79   static constexpr uptr kUnusedBits = 11;  member
80   static_assert(kCompressedAddrBits + kUnusedBits + 9 == 64,
89   u64 _ : kUnusedBits;
118   static constexpr uptr kUnusedBits = 3;  member
121   static_assert(kCompressedAddrBits + kStackIDHiBits + kUnusedBits == 64,
130   u64 _ : kUnusedBits;
137   static constexpr uptr kUnusedBits = 15;  member
138   static_assert(kCompressedAddrBits + kUnusedBits + 5 == 64,
144   u64 _ : kUnusedBits;
151   static constexpr uptr kUnusedBits = 37;  member
152   static_assert(kUnusedBits + sizeof(Sid) * kByteBits + kEpochBits + 5 == 64,
160   u64 _ : kUnusedBits;