Address the problem with OrdEq discovered during #1600

[otrho]

There are a couple of notes in the PR #1600 which mustn't be forgotten.

[mohammadfawaz]

Closing in favour of #1682

@otrho are there other issues here that need to be addressed other than the bogus dead code warnings?

[adlerjohn]

@mohammadfawaz yes, this one #1600 (comment)

[mohammadfawaz]

Ah perfect.

Referring to:

sway/sway-lib-std/src/u128.sw

Line 48 in ab4a505

// TODO this doesn't work?

Uncommenting the above leads to the following error:

error
  --> sway-lib-std/src/u128.sw:49:1
   |
47 |   
48 |   // TODO this doesn't work?
49 | / impl core::ops::OrdEq for U128 {
50 | | }
   | |_^ The trait "Ord" is not implemented for type "struct U128<u64, u64>"
51 |   
52 |   fn disable_overflow() {
   |

[mohammadfawaz]

Have we decided that this is blocked by the declarations engine? Marking as blocked for now.