View Compilation Error

0_0_33510701_17708.cpp: In function 'bool operator<(Huffman_trie, Huffman_trie)':
0_0_33510701_17708.cpp:15:5: error: named return values are no longer supported
     return a.freq>b.freq;
     ^
0_0_33510701_17708.cpp:15:21: error: expected '{' at end of input
     return a.freq>b.freq;
                     ^