why has code Self::FIELD_COUNT == 0 is always false, because Self::FIELD_COUNT is const and always 3

[sjatsh]

[zhangsoledad]

It looks like it should be self.field_count()， @yangby-cryptape

[yangby-cryptape]

This piece of code is correct, but it could be optimized off in the code generator.

The condition slice_len == 4 is satisfied if and only if when the table is defined with no fields.

• If u define a empty table, such as:

  table EmptyTable {}

  If slice_len == 4, it could return a Ok(_).

• But if a table has at least 1 field, it has to return an Err(_).