/in/foo.c:1:1: error: unknown type name 'def'
    1 | def fibonacci_sequence():
      | ^~~
/in/foo.c: In function 'fibonacci_sequence':
/in/foo.c:1:25: error: expected declaration specifiers before ':' token
    1 | def fibonacci_sequence():
      |                         ^
/in/foo.c:10:7: error: invalid preprocessing directive #\U00008ba1\U00007b97\U00006570\U00005217\U0000548c
   10 |     # 计算数列和
      |       ^~~~~~~~~~
/in/foo.c:17: warning: control reaches end of non-void function [-Wreturn-type]