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fix: reorder dyn bounds on render
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3a69435af7
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2 changed files with 33 additions and 1 deletions
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@ -751,9 +751,19 @@ impl HirDisplay for Ty {
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}
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TyKind::BoundVar(idx) => idx.hir_fmt(f)?,
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TyKind::Dyn(dyn_ty) => {
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// Reorder bounds to satisfy `write_bounds_like_dyn_trait()`'s expectation.
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// FIXME: `Iterator::partition_in_place()` or `Vec::drain_filter()` may make it
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// more efficient when either of them hits stable.
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let mut bounds: SmallVec<[_; 4]> =
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dyn_ty.bounds.skip_binders().iter(Interner).cloned().collect();
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let (auto_traits, others): (SmallVec<[_; 4]>, _) =
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bounds.drain(1..).partition(|b| b.skip_binders().trait_id().is_some());
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bounds.extend(others);
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bounds.extend(auto_traits);
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write_bounds_like_dyn_trait_with_prefix(
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"dyn",
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dyn_ty.bounds.skip_binders().interned(),
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&bounds,
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SizedByDefault::NotSized,
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f,
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)?;
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