修复了关于 snprintf 的错误（不支持长度推导）

lib/core/Handles/HandlesMatch.py

@@ -129,6 +129,34 @@ class MatchHandle(BaseHandle):
             elif isinstance(pattern, ast.MatchSequence):
                 HasDefault = True
                 CaseBBs.append(DefaultBB)
+            elif isinstance(pattern, ast.MatchClass):
+                # 兜底处理：REnum 检测失败但 case 是 MatchClass（REnum 变体模式）
+                # 尝试从变体名查找 tag 值，按整数值处理
+                cls_node_mc: ast.expr = pattern.cls
+                VariantName_mc: str | None = None
+                QualifiedName_mc: str | None = None
+                if isinstance(cls_node_mc, ast.Name):
+                    VariantName_mc = cls_node_mc.id
+                elif isinstance(cls_node_mc, ast.Attribute):
+                    VariantName_mc = cls_node_mc.attr
+                    if isinstance(cls_node_mc.value, ast.Attribute):
+                        QualifiedName_mc = f"{cls_node_mc.value.attr}.{VariantName_mc}"
+                    elif isinstance(cls_node_mc.value, ast.Name):
+                        QualifiedName_mc = f"{cls_node_mc.value.id}.{VariantName_mc}"
+                TagValue_mc: int | None = None
+                SymInfo_mc: "SymbolTable.SymbolInfo" = None
+                if QualifiedName_mc:
+                    SymInfo_mc = self.Trans.SymbolTable.lookup(QualifiedName_mc)
+                if not (SymInfo_mc and SymInfo_mc.IsEnumMember):
+                    SymInfo_mc = self.Trans.SymbolTable.lookup(VariantName_mc)
+                if SymInfo_mc and SymInfo_mc.IsEnumMember:
+                    TagValue_mc = SymInfo_mc.value
+                if TagValue_mc is not None:
+                    CaseValues.append(ir.Constant(SwitchIntType, TagValue_mc))
+                    CaseBBs.append(Gen.func.append_basic_block(name=f"match.case_{VariantName_mc}"))
+                else:
+                    # 变体名未找到，跳过此 case（fast-fail 已在外层处理）
+                    pass
             def _HasNoBreak(stmts: list[ast.stmt]) -> bool:
                 for stmt in stmts:
                     if isinstance(stmt, ast.Expr) and isinstance(stmt.value, ast.Call):
@@ -187,6 +215,16 @@ class MatchHandle(BaseHandle):
                     if not HasNoBreak[i]:
                         Gen.builder.branch(AfterBB)
                 CaseIdx += 1
+            elif isinstance(pattern, ast.MatchClass):
+                # 兜底处理：MatchClass 在非 REnum 路径的 case body 生成
+                # case 收集阶段已创建 CaseBB，此处生成 body
+                if CaseIdx < len(CaseBBs) and CaseBBs[CaseIdx] != DefaultBB:
+                    Gen.builder.position_at_start(CaseBBs[CaseIdx])
+                    self.HandleBodyLlvm(case.body)
+                    if not Gen.builder.block.is_terminated:
+                        if not HasNoBreak[i]:
+                            Gen.builder.branch(AfterBB)
+                    CaseIdx += 1
         if not HasDefault:
             Gen.builder.position_at_start(DefaultBB)
             Gen.builder.branch(AfterBB)