View Compilation Error

0_0_34488799_17756.cpp: In function 'int32_t main()':
0_0_34488799_17756.cpp:158:34: error: expected unqualified-id before '[' token
                         for (auto[x, y] : back) {
                                  ^
0_0_34488799_17756.cpp:158:34: error: expected ';' before '[' token
0_0_34488799_17756.cpp:158:35: error: 'x' was not declared in this scope
                         for (auto[x, y] : back) {
                                   ^
0_0_34488799_17756.cpp:158:38: error: 'y' was not declared in this scope
                         for (auto[x, y] : back) {
                                      ^
0_0_34488799_17756.cpp: In lambda function:
0_0_34488799_17756.cpp:158:41: error: expected '{' before ':' token
                         for (auto[x, y] : back) {
                                         ^
0_0_34488799_17756.cpp: In function 'int32_t main()':
0_0_34488799_17756.cpp:158:41: error: expected ';' before ':' token
0_0_34488799_17756.cpp:158:41: error: expected primary-expression before ':' token
0_0_34488799_17756.cpp:158:41: error: expected ')' before ':' token
0_0_34488799_17756.cpp:158:41: error: expected primary-expression before ':' token