/in/foo.cc: In function 'int check()':
/in/foo.cc:5:20: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define FOR(i,j,k) for(register int i=j; i<=k; ++i)
                    ^
/in/foo.cc:17:2: note: in expansion of macro 'FOR'
  FOR(i,0,m) f[i] = 0; f[0] = 1;
  ^~~
/in/foo.cc:17:23: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  FOR(i,0,m) f[i] = 0; f[0] = 1;
                       ^