diff options
Diffstat (limited to 'compiler/rustc_middle/src/ty/subst.rs')
| -rw-r--r-- | compiler/rustc_middle/src/ty/subst.rs | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/ty/subst.rs b/compiler/rustc_middle/src/ty/subst.rs index 43f95635ab0..8691a3070bc 100644 --- a/compiler/rustc_middle/src/ty/subst.rs +++ b/compiler/rustc_middle/src/ty/subst.rs @@ -538,13 +538,17 @@ impl<'tcx, T: TypeVisitable<TyCtxt<'tcx>>> TypeVisitable<TyCtxt<'tcx>> for &'tcx /// [`subst_identity`](EarlyBinder::subst_identity) or [`skip_binder`](EarlyBinder::skip_binder). #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)] #[derive(Encodable, Decodable, HashStable)] -pub struct EarlyBinder<T>(pub T); +pub struct EarlyBinder<T>(T); /// For early binders, you should first call `subst` before using any visitors. impl<'tcx, T> !TypeFoldable<TyCtxt<'tcx>> for ty::EarlyBinder<T> {} impl<'tcx, T> !TypeVisitable<TyCtxt<'tcx>> for ty::EarlyBinder<T> {} impl<T> EarlyBinder<T> { + pub fn new(inner: T) -> EarlyBinder<T> { + EarlyBinder(inner) + } + pub fn as_ref(&self) -> EarlyBinder<&T> { EarlyBinder(&self.0) } @@ -582,6 +586,9 @@ impl<T> EarlyBinder<T> { /// arguments of an `FnSig`). Otherwise, consider using /// [`subst_identity`](EarlyBinder::subst_identity). /// + /// To skip the binder on `x: &EarlyBinder<T>` to obtain `&T`, leverage + /// [`EarlyBinder::as_ref`](EarlyBinder::as_ref): `x.as_ref().skip_binder()`. + /// /// See also [`Binder::skip_binder`](super::Binder::skip_binder), which is /// the analogous operation on [`super::Binder`]. pub fn skip_binder(self) -> T { |