pub struct Canonical<'gcx, V> {
pub variables: CanonicalVarInfos<'gcx>,
pub value: V,
}
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A "canonicalized" type V
is one where all free inference
variables have been rewritten to "canonical vars". These are
numbered starting from 0 in order of first appearance.
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Instantiate the wrapped value, replacing each canonical value
with the value given in var_values
.
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Allows one to apply a substitute to some subset of
self.value
. Invoke projection_fn
with self.value
to get
a value V that is expressed in terms of the same canonical
variables bound in self
(usually this extracts from subset
of self
). Apply the substitution var_values
to this value
V, replacing each of the canonical variables.
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Allows you to map the value
of a canonical while keeping the
same set of bound variables.
WARNING: This function is very easy to mis-use, hence the
name! In particular, the new value W
must use all the
same type/region variables in precisely the same order
as the original! (The ordering is defined by the
TypeFoldable
implementation of the type in question.)
An example of a correct use of this:
let a: Canonical<'_, T> = ...;
let b: Canonical<'_, (T,)> = a.unchecked_map(|v| (v, ));
An example of an incorrect use of this:
let a: Canonical<'tcx, T> = ...;
let ty: Ty<'tcx> = ...;
let b: Canonical<'tcx, (T, Ty<'tcx>)> = a.unchecked_map(|v| (v, ty));
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Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Feeds this value into the given [Hasher
]. Read more
Feeds a slice of this type into the given [Hasher
]. Read more
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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
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True if this self
has any regions that escape binder
(and hence are not bound by it). Read more
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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
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True if there any any un-erased free regions.
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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
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True if there are any late-bound regions
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A visitor that does not recurse into types, works like fn walk_shallow
in Ty
.
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Canonical query goals correspond to abstract trait operations that
are not tied to any crate in particular.
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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
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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
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Creates owned data from borrowed data, usually by cloning. Read more
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)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
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)
The type returned in the event of a conversion error.
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Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
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The type returned in the event of a conversion error.
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Mutably borrows from an owned value. Read more
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this method will likely be replaced by an associated static
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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