pub struct DynTy<I: Interner> {
pub bounds: Binders<QuantifiedWhereClauses<I>>,
pub lifetime: Lifetime<I>,
}
Expand description
A “DynTy” represents a trait object (dyn Trait
). Trait objects
are conceptually very related to an “existential type” of the form
exists<T> { T: Trait }
(another example of such type is impl Trait
).
DynTy
represents the bounds on that type.
The “bounds” here represents the unknown self type. So, a type like
dyn for<'a> Fn(&'a u32)
would be represented with two-levels of
binder, as “depicted” here:
exists<type> {
vec![
// A QuantifiedWhereClause:
forall<region> { ^1.0: Fn(&^0.0 u32) }
]
}
The outer exists<type>
binder indicates that there exists
some type that meets the criteria within, but that type is not
known. It is referenced within the type using ^1.0
, indicating
a bound type with debruijn index 1 (i.e., skipping through one
level of binder).
Fields
bounds: Binders<QuantifiedWhereClauses<I>>
The unknown self type.
lifetime: Lifetime<I>
Lifetime of the DynTy
.
Trait Implementations
sourceimpl<I: Interner> HasInterner for DynTy<I>
impl<I: Interner> HasInterner for DynTy<I>
type Interner = I
type Interner = I
The interner associated with the type.
sourceimpl<I: Interner> TypeFoldable<I> for DynTy<I>
impl<I: Interner> TypeFoldable<I> for DynTy<I>
sourcefn fold_with<E>(
self,
folder: &mut dyn TypeFolder<I, Error = E>,
outer_binder: DebruijnIndex
) -> Result<Self, E>
fn fold_with<E>(
self,
folder: &mut dyn TypeFolder<I, Error = E>,
outer_binder: DebruijnIndex
) -> Result<Self, E>
Apply the given folder folder
to self
; binders
is the
number of binders that are in scope when beginning the
folder. Typically binders
starts as 0, but is adjusted when
we encounter Binders<T>
in the IR or other similar
constructs. Read more
sourceimpl<I: Interner> TypeVisitable<I> for DynTy<I>
impl<I: Interner> TypeVisitable<I> for DynTy<I>
sourcefn visit_with<B>(
&self,
visitor: &mut dyn TypeVisitor<I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B>
fn visit_with<B>(
&self,
visitor: &mut dyn TypeVisitor<I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B>
Apply the given visitor visitor
to self
; binders
is the
number of binders that are in scope when beginning the
visitor. Typically binders
starts as 0, but is adjusted when
we encounter Binders<T>
in the IR or other similar
constructs. Read more
impl<I: Interner> Copy for DynTy<I> where
I::InternedLifetime: Copy,
I::InternedQuantifiedWhereClauses: Copy,
I::InternedVariableKinds: Copy,
impl<I: Eq + Interner> Eq for DynTy<I>
impl<I: Interner> StructuralEq for DynTy<I>
impl<I: Interner> StructuralPartialEq for DynTy<I>
Auto Trait Implementations
impl<I> RefUnwindSafe for DynTy<I> where
<I as Interner>::InternedLifetime: RefUnwindSafe,
<I as Interner>::InternedQuantifiedWhereClauses: RefUnwindSafe,
<I as Interner>::InternedVariableKinds: RefUnwindSafe,
impl<I> Send for DynTy<I> where
<I as Interner>::InternedLifetime: Send,
<I as Interner>::InternedQuantifiedWhereClauses: Send,
<I as Interner>::InternedVariableKinds: Send,
impl<I> Sync for DynTy<I> where
<I as Interner>::InternedLifetime: Sync,
<I as Interner>::InternedQuantifiedWhereClauses: Sync,
<I as Interner>::InternedVariableKinds: Sync,
impl<I> Unpin for DynTy<I> where
<I as Interner>::InternedLifetime: Unpin,
<I as Interner>::InternedQuantifiedWhereClauses: Unpin,
<I as Interner>::InternedVariableKinds: Unpin,
impl<I> UnwindSafe for DynTy<I> where
<I as Interner>::InternedLifetime: UnwindSafe,
<I as Interner>::InternedQuantifiedWhereClauses: UnwindSafe,
<I as Interner>::InternedVariableKinds: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Cast for T
impl<T> Cast for T
sourcefn cast<U>(self, interner: U::Interner) -> U where
Self: CastTo<U>,
U: HasInterner,
fn cast<U>(self, interner: U::Interner) -> U where
Self: CastTo<U>,
U: HasInterner,
Cast a value to type U
using CastTo
.
sourceimpl<T, I> CouldMatch<T> for T where
T: Zip<I> + HasInterner<Interner = I> + ?Sized,
I: Interner,
impl<T, I> CouldMatch<T> for T where
T: Zip<I> + HasInterner<Interner = I> + ?Sized,
I: Interner,
sourcefn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &T
) -> bool
fn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &T
) -> bool
Checks whether self
and other
could possibly match.
sourceimpl<T, I> Shift<I> for T where
T: TypeFoldable<I>,
I: Interner,
impl<T, I> Shift<I> for T where
T: TypeFoldable<I>,
I: Interner,
sourcefn shifted_in(self, interner: I) -> T
fn shifted_in(self, interner: I) -> T
Shifts this term in one level of binders.
sourcefn shifted_in_from(self, interner: I, source_binder: DebruijnIndex) -> T
fn shifted_in_from(self, interner: I, source_binder: DebruijnIndex) -> T
Shifts a term valid at outer_binder
so that it is
valid at the innermost binder. See DebruijnIndex::shifted_in_from
for a detailed explanation. Read more
sourcefn shifted_out_to(
self,
interner: I,
target_binder: DebruijnIndex
) -> Result<T, NoSolution>
fn shifted_out_to(
self,
interner: I,
target_binder: DebruijnIndex
) -> Result<T, NoSolution>
Shifts a term valid at the innermost binder so that it is
valid at outer_binder
. See DebruijnIndex::shifted_out_to
for a detailed explanation. Read more
sourcefn shifted_out(self, interner: I) -> Result<T, NoSolution>
fn shifted_out(self, interner: I) -> Result<T, NoSolution>
Shifts this term out one level of binders.
sourceimpl<T, I> VisitExt<I> for T where
I: Interner,
T: TypeVisitable<I>,
impl<T, I> VisitExt<I> for T where
I: Interner,
T: TypeVisitable<I>,
sourcefn has_free_vars(&self, interner: I) -> bool
fn has_free_vars(&self, interner: I) -> bool
Check whether there are free (non-bound) variables.