PR 3223 should be gated on the version number

[nrc]

No description provided.

[scampi]

@nrc what should be done to fix this ?

[topecongiro]

Ouch. I forgot about versioning thing when I merged it... 😭

@scampi We need to address the following things:

1. Gate this change on "version". Something like the following should be OK for now:

if config.version() == Version::One {
    // format in old way
} else {
    // format in new way
}

2. Add tests to check that semicolons are added only when version is set to Two.
3. (Optional) add "version" = "Two" to rustfmt.toml of this repo so that self-check uses the latest formatting.

[scampi]

@nrc @topecongiro sorry about that, i've been reading posts about rustfmt stabilisation but it didn't strike me either when writing the PR.
I'll fix this with the instructions above!