Correctly work

src/optionals/importlib.c

@@ -25,10 +25,15 @@ Value includeNative(DictuVM *vm, int argCount, Value *args) {
     pop(vm);
 
     push(vm, OBJ_VAL(module));
-    module->path = getDirectory(vm, path);
+    module->path = dirname(vm, path, strlen(path));
 
     char *source = readFile(vm, path);
 
+    if (source == NULL) {
+        runtimeError(vm, "Could not open file \"%s\".", AS_CSTRING(args[0]));
+        return EMPTY_VAL;
+    }
+
     ObjFunction *function = compile(vm, module, source);
     push(vm, OBJ_VAL(function));
     FREE_ARRAY(vm, char, source, strlen(source) + 1);

tests/importlib/data/level1.du

@@ -2,4 +2,4 @@ import Importlib;
 
 const list = [5, 6, 7];
 
-const Level2 = Importlib.include('./level2.du');
+const Level2 = Importlib.include('level2.du');

tests/importlib/data/level2.du

@@ -2,4 +2,4 @@ import Importlib;
 
 const list = [3, 4, 5];
 
-const Level3 = Importlib.include('./level3.du');
+const Level3 = Importlib.include('level3.du');

tests/importlib/include.du

@@ -9,7 +9,7 @@ import Importlib;
 
 class TestImportLibInclude < UnitTest {
     testImportLibInclude() {
-        const Level1 = Importlib.include('./data/level1.du');
+        const Level1 = Importlib.include('data/level1.du');
 
         this.assertType(Level1, 'module');
         this.assertEquals(Level1.list, [5, 6, 7]);