View Compilation Error

0_0_25890498_1746.cpp:32:5: error: '__always_inline' does not name a type
     __always_inline mat operator*(const mat &x) const
     ^
0_0_25890498_1746.cpp:42:1: error: '__always_inline' does not name a type
 __always_inline mat fast(mat x, ll n)
 ^
0_0_25890498_1746.cpp: In function 'int main()':
0_0_25890498_1746.cpp:74:36: error: 'fast' was not declared in this scope
             tp = fast(tp, j - i + 1);
                                    ^