/in/foo.c: In function 'main':
/in/foo.c:19:5: error: unknown type name '\U0000ff09'
   19 |     ）
      |     ^~
/in/foo.c:20:12: error: expected declaration specifiers or '...' before string constant
   20 |     printf("%lld ", f1);
      |            ^~~~~~~
/in/foo.c:20:21: error: expected declaration specifiers or '...' before 'f1'
   20 |     printf("%lld ", f1);
      |                     ^~