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

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<ScopesAndKind<'tcx>>>,
}
🔬 This is a nightly-only experimental API. (rustc_private)

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Fields

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How are we relating a and b?

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

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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".

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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]

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Trait Implementations

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

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

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

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Switch variance for the purpose of relating a and b.

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

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Generic relation routine suitable for most anything.

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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>