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Wrap some overlong comments.
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@ -880,16 +880,18 @@ fn analysis(tcx: TyCtxt<'_>, (): ()) -> Result<()> {
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let trait_ref = ty::Binder::dummy(ty::TraitRef::identity(tcx, tr));
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// A slightly edited version of the code in `rustc_trait_selection::traits::vtable::vtable_entries`,
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// that works without self type and just counts number of entries.
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// A slightly edited version of the code in
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// `rustc_trait_selection::traits::vtable::vtable_entries`, that works without self
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// type and just counts number of entries.
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//
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// Note that this is technically wrong, for traits which have associated types in supertraits:
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// Note that this is technically wrong, for traits which have associated types in
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// supertraits:
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//
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// trait A: AsRef<Self::T> + AsRef<()> { type T; }
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//
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// Without self type we can't normalize `Self::T`, so we can't know if `AsRef<Self::T>` and
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// `AsRef<()>` are the same trait, thus we assume that those are different, and potentially
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// over-estimate how many vtable entries there are.
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// Without self type we can't normalize `Self::T`, so we can't know if `AsRef<Self::T>`
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// and `AsRef<()>` are the same trait, thus we assume that those are different, and
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// potentially over-estimate how many vtable entries there are.
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//
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// Similarly this is wrong for traits that have methods with possibly-impossible bounds.
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// For example:
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@ -916,10 +918,10 @@ fn analysis(tcx: TyCtxt<'_>, (): ()) -> Result<()> {
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let own_existential_entries =
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tcx.own_existential_vtable_entries(trait_ref.def_id());
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// The original code here ignores the method if its predicates are impossible.
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// We can't really do that as, for example, all not trivial bounds on generic
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// parameters are impossible (since we don't know the parameters...),
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// see the comment above.
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// The original code here ignores the method if its predicates are
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// impossible. We can't really do that as, for example, all not trivial
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// bounds on generic parameters are impossible (since we don't know the
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// parameters...), see the comment above.
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entries_ignoring_upcasting += own_existential_entries.len();
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if emit_vptr {
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