bjoernager/rust
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remove unnecessary sized checks

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This commit is contained in:
Lukas Markeffsky 2024-03-13 23:35:24 +01:00
parent 8ad94111ad
commit 8fe99f57a4
4 changed files with 15 additions and 11 deletions
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5
compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs
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@ -154,8 +154,9 @@ pub(in crate::solve) fn instantiate_constituent_tys_for_sized_trait<'tcx>(
bug!("unexpected type `{ty}`")
}
// impl Sized for (T1, T2, .., Tn) where T1: Sized, T2: Sized, .. Tn: Sized
ty::Tuple(tys) => Ok(tys.iter().map(ty::Binder::dummy).collect()),
// impl Sized for ()
// impl Sized for (T1, T2, .., Tn) where Tn: Sized if n >= 1
ty::Tuple(tys) => Ok(tys.last().map_or_else(Vec::new, |&ty| vec![ty::Binder::dummy(ty)])),
// impl Sized for Adt<Args...> where sized_constraint(Adt)<Args...>: Sized
// `sized_constraint(Adt)` is the deepest struct trail that can be determined