Enum rustc_pattern_analysis::pat::PatOrWild

pub(crate) enum PatOrWild<'p, Cx: PatCx> {
    Wild,
    Pat(&'p DeconstructedPat<Cx>),
}

Represents either a pattern obtained from user input or a wildcard constructed during the algorithm. Do not use Wild to represent a wildcard pattern comping from user input.

This is morally Option<&'p DeconstructedPat> where None is interpreted as a wildcard.

Variants

Wild

A non-user-provided wildcard, created during specialization.

Pat(&'p DeconstructedPat<Cx>)

A user-provided pattern.

Implementations

impl<'p, Cx: PatCx> PatOrWild<'p, Cx>

pub(crate) fn as_pat(&self) -> Option<&'p DeconstructedPat<Cx>>

pub(crate) fn ctor(self) -> &'p Constructor<Cx>

pub(crate) fn is_or_pat(&self) -> bool

pub(crate) fn expand_or_pat(self) -> SmallVec<[Self; 1]>

Expand this or-pattern into its alternatives. This only expands one or-pattern; use flatten_or_pat to recursively expand nested or-patterns.

pub(crate) fn flatten_or_pat(self) -> SmallVec<[Self; 1]>

Recursively expand this (possibly-nested) or-pattern into its alternatives.

pub(crate) fn specialize( &self, other_ctor: &Constructor<Cx>, ctor_arity: usize, ) -> SmallVec<[PatOrWild<'p, Cx>; 2]>

Specialize this pattern with a constructor. other_ctor can be different from self.ctor, but must be covered by it.

Trait Implementations

impl<'p, Cx: PatCx> Clone for PatOrWild<'p, Cx>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'p, Cx: PatCx> Debug for PatOrWild<'p, Cx>

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

Formats the value using the given formatter.

impl<'p, Cx: PatCx> Copy for PatOrWild<'p, Cx>

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: 8 bytes

Size for each variant:

• Wild: 0 bytes
• Pat: 8 bytes