For example, oplog_entry.idl produces code that looks like this:

const std::int64_t getVersion() const { return _version; }

Coverity is flagging all of these with:
CID 101615 (#1 of 1): Parse warning (PW.USELESS_TYPE_QUALIFIER_ON_RETURN_TYPE)
1. useless_type_qualifier_on_return_type: type qualifier on return type is meaningless