[clang] [Clang][Sema]: Allow copy constructor side effects (PR #81127)

[Vlad Serebrennikov via cfe-commits]

================
@@ -1,5 +1,5 @@
 // RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-label -Wno-c++1y-extensions -verify %s
-// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-label -Wno-c++1y-extensions -verify -std=gnu++11 %s
+// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-label -Wno-c++1y-extensions -verify -std=gnu++17 %s
----------------
Endilll wrote:

If you need to run this test in C++17 mode, better add it, instead of replacing C++11 mode.

https://github.com/llvm/llvm-project/pull/81127