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"access to extern crates through prelude is experimental" in rustdoc #51449

@goffrie

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@goffrie

Current rustdoc nightly errors when trying to document h2-0.1.9:

error[E0658]: access to extern crates through prelude is experimental (see issue #44660)
  |
  = help: add #![feature(extern_prelude)] to the crate attributes to enable

Annoyingly, I can't actually figure out what triggers the error. But it's a regression from stable.

Ref #44660.

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    T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.

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