[][src]Struct rustc_mir::borrow_check::nll::type_check::relate_tys::TypeRelating

struct TypeRelating<'cx, 'bccx: 'cx, 'gcx: 'tcx, 'tcx: 'bccx> {
    infcx: &'cx InferCtxt<'cx, 'gcx, 'tcx>,
    ambient_variance: Variance,
    a_scopes: Vec<BoundRegionScope>,
    b_scopes: Vec<BoundRegionScope>,
    locations: Locations,
    borrowck_context: Option<&'cx mut BorrowCheckContext<'bccx, 'tcx>>,
    canonical_var_values: IndexVec<CanonicalVar, Option<Kind<'tcx>>>,
}
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Fields

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How are we relating a and b?

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When we pass through a set of binders (e.g., when looking into a fn type), we push a new bound region scope onto here. This will contain the instantiated region for each region in those binders. When we then encounter a ReLateBound(d, br), we can use the debruijn index d to find the right scope, and then bound region name br to find the specific instantiation from within that scope. See replace_bound_region.

This field stores the instantiations for late-bound regions in the a type.

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Same as a_scopes, but for the b type.

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Where (and why) is this relation taking place?

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This will be Some when we are running the type check as part of NLL, and None if we are running a "sanity check".

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As we execute, the type on the LHS may come from a canonical source. In that case, we will sometimes find a constraint like ?0 = B, where B is a type from the RHS. The first time we find that, we simply record B (and the list of scopes that tells us how to interpret B). The next time we encounter ?0, then, we can read this value out and use it.

One problem: these variables may be in some other universe, how can we enforce that? I guess I could add some kind of "minimum universe constraint" that we can feed to the NLL checker. --> also, we know this doesn't happen

Methods

impl<'cx, 'bccx, 'gcx, 'tcx> TypeRelating<'cx, 'bccx, 'gcx, 'tcx>
[src]

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🔬 This is a nightly-only experimental API. (rustc_private)

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When we encounter binders during the type traversal, we record the value to substitute for each of the things contained in that binder. (This will be either a universal placeholder or an existential inference variable.) Given the debruijn index debruijn (and name br) of some binder we have now encountered, this routine finds the value that we instantiated the region with; to do so, it indexes backwards into the list of ambient scopes scopes.

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If r is a bound region, find the scope in which it is bound (from scopes) and return the value that we instantiated it with. Otherwise just return r.

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Push a new outlives requirement into our output set of constraints.

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When we encounter a canonical variable var in the output, equate it with kind. If the variable has been previously equated, then equate it again.

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Trait Implementations

impl<'cx, 'bccx, 'gcx, 'tcx> TypeRelation<'cx, 'gcx, 'tcx> for TypeRelating<'cx, 'bccx, 'gcx, 'tcx>
[src]

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Returns a static string we can use for printouts.

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Returns true if the value a is the "expected" type in the relation. Just affects error messages. Read more

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Switch variance for the purpose of relating a and b.

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Generic relation routine suitable for most anything.

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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<'cx, 'bccx, 'gcx, 'tcx> !Send for TypeRelating<'cx, 'bccx, 'gcx, 'tcx>

impl<'cx, 'bccx, 'gcx, 'tcx> !Sync for TypeRelating<'cx, 'bccx, 'gcx, 'tcx>

Blanket Implementations

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

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The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

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The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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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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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> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T

impl<T> MaybeResult for T
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impl<'a, T> Captures for T where
    T: ?Sized
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