CandidatePreferenceMode

rustc_trait_selection::traits::solve

Enum CandidatePreferenceMode 

pub enum CandidatePreferenceMode {
    Default,
    Marker,
}
Expand description

Which trait candidates should be preferred over other candidates? By default, prefer where bounds over alias bounds. For marker traits, prefer alias bounds over where bounds.

Variants§

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Default

Prefers where bounds over alias bounds

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Marker

Prefers alias bounds over where bounds

Implementations§

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impl CandidatePreferenceMode

pub fn compute<I>( cx: I, trait_id: <I as Interner>::TraitId, ) -> CandidatePreferenceMode
where I: Interner,

Given trait_def_id, which candidate preference mode should be used?

Trait Implementations§

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impl Clone for CandidatePreferenceMode

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fn clone(&self) -> CandidatePreferenceMode

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CandidatePreferenceMode

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

Formats the value using the given formatter. Read more
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impl Copy for CandidatePreferenceMode

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impl<T> Aligned for T

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const ALIGN: Alignment

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T

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fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]

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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T

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fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn collect_and_apply<I, F>(iter: I, f: F) -> R
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Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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type Error = !

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const ALIGN: usize

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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:

  • Default: 0 bytes
  • Marker: 0 bytes