Enum rustc::middle::resolve_lifetime::Scope

enum Scope<'a> {
    Binder {
        lifetimes: FxHashMap<LifetimeName, Region>,
        next_early_index: u32,
        abstract_type_parent: bool,
        s: &'a Scope<'a>,
    },
    Body {
        id: BodyId,
        s: &'a Scope<'a>,
    },
    Elision {
        elide: Elide,
        s: &'a Scope<'a>,
    },
    ObjectLifetimeDefault {
        lifetime: Option<Region>,
        s: &'a Scope<'a>,
    },
    Root,
}

🔬 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?

Variants

Binder

🔬 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?

Declares lifetimes, and each can be early-bound or late-bound. The DebruijnIndex of late-bound lifetimes starts at 1 and it should be shifted by the number of Binders in between the declaration Binder and the location it's referenced from.

Fields of Binder

lifetimes: FxHashMap<LifetimeName, Region>	🔬 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?
next_early_index: u32	🔬 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? if we extend this scope with another scope, what is the next index we should use for an early-bound region?
abstract_type_parent: bool	🔬 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? Whether or not this binder would serve as the parent binder for abstract types introduced within. For example: fn foo<'a>() -> impl for<'b> Trait<Item = impl Trait2<'a>> Here, the abstract types we create for the impl Trait and impl Trait2 references will both have the foo item as their parent. When we get to impl Trait2, we find that it is nested within the for<> binder -- this flag allows us to skip that when looking for the parent binder of the resulting abstract type.
s: &'a Scope<'a>	🔬 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?

Body

🔬 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?

Lifetimes introduced by a fn are scoped to the call-site for that fn, if this is a fn body, otherwise the original definitions are used. Unspecified lifetimes are inferred, unless an elision scope is nested, e.g. (&T, fn(&T) -> &T); becomes (&'_ T, for<'a> fn(&'a T) -> &'a T).

Fields of Body

id: BodyId	🔬 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?
s: &'a Scope<'a>	🔬 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?

Elision

🔬 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?

A scope which either determines unspecified lifetimes or errors on them (e.g. due to ambiguity). For more details, see Elide.

Fields of Elision

elide: Elide	🔬 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?
s: &'a Scope<'a>	🔬 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?

ObjectLifetimeDefault

🔬 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?

Use a specific lifetime (if Some) or leave it unset (to be inferred in a function body or potentially error outside one), for the default choice of lifetime in a trait object type.

Fields of ObjectLifetimeDefault

lifetime: Option<Region>	🔬 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?
s: &'a Scope<'a>	🔬 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?

Root

🔬 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<'a> Debug for Scope<'a>

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.