[−][src]Struct rustc_mir::borrow_check::nll::type_check::relate_tys::TypeGeneralizer
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The "type generalize" is used when handling inference variables.
The basic strategy for handling a constraint like ?A <: B
is to
apply a "generalization strategy" to the type B
-- this replaces
all the lifetimes in the type B
with fresh inference
variables. (You can read more about the strategy in this blog
post.)
As an example, if we had ?A <: &'x u32
, we would generalize &'x u32
to &'0 u32
where '0
is a fresh variable. This becomes the
value of A
. Finally, we relate &'0 u32 <: &'x u32
, which
establishes '0: 'x
as a constraint.
As a side-effect of this generalization procedure, we also replace all the bound regions that we have traversed with concrete values, so that the resulting generalized type is independent from the scopes.
Fields
type_rel: &'me TypeRelating<'me, 'bccx, 'gcx, 'tcx>
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ambient_variance: Variance
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After we generalize this type, we are going to relative it to some other type. What will be the variance at this point?
first_free_index: DebruijnIndex
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universe: UniverseIndex
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Trait Implementations
impl<'me, 'gcx, 'tcx, 'bbcx> TypeRelation<'me, 'gcx, 'tcx> for TypeGeneralizer<'me, 'bbcx, 'gcx, 'tcx>
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impl<'me, 'gcx, 'tcx, 'bbcx> TypeRelation<'me, 'gcx, 'tcx> for TypeGeneralizer<'me, 'bbcx, 'gcx, 'tcx>
fn tcx(&self) -> TyCtxt<'me, 'gcx, 'tcx>
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fn tcx(&self) -> TyCtxt<'me, 'gcx, 'tcx>
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fn tag(&self) -> &'static str
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fn tag(&self) -> &'static str
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Returns a static string we can use for printouts.
fn a_is_expected(&self) -> bool
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fn a_is_expected(&self) -> bool
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Returns true if the value a
is the "expected" type in the relation. Just affects error messages. Read more
fn relate_with_variance<T: Relate<'tcx>>(
&mut self,
variance: Variance,
a: &T,
b: &T
) -> RelateResult<'tcx, T>
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fn relate_with_variance<T: Relate<'tcx>>(
&mut self,
variance: Variance,
a: &T,
b: &T
) -> RelateResult<'tcx, T>
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Switch variance for the purpose of relating a
and b
.
fn tys(&mut self, a: Ty<'tcx>, _: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>>
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fn tys(&mut self, a: Ty<'tcx>, _: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>>
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fn regions(
&mut self,
a: Region<'tcx>,
_: Region<'tcx>
) -> RelateResult<'tcx, Region<'tcx>>
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fn regions(
&mut self,
a: Region<'tcx>,
_: Region<'tcx>
) -> RelateResult<'tcx, Region<'tcx>>
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fn binders<T>(
&mut self,
a: &Binder<T>,
_: &Binder<T>
) -> RelateResult<'tcx, Binder<T>> where
T: Relate<'tcx>,
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fn binders<T>(
&mut self,
a: &Binder<T>,
_: &Binder<T>
) -> RelateResult<'tcx, Binder<T>> where
T: Relate<'tcx>,
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fn with_cause<F, R>(&mut self, _cause: Cause, f: F) -> R where
F: FnOnce(&mut Self) -> R,
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fn with_cause<F, R>(&mut self, _cause: Cause, f: F) -> R where
F: FnOnce(&mut Self) -> R,
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fn relate<T>(&mut self, a: &T, b: &T) -> Result<T, TypeError<'tcx>> where
T: Relate<'tcx>,
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fn relate<T>(&mut self, a: &T, b: &T) -> Result<T, TypeError<'tcx>> where
T: Relate<'tcx>,
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Generic relation routine suitable for most anything.
fn relate_item_substs(
&mut self,
item_def_id: DefId,
a_subst: &'tcx List<Kind<'tcx>>,
b_subst: &'tcx List<Kind<'tcx>>
) -> Result<&'tcx List<Kind<'tcx>>, TypeError<'tcx>>
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fn relate_item_substs(
&mut self,
item_def_id: DefId,
a_subst: &'tcx List<Kind<'tcx>>,
b_subst: &'tcx List<Kind<'tcx>>
) -> Result<&'tcx List<Kind<'tcx>>, TypeError<'tcx>>
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Relate the two substitutions for the given item. The default is to look up the variance for the item and proceed accordingly. Read more
Auto Trait Implementations
impl<'me, 'bccx, 'gcx, 'tcx> !Send for TypeGeneralizer<'me, 'bccx, 'gcx, 'tcx>
impl<'me, 'bccx, 'gcx, 'tcx> !Send for TypeGeneralizer<'me, 'bccx, 'gcx, 'tcx>
impl<'me, 'bccx, 'gcx, 'tcx> !Sync for TypeGeneralizer<'me, 'bccx, 'gcx, 'tcx>
impl<'me, 'bccx, 'gcx, 'tcx> !Sync for TypeGeneralizer<'me, 'bccx, 'gcx, 'tcx>
Blanket Implementations
impl<T> From for T
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impl<T> From for T
impl<T, U> Into for T where
U: From<T>,
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impl<T, U> Into for T where
U: From<T>,
impl<T, U> TryFrom for T where
T: From<U>,
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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>
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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,
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impl<T> Borrow for T where
T: ?Sized,
ⓘImportant traits for &'a mut Rfn borrow(&self) -> &T
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fn borrow(&self) -> &T
Immutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>,
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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>
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
try_from
)Performs the conversion.
impl<T> BorrowMut for T where
T: ?Sized,
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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
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fn get_type_id(&self) -> TypeId
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)
this method will likely be replaced by an associated static
Gets the TypeId
of self
. Read more
impl<E> SpecializationError for E
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impl<E> SpecializationError for E
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized,
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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,
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impl<T> Send for T where
T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
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impl<T> Sync for T where
T: ?Sized,
impl<T> Erased for T
impl<T> Erased for T
impl<T> MaybeResult for T
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impl<T> MaybeResult for T
fn from_ok(x: T) -> T
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fn from_ok(x: T) -> T
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fn map_same<F>(self, f: F) -> T where
F: FnOnce(T) -> T,
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fn map_same<F>(self, f: F) -> T where
F: FnOnce(T) -> T,
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impl<'a, T> Captures for T where
T: ?Sized,
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impl<'a, T> Captures for T where
T: ?Sized,