diff --git a/lib/vast_c/vast_c.c b/lib/vast_c/vast_c.c
index cb24e05..b69c802 100644
--- a/lib/vast_c/vast_c.c
+++ b/lib/vast_c/vast_c.c
@@ -904,9 +904,13 @@ static PyObject *MakeConstantPos(Parser *P, PyObject *Value, Token *Start) {
 }
 
 /* keyword(arg, value)：arg 为 NULL 表示 **kwargs（arg=None） */
-static PyObject *MakeKeyword(Parser *P, PyObject *Arg, PyObject *Value) {
+static PyObject *MakeKeyword(Parser *P, PyObject *Arg, PyObject *Value, Token *Start) {
     PyObject *Argv[2] = { Arg ? Arg : Py_None, Value };
-    return NewNode(P, "keyword", Argv, 2);
+    PyObject *N = NewNode(P, "keyword", Argv, 2);
+    if (N != NULL) {
+        FixLoc(P, N, Start);
+    }
+    return N;
 }
 
 static PyObject *MakeStarred(Parser *P, PyObject *Value) {
@@ -2545,7 +2549,7 @@ static PyObject *ParseCallTail(Parser *P, PyObject *Func, Token *Start) {
                     Py_DECREF(Keywords);
                     return NULL;
                 }
-                PyObject *Kw = MakeKeyword(P, NULL, Value);
+                PyObject *Kw = MakeKeyword(P, NULL, Value, PrevTok(P));
                 Py_DECREF(Value);
                 if (Kw == NULL) {
                     Py_DECREF(Args);
@@ -2587,7 +2591,7 @@ static PyObject *ParseCallTail(Parser *P, PyObject *Func, Token *Start) {
                         }
                         PyObject *Arg = PyUnicode_FromStringAndSize(NameTok->Start,
                                                                     NameTok->End - NameTok->Start);
-                        PyObject *Kw = MakeKeyword(P, Arg, Value);
+                        PyObject *Kw = MakeKeyword(P, Arg, Value, NameTok);
                         Py_XDECREF(Arg);
                         Py_DECREF(Value);
                         if (Kw == NULL) {
@@ -4423,9 +4427,8 @@ static PyObject *ParseImport(Parser *P) {
             Py_DECREF(Names);
             return NULL;
         }
-        /* alias 无位置属性 */
-        (void)NameTok;
-        (void)EndTok;
+        /* alias 需与 vast 一致携带位置属性（编译器符号注册按节点位置关联） */
+        FixLoc(P, Alias, NameTok);
         PyList_Append(Names, Alias);
         Py_DECREF(Alias);
         if (AtOp(P, ",")) {
@@ -4548,7 +4551,7 @@ static PyObject *ParseImportFrom(Parser *P) {
                 Py_XDECREF(Module);
                 return NULL;
             }
-            (void)StarTok;
+            FixLoc(P, Alias, StarTok);
             PyList_Append(Names, Alias);
             Py_DECREF(Alias);
         } else {
@@ -4608,6 +4611,9 @@ static PyObject *ParseImportAlias(Parser *P) {
     PyObject *Alias = NewNode(P, "alias", Argv, 2);
     Py_DECREF(Name);
     Py_XDECREF(Asname);
+    if (Alias != NULL) {
+        FixLoc(P, Alias, NameTok);
+    }
     return Alias;
 }
 
@@ -5108,7 +5114,7 @@ static PyObject *ParseClassDef(Parser *P, PyObject *Decorators) {
                         Py_DECREF(TypeParams);
                         return NULL;
                     }
-                    PyObject *Kw = MakeKeyword(P, NULL, Value);
+                    PyObject *Kw = MakeKeyword(P, NULL, Value, PrevTok(P));
                     Py_DECREF(Value);
                     if (Kw == NULL) {
                         Py_DECREF(Bases);
@@ -5133,7 +5139,7 @@ static PyObject *ParseClassDef(Parser *P, PyObject *Decorators) {
                         }
                         PyObject *Arg = PyUnicode_FromStringAndSize(ArgTok->Start,
                                                                     ArgTok->End - ArgTok->Start);
-                        PyObject *Kw = MakeKeyword(P, Arg, Value);
+                        PyObject *Kw = MakeKeyword(P, Arg, Value, ArgTok);
                         Py_XDECREF(Arg);
                         Py_DECREF(Value);
                         if (Kw == NULL) {