def _first_fill_value_loc(self):
if len(self) == <NUM_LIT:0> or self.sp_index.npoints == len(self):<EOL><INDENT>return -<NUM_LIT:1><EOL><DEDENT>indices = self.sp_index.to_int_index().indices<EOL>if not len(indices) or indices[<NUM_LIT:0>] > <NUM_LIT:0>:<EOL><INDENT>return <NUM_LIT:0><EOL><DEDENT>diff = indices[<NUM_LIT:1>:] - indices[:-<NUM_LIT:1>]<EOL>return np.searchsorted(diff, <NUM_LIT:2>) + <NUM_LIT:1><EOL>
Get the location of the first missing value.

Returns
-------
int