Enum rustc_builtin_macros::deriving::generic::FieldlessVariantsStrategy

pub(crate) enum FieldlessVariantsStrategy {
    Unify,
    Default,
    SpecializeIfAllVariantsFieldless,
}

How to handle fieldless enum variants.

Variants

Unify

Combine fieldless variants into a single match arm. This assumes that relevant information has been handled by looking at the enum’s discriminant.

Default

Don’t do anything special about fieldless variants. They are handled like any other variant.

SpecializeIfAllVariantsFieldless

If all variants of the enum are fieldless, expand the special AllFieldLessEnum substructure, so that the entire enum can be handled at once.

Trait Implementations

impl PartialEq for FieldlessVariantsStrategy

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for FieldlessVariantsStrategy

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:

• Unify: 0 bytes
• Default: 0 bytes
• SpecializeIfAllVariantsFieldless: 0 bytes