View Compilation Error

0_0_29452204_18403.cpp: In function 'bool Witness(long long int, long long int)':
0_0_29452204_18403.cpp:37:26: error: 'tr' was not declared in this scope
     if (x_0 != 1) return tr
                          ^
0_0_29452204_18403.cpp:37:26: error: expected ';' at end of input
0_0_29452204_18403.cpp:37:26: error: expected '}' at end of input