Enum rustc::mir::ProjectionElem

pub enum ProjectionElem<V, T> {
    Deref,
    Field(Field, T),
    Index(V),
    ConstantIndex {
        offset: u32,
        min_length: u32,
        from_end: bool,
    },
    Subslice {
        from: u32,
        to: u32,
    },
    Downcast(Option<Symbol>, VariantIdx),
}

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Variants

Deref

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Field(Field, T)

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Index(V)

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

ConstantIndex

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

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 an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

index or -index (in Python terms), depending on from_end

min_length: u32

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

thing being indexed must be at least this long

from_end: bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

counting backwards from end?

Subslice

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

These indices are generated by slice patterns.

slice[from:-to] in Python terms.

Fields of Subslice

from: u32

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

to: u32

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Downcast(Option<Symbol>, VariantIdx)

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

"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.

The included Symbol is the name of the variant, used for printing MIR.

Trait Implementations

impl<V: Clone, T: Clone> Clone for ProjectionElem<V, T>

fn clone(&self) -> ProjectionElem<V, T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<V: Ord, T: Ord> Ord for ProjectionElem<V, T>

fn cmp(&self, other: &ProjectionElem<V, T>) -> Ordering

This method returns an Ordering between self and other.

default fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

default fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

default fn clamp(self, min: Self, max: Self) -> Self

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

Restrict a value to a certain interval.

impl<V: Eq, T: Eq> Eq for ProjectionElem<V, T>

fn assert_receiver_is_total_eq(&self)

impl<V: PartialOrd, T: PartialOrd> PartialOrd<ProjectionElem<V, T>> for ProjectionElem<V, T>

fn partial_cmp(&self, other: &ProjectionElem<V, T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &ProjectionElem<V, T>) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &ProjectionElem<V, T>) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &ProjectionElem<V, T>) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &ProjectionElem<V, T>) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<V: PartialEq, T: PartialEq> PartialEq<ProjectionElem<V, T>> for ProjectionElem<V, T>

fn eq(&self, other: &ProjectionElem<V, T>) -> bool

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

fn ne(&self, other: &ProjectionElem<V, T>) -> bool

This method tests for !=.

impl<V: Debug, T: Debug> Debug for ProjectionElem<V, T>

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

Formats the value using the given formatter.

impl<V: Hash, T: Hash> Hash for ProjectionElem<V, T>

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

Feeds this value into the given [Hasher].

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

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

impl<V: Decodable, T: Decodable> Decodable for ProjectionElem<V, T>

fn decode<__DVT: Decoder>(
    d: &mut __DVT
) -> Result<ProjectionElem<V, T>, __DVT::Error>

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<V: Encodable, T: Encodable> Encodable for ProjectionElem<V, T>

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

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

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

fn hash_stable<__W: StableHasherResult>(
    &self,
    __hcx: &mut StableHashingContext<'__ctx>,
    __hasher: &mut StableHasher<__W>
)

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.