pub enum TraitSpecializationKind {
    None,
    Marker,
    AlwaysApplicable,
}
Expand description

Whether this trait is treated specially by the standard library specialization lint.

Variants

None

The default. Specializing on this trait is not allowed.

Marker

Specializing on this trait is allowed because it doesn’t have any methods. For example Sized or FusedIterator. Applies to traits with the rustc_unsafe_specialization_marker attribute.

AlwaysApplicable

Specializing on this trait is allowed because all of the impls of this trait are “always applicable”. Always applicable means that if X<'x>: T<'y> for any lifetimes, then for<'a, 'b> X<'a>: T<'b>. Applies to traits with the rustc_specialization_trait attribute.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

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:

  • None: 0 bytes
  • Marker: 0 bytes
  • AlwaysApplicable: 0 bytes