Test suites of xml-rs and quick-xml crates fails on 1.28 beta

[pietroalbini]

I think that's caused by a change in the debug repr, but I haven't bisected/checked.

• quick-xml regressed from stable to beta (build log) cc @tafia
• xml-rs regressed from stable to beta (build log) cc @tomaka

[tomaka]

cc @netvl

[Mark-Simulacrum]

65a16c0 -- #49283 -- cc @rust-lang/libs

Looks like an intentional change though.

[pietroalbini]

FYI, there was a similar regression in a past release (#47619), and this was the decision:

@sfackler - #47619 (comment)
We make zero guarantees as to what Debug implementations look like.

[SimonSapin]

This was indeed intentional, and I support the quoted comment about the lack of guarantee.

[Mark-Simulacrum]

Okay, I'm going to close as this isn't something we're going to fix.

[tafia]

Just fyi, quick-xml tests are no longer relying on Debug format. They all use Display only.