View Compilation Error

0_0_36812997_17425.cpp: In function 'void work()':
0_0_36812997_17425.cpp:114:9: error: expected unqualified-id before '[' token
    auto [l,r]=getTangent(P(x,y));
         ^
0_0_36812997_17425.cpp:115:10: error: 'l' was not declared in this scope
    lt[k]=l,rt[k]=r;
          ^
0_0_36812997_17425.cpp:115:18: error: 'r' was not declared in this scope
    lt[k]=l,rt[k]=r;
                  ^