Enum rustc::traits::project::Reveal [−][src]
pub enum Reveal { UserFacing, All, }
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Depending on the stage of compilation, we want projection to be more or less conservative.
Variants
UserFacing
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At type-checking time, we refuse to project any associated
type that is marked default
. Non-default
("final") types
are always projected. This is necessary in general for
soundness of specialization. However, we could allow
projections in fully-monomorphic cases. We choose not to,
because we prefer for default type
to force the type
definition to be treated abstractly by any consumers of the
impl. Concretely, that means that the following example will
fail to compile:
trait Assoc { type Output; } impl<T> Assoc for T { default type Output = bool; } fn main() { let <() as Assoc>::Output = true; }
All
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At trans time, all monomorphic projections will succeed.
Also, impl Trait
is normalized to the concrete type,
which has to be already collected by type-checking.
NOTE: As impl Trait
's concrete type should never
be observable directly by the user, Reveal::All
should not be used by checks which may expose
type equality or type contents to the user.
There are some exceptions, e.g. around OIBITS and
transmute-checking, which expose some details, but
not the whole concrete type of the impl Trait
.
Trait Implementations
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Reveal
[src]
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Reveal
fn hash_stable<W: StableHasherResult>(
&self,
__ctx: &mut StableHashingContext<'a>,
__hasher: &mut StableHasher<W>
)
[src]
fn hash_stable<W: StableHasherResult>(
&self,
__ctx: &mut StableHashingContext<'a>,
__hasher: &mut StableHasher<W>
)
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impl Debug for Reveal
[src]
impl Debug for Reveal
fn fmt(&self, f: &mut Formatter) -> Result
[src]
fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl Copy for Reveal
[src]
impl Copy for Reveal
impl Clone for Reveal
[src]
impl Clone for Reveal
fn clone(&self) -> Reveal
[src]
fn clone(&self) -> Reveal
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl PartialEq for Reveal
[src]
impl PartialEq for Reveal
fn eq(&self, other: &Reveal) -> bool
[src]
fn eq(&self, other: &Reveal) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
fn ne(&self, other: &Rhs) -> bool
This method tests for !=
.
impl Eq for Reveal
[src]
impl Eq for Reveal
fn assert_receiver_is_total_eq(&self)
[src]
fn assert_receiver_is_total_eq(&self)
impl Hash for Reveal
[src]
impl Hash for Reveal
fn hash<__H: Hasher>(&self, state: &mut __H)
[src]
fn hash<__H: Hasher>(&self, state: &mut __H)
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl<'tcx> TypeFoldable<'tcx> for Reveal
[src]
impl<'tcx> TypeFoldable<'tcx> for Reveal
fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
_: &mut F
) -> Reveal
[src]
fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
_: &mut F
) -> Reveal
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fn super_visit_with<F: TypeVisitor<'tcx>>(&self, _: &mut F) -> bool
[src]
fn super_visit_with<F: TypeVisitor<'tcx>>(&self, _: &mut F) -> bool
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fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut F
) -> Self
[src]
fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut F
) -> Self
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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
[src]
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
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fn has_regions_escaping_depth(&self, depth: u32) -> bool
[src]
fn has_regions_escaping_depth(&self, depth: u32) -> bool
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fn has_escaping_regions(&self) -> bool
[src]
fn has_escaping_regions(&self) -> bool
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fn has_type_flags(&self, flags: TypeFlags) -> bool
[src]
fn has_type_flags(&self, flags: TypeFlags) -> bool
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fn has_projections(&self) -> bool
[src]
fn has_projections(&self) -> bool
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fn references_error(&self) -> bool
[src]
fn references_error(&self) -> bool
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fn has_param_types(&self) -> bool
[src]
fn has_param_types(&self) -> bool
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fn has_self_ty(&self) -> bool
[src]
fn has_self_ty(&self) -> bool
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fn has_infer_types(&self) -> bool
[src]
fn has_infer_types(&self) -> bool
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fn needs_infer(&self) -> bool
[src]
fn needs_infer(&self) -> bool
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fn has_skol(&self) -> bool
[src]
fn has_skol(&self) -> bool
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fn needs_subst(&self) -> bool
[src]
fn needs_subst(&self) -> bool
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fn has_re_skol(&self) -> bool
[src]
fn has_re_skol(&self) -> bool
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fn has_closure_types(&self) -> bool
[src]
fn has_closure_types(&self) -> bool
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fn has_free_regions(&self) -> bool
[src]
fn has_free_regions(&self) -> bool
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"Free" regions in this context means that it has any region that is not (a) erased or (b) late-bound. Read more
fn has_erasable_regions(&self) -> bool
[src]
fn has_erasable_regions(&self) -> bool
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True if there any any un-erased free regions.
fn is_global(&self) -> bool
[src]
fn is_global(&self) -> bool
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Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Errs on the side of returning false. Read more
impl<'tcx> Lift<'tcx> for Reveal
[src]
impl<'tcx> Lift<'tcx> for Reveal
type Lifted = Self
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fn lift_to_tcx<'a, 'gcx>(&self, _: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self>
[src]
fn lift_to_tcx<'a, 'gcx>(&self, _: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self>
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