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

struct TypeGeneralizer<'me, 'bccx: 'me, 'gcx: 'tcx, 'tcx: 'bccx> {
    type_rel: &'me TypeRelating<'me, 'bccx, 'gcx, 'tcx>,
    ambient_variance: Variance,
    first_free_index: DebruijnIndex,
    universe: UniverseIndex,
}
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The "type generalize" is used when handling inference variables.

The basic strategy for handling a constraint like ?A <: B is to apply a "generalization strategy" to the type B -- this replaces all the lifetimes in the type B with fresh inference variables. (You can read more about the strategy in this blog post.)

As an example, if we had ?A <: &'x u32, we would generalize &'x u32 to &'0 u32 where '0 is a fresh variable. This becomes the value of A. Finally, we relate &'0 u32 <: &'x u32, which establishes '0: 'x as a constraint.

As a side-effect of this generalization procedure, we also replace all the bound regions that we have traversed with concrete values, so that the resulting generalized type is independent from the scopes.

Fields

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

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After we generalize this type, we are going to relative it to some other type. What will be the variance at this point?

🔬 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<'me, 'gcx, 'tcx, 'bbcx> TypeRelation<'me, 'gcx, 'tcx> for TypeGeneralizer<'me, 'bbcx, 'gcx, 'tcx>
[src]

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

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🔬 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)

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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<'me, 'bccx, 'gcx, 'tcx> !Send for TypeGeneralizer<'me, 'bccx, 'gcx, 'tcx>

impl<'me, 'bccx, 'gcx, 'tcx> !Sync for TypeGeneralizer<'me, '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]

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

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]

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

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
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

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

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

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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
[src]

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

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

impl<T> Erased for T

impl<T> MaybeResult for T
[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?

impl<'a, T> Captures for T where
    T: ?Sized
[src]