Investigate failing Pallet UI tests

[ggwpez]

The pallet UI tests sometimes fail with just one line of diff. It often looks like this:

@@ -28,7 +28,7 @@ error[E0277]: the trait bound `Bar: EncodeLike` is not satisfied
              <&[(T,)] as EncodeLike<BinaryHeap<LikeT>>>
              <&[(T,)] as EncodeLike<LinkedList<LikeT>>>
              <&[T] as EncodeLike<Vec<U>>>
-           and 278 others
+           and 279 others
    = note: required for `Bar` to implement `FullEncode`
    = note: required for `Bar` to implement `FullCodec`
    = note: required for `frame_support::pallet_prelude::StorageValue<_GeneratedPrefixForStorageFoo<T>, Bar>` to implement `PartialStorageInfoTrait`

Example include #12485 and #12537 (search for pallet_ui in the files).
No idea what is causing this, but I had it at least three times now.

[bkchr]

Hmm and how did you solve these errors? Did you rerun the tests with TRYBUILD=overwrite?

[ggwpez]

Did you rerun the tests with TRYBUILD=overwrite?

Yes it was "solved" with your update-rust-stable.sh script.

[bkchr]

Looks like that the number between both tests increased by one. So, maybe some new type that is implemented in these prs that make this number go up? Which is clearly annoying.

[hirschenberger]

I did some research and this seems to be resolved in trybuild since 1.0.70 with dtolnay/trybuild#198.
I think an update may solve the issue.