Enum rustc::mir::ProjectionElem

pub enum ProjectionElem<'tcx, V, T> {
    Deref,
    Field(Field, T),
    Index(V),
    ConstantIndex {
        offset: u32,
        min_length: u32,
        from_end: bool,
    },
    Subslice {
        from: u32,
        to: u32,
    },
    Downcast(&'tcx AdtDef, usize),
}

🔬 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

Deref

🔬 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?

Field(Field, T)

🔬 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?

Index(V)

🔬 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?

ConstantIndex

🔬 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?

These indices are generated by slice patterns. Easiest to explain by example:

[X, _, .._, _, _] => { offset: 0, min_length: 4, from_end: false },
[_, X, .._, _, _] => { offset: 1, min_length: 4, from_end: false },
[_, _, .._, X, _] => { offset: 2, min_length: 4, from_end: true },
[_, _, .._, _, X] => { offset: 1, min_length: 4, from_end: true },

Fields of ConstantIndex

offset: 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? index or -index (in Python terms), depending on from_end
min_length: 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? thing being indexed must be at least this long
from_end: 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? counting backwards from end?

Subslice

🔬 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?

These indices are generated by slice patterns.

slice[from:-to] in Python terms.

Fields of Subslice

from: 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?
to: 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?

Downcast(&'tcx AdtDef, usize)

🔬 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?

"Downcast" to a variant of an ADT. Currently, we only introduce this for ADTs with more than one variant. It may be better to just introduce it always, or always for enums.

Trait Implementations

impl<'gcx, V, T> HashStable<StableHashingContext<'gcx>> for ProjectionElem<'gcx, V, T> where
    V: HashStable<StableHashingContext<'gcx>>,
    T: HashStable<StableHashingContext<'gcx>>, 

fn hash_stable<W: StableHasherResult>(
    &self,
    hcx: &mut StableHashingContext<'gcx>,
    hasher: &mut StableHasher<W>
)

🔬 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<'tcx, V: Clone, T: Clone> Clone for ProjectionElem<'tcx, V, T>

fn clone(&self) -> ProjectionElem<'tcx, V, T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx, V: Debug, T: Debug> Debug for ProjectionElem<'tcx, V, T>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<'tcx, V: PartialEq, T: PartialEq> PartialEq for ProjectionElem<'tcx, V, T>

fn eq(&self, __arg_0: &ProjectionElem<'tcx, V, T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &ProjectionElem<'tcx, V, T>) -> bool

This method tests for !=.

impl<'tcx, V: Eq, T: Eq> Eq for ProjectionElem<'tcx, V, T>

impl<'tcx, V: Hash, T: Hash> Hash for ProjectionElem<'tcx, V, T>

fn hash<__HVT: Hasher>(&self, __arg_0: &mut __HVT)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl<'tcx, V: Encodable, T: Encodable> Encodable for ProjectionElem<'tcx, V, T>

fn encode<__SVT: Encoder>(
    &self,
    __arg_0: &mut __SVT
) -> Result<(), __SVT::Error>

🔬 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<'tcx, V: Decodable, T: Decodable> Decodable for ProjectionElem<'tcx, V, T>

fn decode<__DVT: Decoder>(
    __arg_0: &mut __DVT
) -> Result<ProjectionElem<'tcx, V, T>, __DVT::Error>

🔬 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?