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Resolve a FIXME

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This commit is contained in:
Oli Scherer 2022-09-15 13:37:34 +00:00
parent d4e986c1f0
commit 10c0560cd2
1 changed files with 4 additions and 8 deletions
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12
compiler/rustc_middle/src/ty/structural_impls.rs
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@ -246,7 +246,6 @@ TrivialTypeTraversalAndLiftImpls! {
///////////////////////////////////////////////////////////////////////////
// Lift implementations
// FIXME(eddyb) replace all the uses of `Option::map` with `?`.
impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>> Lift<'tcx> for (A, B) {
type Lifted = (A::Lifted, B::Lifted);
fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
@ -264,10 +263,7 @@ impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>, C: Lift<'tcx>> Lift<'tcx> for (A, B, C)
impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Option<T> {
type Lifted = Option<T::Lifted>;
fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
match self {
Some(x) => tcx.lift(x).map(Some),
None => Some(None),
}
tcx.lift(self?).map(Some)
}
}
@ -284,21 +280,21 @@ impl<'tcx, T: Lift<'tcx>, E: Lift<'tcx>> Lift<'tcx> for Result<T, E> {
impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Box<T> {
type Lifted = Box<T::Lifted>;
fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
tcx.lift(*self).map(Box::new)
Some(Box::new(tcx.lift(*self)?))
}
}
impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Rc<T> {
type Lifted = Rc<T::Lifted>;
fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
tcx.lift(self.as_ref().clone()).map(Rc::new)
Some(Rc::new(tcx.lift(self.as_ref().clone())?))
}
}
impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Arc<T> {
type Lifted = Arc<T::Lifted>;
fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
tcx.lift(self.as_ref().clone()).map(Arc::new)
Some(Arc::new(tcx.lift(self.as_ref().clone())?))
}
}
impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Vec<T> {