internal: update next-solver to 0.166

[ada4a]

A small PR to see if I'm doing things right.

This update seems to consist of just rust-lang/rust#156246, which changes Interner::for_each_{blanket,relevant}_impl to be able to early-return, using the VisitorResult type. My adaptation mostly involved:

• Replacing calls to .for_each with for-loops, to allow early-returning (.try_for_each unfortunately doesn't work, as VisitorResult isn't Try)
• Copying the ret! macro introduced in the upstream PR. Upstream only needs it in one place, while we need it in four, so I put it into next_solver/util.rs.

cc @ChayimFriedman2

[ChayimFriedman2]

I guess you deliberately didn't upgrade to the last version, to keep it small?

Thanks!

View changes since this review

[ada4a]

I guess you deliberately didn't upgrade to the last version, to keep it small?

That, but also because of the fact that, if I were to jump across multiple versions, I'd like to have a commit per version, but then I wouldn't be able to link the relevant PRs, because rustbot would complain...

[ChayimFriedman2]

You absolutely can put links in commit messages, you just need them to be full (rust-lang/rust#number or https://github.com/rust-lang/rust/issue/number).