Intermediate changes

commit_hash:86194fc61838b6eca04dee924d646ca679907fbc

Author: robot-piglet

util/generic/yexception_ut.cpp

@@ -11,6 +11,7 @@ static inline void Throw2DontMove() {
 #include <library/cpp/testing/unittest/registar.h>
 
 #include <util/generic/algorithm.h>
+#include <util/generic/scope.h>
 #include <util/memory/tempbuf.h>
 #include <util/random/mersenne.h>
 #include <util/stream/output.h>
@@ -159,7 +160,10 @@ class TExceptionTest: public TTestBase {
         auto invalidFormatter = [](IOutputStream*, void* const*, size_t) {
             Throw2DontMove();
         };
-        SetFormatBackTraceFn(invalidFormatter);
+        TFormatBackTraceFn prevFn = SetFormatBackTraceFn(invalidFormatter);
+        Y_DEFER {
+            SetFormatBackTraceFn(prevFn);
+        };
 
         try {
             Throw1DontMove();