0));
-var chartable=split('','abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789');
+var chartable='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
 var node=func(type)
 {
     var s="";
     for(var i=0;i<10;i+=1)
-        s~=chartable[rand()*62];
+        s~=chr(chartable[rand()*62]);
     return {name:s,type:type,next:[]};
 }
 var film_node=[];
diff --git a/test/quick_sort.nas b/test/quick_sort.nas
index 9bc78e7..92c4dd7 100644
--- a/test/quick_sort.nas
+++ b/test/quick_sort.nas
@@ -26,7 +26,7 @@ var sort=func(vec,left,right)
     return nil;
 }
 var vec=[];
-for(var i=0;i<500;i+=1)
+for(var i=0;i<200;i+=1)
     append(vec,int(rand()*1000));
 sort(vec,0,size(vec)-1);
 println(vec);
\ No newline at end of file
diff --git a/test/scalar.nas b/test/scalar.nas
index d758541..7cccca2 100644
--- a/test/scalar.nas
+++ b/test/scalar.nas
@@ -115,7 +115,7 @@ var multi_assign_2=[10,9,8,7];
 ((-1*2+9))/7-1;
 ((({num:2})))["num"]*2*2*2;
 ((((([0,1,2])[0:2]))[0:2]))[1]-1;
-(((((((((((((((((((1+1+2+3+5)+8))+13)))+21))))+34)))))+55))))*89;
+println((((((((((((((((((((1+1+2+3+5)+8))+13)))+21))))+34)))))+55))))*89); # 12727
 number_1*(number_2+number_3)/90-number_4;
 (func test_func)()-1;
 hash_3.member_3+(func {return {what:"i don't tell you.",case_small:80,case_large:100}})()["case_large"]/10;
@@ -129,7 +129,7 @@ nil and 1+7*8;
 var hash={str:'hello',f:func{return me.str;}};
 var tmp_f=hash.f;
 hash=1;
-print(tmp_f());
+println(tmp_f());
 # undefined symbol 'me'
 # this means that 
 # when generating local_scope for function f,
@@ -138,13 +138,13 @@ print(tmp_f());
 var h1={str:'hello',f:func{return me.str;}};
 var h2={str:'world',f:func{return nil;}};
 h2.f=h1.f;
-print(h2.f());
+println(h2.f());
 # print 'world'
 # this means that 'me' in hash's functions
 # only points to the hash this function belongs to
 
-var f1=func(){print(1);return 1;}
-var f2=func(){print(2);return 0;}
+var f1=func(){println(1);return 1;}
+var f2=func(){println(2);return 0;}
 f1() or f2();
 # print '1'
 # this means that when using 'or' or 'and',
diff --git a/test/special.nas b/test/special.nas
deleted file mode 100644
index f581ac2..0000000
--- a/test/special.nas
+++ /dev/null
@@ -1,24 +0,0 @@
-var hash={str:'hello',f:func{return me.str;}};
-var tmp_f=hash.f;
-hash=1;
-print(tmp_f());
-# undefined symbol 'me'
-# this means that 
-# when generating local_scope for function f,
-# nasal_gc will not count 'me' as one reference of this hash
-
-var h1={str:'hello',f:func{return me.str;}};
-var h2={str:'world',f:func{return nil;}};
-h2.f=h1.f;
-print(h2.f());
-# print 'world'
-# this means that 'me' in hash's functions
-# only points to the hash this function belongs to
-
-var f1=func(){print(1);return 1;}
-var f2=func(){print(2);return 0;}
-f1() or f2();
-# print '1'
-# this means that when using 'or' or 'and',
-# if the result is clear when calculating,
-# objects behind will not be calculated
\ No newline at end of file