Rustdoc Json Tests: Don't assume that core::fmt::Debug will always have one item. #105063
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See #104525 (comment) and #104525 (comment) for motivation.
This still assumes that
fmtis the first method, but thats alot less brittle than assuming it will be the only method.Sadly, we can't use a aux crate to insulate the tests from core changes, because core is special, so all we can do is try not to depend on things that may change.