[−][src]Struct rustc::ty::ParamEnv
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)
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When type checking, we use the ParamEnv
to track
details about the set of where-clauses that are in scope at this
particular point.
Fields
caller_bounds: &'tcx List<Predicate<'tcx>>
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Obligations that the caller must satisfy. This is basically the set of bounds on the in-scope type parameters, translated into Obligations, and elaborated and normalized.
reveal: Reveal
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Typically, this is Reveal::UserFacing
, but during codegen we
want Reveal::All
-- note that this is always paired with an
empty environment. To get that, use ParamEnv::reveal()
.
Methods
impl<'tcx> ParamEnv<'tcx>
[src]
impl<'tcx> ParamEnv<'tcx>
pub fn can_type_implement_copy<'a>(
self,
tcx: TyCtxt<'a, 'tcx, 'tcx>,
self_type: Ty<'tcx>
) -> Result<(), CopyImplementationError<'tcx>>
[src]
pub fn can_type_implement_copy<'a>(
self,
tcx: TyCtxt<'a, 'tcx, 'tcx>,
self_type: Ty<'tcx>
) -> Result<(), CopyImplementationError<'tcx>>
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impl<'tcx> ParamEnv<'tcx>
[src]
impl<'tcx> ParamEnv<'tcx>
pub fn empty() -> Self
[src]
pub fn empty() -> Self
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Construct a trait environment suitable for contexts where
there are no where clauses in scope. Hidden types (like impl Trait
) are left hidden, so this is suitable for ordinary
type-checking.
pub fn reveal_all() -> Self
[src]
pub fn reveal_all() -> Self
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Construct a trait environment with no where clauses in scope
where the values of all impl Trait
and other hidden types
are revealed. This is suitable for monomorphized, post-typeck
environments like codegen or doing optimizations.
NB. If you want to have predicates in scope, use ParamEnv::new
,
or invoke param_env.with_reveal_all()
.
pub fn new(caller_bounds: &'tcx List<Predicate<'tcx>>, reveal: Reveal) -> Self
[src]
pub fn new(caller_bounds: &'tcx List<Predicate<'tcx>>, reveal: Reveal) -> Self
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Construct a trait environment with the given set of predicates.
pub fn with_reveal_all(self) -> Self
[src]
pub fn with_reveal_all(self) -> Self
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Returns a new parameter environment with the same clauses, but
which "reveals" the true results of projections in all cases
(even for associated types that are specializable). This is
the desired behavior during codegen and certain other special
contexts; normally though we want to use Reveal::UserFacing
,
which is the default.
pub fn without_caller_bounds(self) -> Self
[src]
pub fn without_caller_bounds(self) -> Self
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Returns this same environment but with no caller bounds.
pub fn and<T: TypeFoldable<'tcx>>(self, value: T) -> ParamEnvAnd<'tcx, T>
[src]
pub fn and<T: TypeFoldable<'tcx>>(self, value: T) -> ParamEnvAnd<'tcx, T>
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Creates a suitable environment in which to perform trait
queries on the given value. When type-checking, this is simply
the pair of the environment plus value. But when reveal is set to
All, then if value
does not reference any type parameters, we will
pair it with the empty environment. This improves caching and is generally
invisible.
NB: We preserve the environment when type-checking because it
is possible for the user to have wacky where-clauses like
where Box<u32>: Copy
, which are clearly never
satisfiable. We generally want to behave as if they were true,
although the surrounding function is never reachable.
Trait Implementations
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for ParamEnv<'tcx>
[src]
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for ParamEnv<'tcx>
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<'tcx> Key for ParamEnv<'tcx>
[src]
impl<'tcx> Key for ParamEnv<'tcx>
fn query_crate(&self) -> CrateNum
[src]
fn query_crate(&self) -> CrateNum
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Given an instance of this key, what crate is it referring to? This is used to find the provider. Read more
fn default_span(&self, _: TyCtxt) -> Span
[src]
fn default_span(&self, _: TyCtxt) -> Span
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In the event that a cycle occurs, if no explicit span has been given for a query with key self
, what span should we use? Read more
impl<'a, 'tcx> Lift<'tcx> for ParamEnv<'a>
[src]
impl<'a, 'tcx> Lift<'tcx> for ParamEnv<'a>
type Lifted = ParamEnv<'tcx>
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fn lift_to_tcx<'b, 'gcx>(
&self,
tcx: TyCtxt<'b, 'gcx, 'tcx>
) -> Option<Self::Lifted>
[src]
fn lift_to_tcx<'b, 'gcx>(
&self,
tcx: TyCtxt<'b, 'gcx, 'tcx>
) -> Option<Self::Lifted>
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impl<'tcx> TypeFoldable<'tcx> for ParamEnv<'tcx>
[src]
impl<'tcx> TypeFoldable<'tcx> for ParamEnv<'tcx>
fn super_fold_with<'gcx: 'tcx, V: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut V
) -> Self
[src]
fn super_fold_with<'gcx: 'tcx, V: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut V
) -> Self
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fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
[src]
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> 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_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
[src]
fn has_regions_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
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True if self
has any late-bound regions that are either bound by binder
or bound by some binder outside of binder
. If binder
is ty::INNERMOST
, this indicates whether there are any late-bound regions that appear free. Read more
fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool
[src]
fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool
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True if this self
has any regions that escape binder
(and hence are not bound by it). Read more
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. Read more
fn has_late_bound_regions(&self) -> bool
[src]
fn has_late_bound_regions(&self) -> bool
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True if there are any late-bound regions
fn visit_tys_shallow(
&self,
visit: impl FnMut(Ty<'tcx>) -> bool
) -> bool
[src]
fn visit_tys_shallow(
&self,
visit: impl FnMut(Ty<'tcx>) -> bool
) -> bool
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A visitor that does not recurse into types, works like fn walk_shallow
in Ty
.
impl<'tcx> Copy for ParamEnv<'tcx>
[src]
impl<'tcx> Copy for ParamEnv<'tcx>
impl<'tcx> Clone for ParamEnv<'tcx>
[src]
impl<'tcx> Clone for ParamEnv<'tcx>
fn clone(&self) -> ParamEnv<'tcx>
[src]
fn clone(&self) -> ParamEnv<'tcx>
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<'tcx> Debug for ParamEnv<'tcx>
[src]
impl<'tcx> Debug for ParamEnv<'tcx>
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<'tcx> PartialEq for ParamEnv<'tcx>
[src]
impl<'tcx> PartialEq for ParamEnv<'tcx>
fn eq(&self, other: &ParamEnv<'tcx>) -> bool
[src]
fn eq(&self, other: &ParamEnv<'tcx>) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &ParamEnv<'tcx>) -> bool
[src]
fn ne(&self, other: &ParamEnv<'tcx>) -> bool
This method tests for !=
.
impl<'tcx> Eq for ParamEnv<'tcx>
[src]
impl<'tcx> Eq for ParamEnv<'tcx>
fn assert_receiver_is_total_eq(&self)
[src]
fn assert_receiver_is_total_eq(&self)
impl<'tcx> Hash for ParamEnv<'tcx>
[src]
impl<'tcx> Hash for ParamEnv<'tcx>
Auto Trait Implementations
Blanket Implementations
impl<T> MaybeResult for T
[src]
impl<T> MaybeResult for T
fn from_ok(T) -> T
[src]
fn from_ok(T) -> T
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fn map_same<F>(Self, F) -> T where
F: FnOnce(T) -> T,
[src]
fn map_same<F>(Self, F) -> T where
F: FnOnce(T) -> T,
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impl<'tcx, T> Subst for T where
T: TypeFoldable<'tcx>,
[src]
impl<'tcx, T> Subst for T where
T: TypeFoldable<'tcx>,
fn subst_spanned(
&Self,
TyCtxt<'a, 'gcx, 'tcx>,
&[Kind<'tcx>],
Option<Span>
) -> T
[src]
fn subst_spanned(
&Self,
TyCtxt<'a, 'gcx, 'tcx>,
&[Kind<'tcx>],
Option<Span>
) -> T
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fn subst<'a, 'gcx>(
&self,
tcx: TyCtxt<'a, 'gcx, 'tcx>,
substs: &[Kind<'tcx>]
) -> Self
[src]
fn subst<'a, 'gcx>(
&self,
tcx: TyCtxt<'a, 'gcx, 'tcx>,
substs: &[Kind<'tcx>]
) -> Self
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impl<'a, T> Captures for T where
T: ?Sized,
[src]
impl<'a, T> Captures for T where
T: ?Sized,
impl<T> ToOwned for T where
T: Clone,
[src]
impl<T> ToOwned for T where
T: Clone,
type Owned = T
fn to_owned(&self) -> T
[src]
fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
fn clone_into(&self, target: &mut T)
[src]
fn clone_into(&self, target: &mut T)
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
impl<T> From for T
[src]
impl<T> From for T
impl<T, U> Into for T where
U: From<T>,
[src]
impl<T, U> Into for T where
U: From<T>,
impl<T, U> TryFrom for T where
T: From<U>,
[src]
impl<T, U> TryFrom for T where
T: From<U>,
type Error = !
try_from
)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
[src]
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
try_from
)Performs the conversion.
impl<T> Borrow for T where
T: ?Sized,
[src]
impl<T> Borrow for T where
T: ?Sized,
ⓘImportant traits for &'a mut Rfn borrow(&self) -> &T
[src]
fn borrow(&self) -> &T
Immutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>,
[src]
impl<T, U> TryInto for T where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
try_from
)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
[src]
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
try_from
)Performs the conversion.
impl<T> BorrowMut for T where
T: ?Sized,
[src]
impl<T> BorrowMut for T where
T: ?Sized,
ⓘImportant traits for &'a mut Rfn borrow_mut(&mut self) -> &mut T
[src]
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T> Any for T where
T: 'static + ?Sized,
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impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId
[src]
fn get_type_id(&self) -> TypeId
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
Gets the TypeId
of self
. Read more
impl<E> SpecializationError for E
[src]
impl<E> SpecializationError for E
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized,
[src]
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized,
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S
is the encoder/decoder state type, T
is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more
impl<T> Erased for T
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impl<T> Erased for T
impl<T> Send for T where
T: ?Sized,
[src]
impl<T> Send for T where
T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
[src]
impl<T> Sync for T where
T: ?Sized,
impl<T> Erased for T
impl<T> Erased for T