View Compilation Error

0_0_22337135_14698.cpp: In member function 'int Tire::idx(char)':
0_0_22337135_14698.cpp:14:21: error: named return values are no longer supported
     int idx(char x) return x - 'a';
                     ^
0_0_22337135_14698.cpp:14:32: error: expected '{' at end of input
     int idx(char x) return x - 'a';
                                ^