Struct chalk_ir::fold::Subst [−][src]
pub struct Subst<'s, 'i, I: Interner> { /* fields omitted */ }
Expand description
Substitution used during folding
Implementations
Trait Implementations
impl<'i, I: Interner> Folder<'i, I> for Subst<'_, 'i, I>
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impl<'i, I: Interner> Folder<'i, I> for Subst<'_, 'i, I>
[src]fn fold_free_var_ty(
&mut self,
bound_var: BoundVar,
outer_binder: DebruijnIndex
) -> Fallible<Ty<I>>
[src]
fn fold_free_var_ty(
&mut self,
bound_var: BoundVar,
outer_binder: DebruijnIndex
) -> Fallible<Ty<I>>
[src]We are eliminating one binder, but binders outside of that get preserved.
So e.g. consider this:
for<A, B> { for<C> { [A, C] } }
// ^ the binder we are substituing with `[u32]`
Here, A
would be ^1.0
and C
would be ^0.0
. We will replace ^0.0
with the
0th index from the list (u32
). We will convert ^1.0
(A) to ^0.0
– i.e., shift
it out of one level of binder (the for<C>
binder we are eliminating).
This gives us as a result:
for<A, B> { [A, u32] }
^ represented as `^0.0`
fn fold_free_var_lifetime(
&mut self,
bound_var: BoundVar,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
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fn fold_free_var_lifetime(
&mut self,
bound_var: BoundVar,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
[src]see fold_free_var_ty
fn fold_free_var_const(
&mut self,
ty: Ty<I>,
bound_var: BoundVar,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
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fn fold_free_var_const(
&mut self,
ty: Ty<I>,
bound_var: BoundVar,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
[src]see fold_free_var_ty
fn as_dyn(&mut self) -> &mut dyn Folder<'i, I>
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fn as_dyn(&mut self) -> &mut dyn Folder<'i, I>
[src]Creates a dyn
value from this folder. Unfortunately, this
must be added manually to each impl of Folder; it permits the
default implements below to create a &mut dyn Folder
from
Self
without knowing what Self
is (by invoking this
method). Effectively, this limits impls of Folder
to types
for which we are able to create a dyn value (i.e., not [T]
types). Read more
fn fold_ty(&mut self, ty: Ty<I>, outer_binder: DebruijnIndex) -> Fallible<Ty<I>>
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fn fold_ty(&mut self, ty: Ty<I>, outer_binder: DebruijnIndex) -> Fallible<Ty<I>>
[src]Top-level callback: invoked for each Ty<I>
that is
encountered when folding. By default, invokes
super_fold_with
, which will in turn invoke the more
specialized folding methods below, like fold_free_var_ty
. Read more
fn fold_lifetime(
&mut self,
lifetime: Lifetime<I>,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
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fn fold_lifetime(
&mut self,
lifetime: Lifetime<I>,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
[src]Top-level callback: invoked for each Lifetime<I>
that is
encountered when folding. By default, invokes
super_fold_with
, which will in turn invoke the more
specialized folding methods below, like fold_free_var_lifetime
. Read more
fn fold_const(
&mut self,
constant: Const<I>,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
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fn fold_const(
&mut self,
constant: Const<I>,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
[src]Top-level callback: invoked for each Const<I>
that is
encountered when folding. By default, invokes
super_fold_with
, which will in turn invoke the more
specialized folding methods below, like fold_free_var_const
. Read more
fn fold_program_clause(
&mut self,
clause: ProgramClause<I>,
outer_binder: DebruijnIndex
) -> Fallible<ProgramClause<I>>
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fn fold_program_clause(
&mut self,
clause: ProgramClause<I>,
outer_binder: DebruijnIndex
) -> Fallible<ProgramClause<I>>
[src]Invoked for every program clause. By default, recursively folds the goals contents.
fn fold_goal(
&mut self,
goal: Goal<I>,
outer_binder: DebruijnIndex
) -> Fallible<Goal<I>>
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fn fold_goal(
&mut self,
goal: Goal<I>,
outer_binder: DebruijnIndex
) -> Fallible<Goal<I>>
[src]Invoked for every goal. By default, recursively folds the goals contents.
fn forbid_free_vars(&self) -> bool
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fn forbid_free_vars(&self) -> bool
[src]If overridden to return true, then folding will panic if a free variable is encountered. This should be done if free type/lifetime variables are not expected. Read more
fn forbid_free_placeholders(&self) -> bool
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fn forbid_free_placeholders(&self) -> bool
[src]If overridden to return true, we will panic when a free placeholder type/lifetime/const is encountered. Read more
fn fold_free_placeholder_ty(
&mut self,
universe: PlaceholderIndex,
outer_binder: DebruijnIndex
) -> Fallible<Ty<I>>
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fn fold_free_placeholder_ty(
&mut self,
universe: PlaceholderIndex,
outer_binder: DebruijnIndex
) -> Fallible<Ty<I>>
[src]Invoked for each occurrence of a placeholder type; these are
used when we instantiate binders universally. Returns a type
to use instead, which should be suitably shifted to account
for binders
. Read more
fn fold_free_placeholder_lifetime(
&mut self,
universe: PlaceholderIndex,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
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fn fold_free_placeholder_lifetime(
&mut self,
universe: PlaceholderIndex,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
[src]As with fold_free_placeholder_ty
, but for lifetimes.
fn fold_free_placeholder_const(
&mut self,
ty: Ty<I>,
universe: PlaceholderIndex,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
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fn fold_free_placeholder_const(
&mut self,
ty: Ty<I>,
universe: PlaceholderIndex,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
[src]As with fold_free_placeholder_ty
, but for constants.
fn forbid_inference_vars(&self) -> bool
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fn forbid_inference_vars(&self) -> bool
[src]If overridden to return true, inference variables will trigger panics when folded. Used when inference variables are unexpected. Read more
fn fold_inference_ty(
&mut self,
var: InferenceVar,
kind: TyVariableKind,
outer_binder: DebruijnIndex
) -> Fallible<Ty<I>>
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fn fold_inference_ty(
&mut self,
var: InferenceVar,
kind: TyVariableKind,
outer_binder: DebruijnIndex
) -> Fallible<Ty<I>>
[src]Invoked for each occurrence of a inference type; these are
used when we instantiate binders universally. Returns a type
to use instead, which should be suitably shifted to account
for binders
. Read more
fn fold_inference_lifetime(
&mut self,
var: InferenceVar,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
[src]
fn fold_inference_lifetime(
&mut self,
var: InferenceVar,
outer_binder: DebruijnIndex
) -> Fallible<Lifetime<I>>
[src]As with fold_inference_ty
, but for lifetimes.
fn fold_inference_const(
&mut self,
ty: Ty<I>,
var: InferenceVar,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
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fn fold_inference_const(
&mut self,
ty: Ty<I>,
var: InferenceVar,
outer_binder: DebruijnIndex
) -> Fallible<Const<I>>
[src]As with fold_inference_ty
, but for constants.
Auto Trait Implementations
impl<'s, 'i, I> RefUnwindSafe for Subst<'s, 'i, I> where
I: RefUnwindSafe,
<I as Interner>::InternedGenericArg: RefUnwindSafe,
I: RefUnwindSafe,
<I as Interner>::InternedGenericArg: RefUnwindSafe,
impl<'s, 'i, I> Send for Subst<'s, 'i, I> where
I: Sync,
<I as Interner>::InternedGenericArg: Sync,
I: Sync,
<I as Interner>::InternedGenericArg: Sync,
impl<'s, 'i, I> Sync for Subst<'s, 'i, I> where
I: Sync,
<I as Interner>::InternedGenericArg: Sync,
I: Sync,
<I as Interner>::InternedGenericArg: Sync,
impl<'s, 'i, I> Unpin for Subst<'s, 'i, I>
impl<'s, 'i, I> UnwindSafe for Subst<'s, 'i, I> where
I: RefUnwindSafe,
<I as Interner>::InternedGenericArg: RefUnwindSafe,
I: RefUnwindSafe,
<I as Interner>::InternedGenericArg: RefUnwindSafe,
Blanket Implementations
impl<T> BorrowMut<T> for T where
T: ?Sized,
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impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut T
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pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<T> Cast for T
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impl<T> Cast for T
[src]fn cast<U>(self, interner: &U::Interner) -> U where
Self: CastTo<U>,
U: HasInterner,
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fn cast<U>(self, interner: &U::Interner) -> U where
Self: CastTo<U>,
U: HasInterner,
[src]Cast a value to type U
using CastTo
.