move to test folder and fix import bug in shell

src/import.go

@@ -107,7 +107,11 @@ func importMod(realpath string, origin string, main bool) (ArObject, ArErr) {
 		return ArObject{}, translationerr
 	}
 	ArgsArArray := []any{}
-	for _, arg := range Args[1:] {
+	withoutarfile := []string{}
+	if len(Args) > 1 {
+		withoutarfile = Args[1:]
+	}
+	for _, arg := range withoutarfile {
 		ArgsArArray = append(ArgsArArray, arg)
 	}
 	global := newscope()

src/run.go

@@ -194,7 +194,9 @@ func runVal(line any, stack stack, stacklevel int) (any, ArErr) {
 	case bool:
 		return x, ArErr{}
 	case nil:
-		return nil, ArErr{}
+		return x, ArErr{}
+	case ArObject:
+		return x, ArErr{}
 	}
 	if stackoverflow {
 		return nil, ArErr{

src/thread.go

@@ -1,10 +1,13 @@
 package main
 
-import "sync"
+import (
+	"fmt"
+	"sync"
+)
 
 func ArThread(args ...any) (any, ArErr) {
-	if len(args) == 0 {
-		return nil, ArErr{TYPE: "TypeError", message: "Cannot call thread without a function", EXISTS: true}
+	if len(args) != 1 {
+		return nil, ArErr{TYPE: "TypeError", message: "Invalid number of arguments, expected 1, got " + fmt.Sprint(len(args)), EXISTS: true}
 	}
 	var tocall any
 	switch x := args[0].(type) {
@@ -26,6 +29,9 @@ func ArThread(args ...any) (any, ArErr) {
 			if hasrun {
 				return nil, ArErr{TYPE: "Runtime Error", message: "Cannot start a thread twice", EXISTS: true}
 			}
+			if len(args) != 0 {
+				return nil, ArErr{TYPE: "TypeError", message: "Invalid number of arguments, expected 0, got " + fmt.Sprint(len(args)), EXISTS: true}
+			}
 			hasrun = true
 			wg.Add(1)
 			go func() {
@@ -40,6 +46,9 @@ func ArThread(args ...any) (any, ArErr) {
 			} else if joined {
 				return nil, ArErr{TYPE: "Runtime Error", message: "Cannot join a thread twice", EXISTS: true}
 			}
+			if len(args) != 0 {
+				return nil, ArErr{TYPE: "TypeError", message: "Invalid number of arguments, expected 0, got " + fmt.Sprint(len(args)), EXISTS: true}
+			}
 			joined = true
 			wg.Wait()
 			return resp, err