View Compilation Error

0_0_37946748_22410.cpp: In function 'int main()':
0_0_37946748_22410.cpp:70:19: error: expected unqualified-id before '[' token
         for (auto [w, u] : a) {
                   ^
0_0_37946748_22410.cpp:70:19: error: expected ';' before '[' token
0_0_37946748_22410.cpp:70:20: error: 'w' was not declared in this scope
         for (auto [w, u] : a) {
                    ^
0_0_37946748_22410.cpp:70:23: error: 'u' was not declared in this scope
         for (auto [w, u] : a) {
                       ^
0_0_37946748_22410.cpp: In lambda function:
0_0_37946748_22410.cpp:70:26: error: expected '{' before ':' token
         for (auto [w, u] : a) {
                          ^
0_0_37946748_22410.cpp: In function 'int main()':
0_0_37946748_22410.cpp:70:26: error: expected ';' before ':' token
0_0_37946748_22410.cpp:70:26: error: expected primary-expression before ':' token
0_0_37946748_22410.cpp:70:26: error: expected ')' before ':' token
0_0_37946748_22410.cpp:70:26: error: expected primary-expression before ':' token