Revert "Rollup merge of #92006 - oli-obk:welcome_opaque_types_into_th…#92928

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matthiaskrgr wants to merge 1 commit intorust-lang:masterfrom matthiaskrgr:rev_92006

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Commits on Jan 15, 2022

Revert "Rollup merge of rust-lang#92006 - oli-obk:welcome_opaque_types_into_the_fold, r=nikomatsakis"
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