Enum rustc_span::hygiene::DesugaringKind

pub enum DesugaringKind {
    CondTemporary,
    QuestionMark,
    TryBlock,
    OpaqueTy,
    Async,
    Await,
    ForLoop,
    LetElse,
    WhileLoop,
}

The kind of compiler desugaring.

Variants

CondTemporary

We desugar if c { i } else { e } to match $ExprKind::Use(c) { true => i, _ => e }. However, we do not want to blame c for unreachability but rather say that i is unreachable. This desugaring kind allows us to avoid blaming c. This also applies to while loops.

QuestionMark

TryBlock

OpaqueTy

Desugaring of an impl Trait in return type position to an type Foo = impl Trait; and replacing the impl Trait with Foo.

Async

Await

ForLoop

LetElse

WhileLoop

Implementations

impl DesugaringKind

pub fn descr(self) -> &'static str

The description wording should combine well with “desugaring of {}”.

Trait Implementations

impl Clone for DesugaringKind

fn clone(&self) -> DesugaringKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for DesugaringKind

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

Formats the value using the given formatter.

impl<__D: Decoder> Decodable<__D> for DesugaringKind

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl<__E: Encoder> Encodable<__E> for DesugaringKind

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

impl<__CTX> HashStable<__CTX> for DesugaringKind where
    __CTX: HashStableContext, 

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl PartialEq<DesugaringKind> for DesugaringKind

fn eq(&self, other: &DesugaringKind) -> bool

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

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Copy for DesugaringKind

impl StructuralPartialEq for DesugaringKind

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• CondTemporary: 0 bytes
• QuestionMark: 0 bytes
• TryBlock: 0 bytes
• OpaqueTy: 0 bytes
• Async: 0 bytes
• Await: 0 bytes
• ForLoop: 0 bytes
• LetElse: 0 bytes
• WhileLoop: 0 bytes