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Auto merge of #108112 - nnethercote:clarify-iterator-interners, r=oli-obk,compiler-errors

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Clarify iterator interners

I found the iterator interners very confusing. This PR clarifies things.

r? `@compiler-errors`
This commit is contained in:
bors 2023-02-18 00:20:52 +00:00
commit a9842c73bc
36 changed files with 173 additions and 186 deletions
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2
compiler/rustc_trait_selection/src/traits/project.rs
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@ -1923,7 +1923,7 @@ fn confirm_builtin_candidate<'cx, 'tcx>(
) -> Progress<'tcx> {
let tcx = selcx.tcx();
let self_ty = obligation.predicate.self_ty();
let substs = tcx.mk_substs([self_ty.into()].iter());
let substs = tcx.intern_substs(&[self_ty.into()]);
let lang_items = tcx.lang_items();
let item_def_id = obligation.predicate.def_id;
let trait_def_id = tcx.trait_of_item(item_def_id).unwrap();