diff --git a/lib/core/Handles/HandlesExprAttr.py b/lib/core/Handles/HandlesExprAttr.py
index b388871..875061a 100644
--- a/lib/core/Handles/HandlesExprAttr.py
+++ b/lib/core/Handles/HandlesExprAttr.py
@@ -1781,11 +1781,43 @@ class ExprAttrHandle(BaseHandle):
             if VarName == 'self':
                 ClassName: str | None = self.Trans._CurrentCpythonObjectClass
                 if ClassName:
-                    offset: int | None = Gen._get_member_offset(Node.attr, ClassName)
                     SelfVar: Any = Gen._get_var_ptr('self')
                     if SelfVar:
                         SelfPtr: Any = Gen._load(SelfVar, name="self")
                         if isinstance(SelfPtr.type, ir.PointerType):
+                            # 基址 pointee 若**未具化**（opaque）：typed pointer 下 GEP 必须
+                            # 在编译期算出元素类型，否则 llvmlite 内部抛裸 TypeError
+                            # （'NoneType' object is not subscriptable）。与**同函数下方
+                            # 各分支**（属性链分支 / i8* 分支：均先 _TryLoadStructFromStub
+                            # 补 body、再 bitcast 到已具化实例）同口径 —— 偏移与 GEP 必须
+                            # 同源；本分支此前是唯一漏了这套处理的分支。
+                            # 现场（2026-09-30）：includes/ast/astaux.vp:165
+                            # `self.arg = _copy_str(pool, arg)`，GEP 名 'arg'，基址 pointee
+                            # 是 opaque 的 `%"8312ce86a2fd82c0.Keyword"*`，而同短名的
+                            # 'Keyword' 键上那份已具化（10 槽）。
+                            _SelfPointee: Any = SelfPtr.type.pointee
+                            if (isinstance(_SelfPointee, ir.IdentifiedStructType)
+                                    and _SelfPointee.elements is None):
+                                _ST: Any = Gen.structs.get(ClassName)
+                                if isinstance(_ST, ir.IdentifiedStructType) and not _ST.elements:
+                                    self.Trans.ImportHandler._TryLoadStructFromStub(ClassName, Gen)
+                                    _ST = Gen.structs.get(ClassName, _ST)
+                                _Twin: Any = None
+                                if isinstance(_ST, ir.IdentifiedStructType) and _ST.elements:
+                                    _Twin = _ST
+                                else:
+                                    try:
+                                        _Twin = Gen._FindConcreteTwin(_SelfPointee)
+                                    except Exception:
+                                        _Twin = None
+                                if _Twin is not None:
+                                    SelfPtr = Gen.builder.bitcast(
+                                        SelfPtr, ir.PointerType(_Twin),
+                                        name=f"cast_self_{ClassName}")
+                                    _SelfPointee = _Twin
+                            offset: int | None = Gen._get_member_offset(Node.attr, ClassName, _SelfPointee)
+                            if offset is None:
+                                return None
                             MemberPtr: Any = Gen.builder.gep(SelfPtr, [ir.Constant(ir.IntType(32), 0), ir.Constant(ir.IntType(32), offset)], name=Node.attr)
                             return MemberPtr
             ClassName = Gen.var_struct_class.get(VarName)
diff --git a/lib/core/LLVMCG/BaseGen.py b/lib/core/LLVMCG/BaseGen.py
index 0af055d..7c3157a 100644
--- a/lib/core/LLVMCG/BaseGen.py
+++ b/lib/core/LLVMCG/BaseGen.py
@@ -88,6 +88,25 @@ def RequirePointerOperand(Value: Any, OpName: str, Gen: Any = None, Detail: str
                         _Kin.append(f"{_k_n}({getattr(_k_v, 'name', '?')})={_k_cnt}")
                     if _Kin:
                         _MsgP += "\n  同短名 struct 实例（key(IR 名)=槽数）: " + ", ".join(_Kin)
+                # TPC 发射点（由内向外，最内 3 帧）：行号只能指到**语句**，无法区分
+                # 同一语句里是哪个 GEP 点（现场 astaux.vp:165 `self.arg = _copy_str(...)`
+                # 在读写两侧共有多个候选发射点，逐个读代码无法判定）。取栈中位于本仓
+                # lib/、且不在本文件（守卫自身）的最内 3 帧，报出 文件:行(函数)。
+                try:
+                    import traceback as _tb
+                    _Sites: list[str] = []
+                    for _fr in reversed(_tb.extract_stack()):
+                        _fn: str = (getattr(_fr, 'filename', '') or '').replace('\\', '/')
+                        if '/lib/' not in _fn or _fn.endswith('/LLVMCG/BaseGen.py'):
+                            continue
+                        _Sites.append(f"{_fn.split('/lib/', 1)[-1]}:{getattr(_fr, 'lineno', 0)}"
+                                      f"({getattr(_fr, 'name', '?')})")
+                        if len(_Sites) >= 3:
+                            break
+                    if _Sites:
+                        _MsgP += "\n  TPC 发射点（由内向外）: " + " ← ".join(_Sites)
+                except Exception:
+                    pass
                 raise FailFastError(_MsgP)
         return
     # 失败路径才导入：热路径（每次 gep/load/store）不承担导入开销，也避免循环导入。