Module predicate 

Structs

AliasTerm

Represents the unprojected term of a projection goal.

CoercePredicate

Encodes that we have to coerce from the a type to the b type.

ExistentialProjection

A ProjectionPredicate for an ExistentialTraitRef.

ExistentialTraitRef

An existential reference to a trait, where Self is erased. For example, the trait object Trait<'a, 'b, X, Y> is:

HostEffectPredicate

NormalizesTo

Used by the new solver to normalize an alias. This always expects the term to be an unconstrained inference variable which is used as the output.

OutlivesPredicate

A: 'region

ProjectionPredicate

This kind of predicate has no direct correspondent in the syntax, but it roughly corresponds to the syntactic forms:

SubtypePredicate

Encodes that a must be a subtype of b. The a_is_expected flag indicates whether the a type is the type that we should label as “expected” when presenting user diagnostics.

TraitPredicate

TraitRef

A complete reference to a trait. These take numerous guises in syntax, but perhaps the most recognizable form is in a where-clause:

Enums

AliasTermKind

BoundConstness

ExistentialPredicate

ImplPolarity

PredicatePolarity

Polarity for a trait predicate. May either be negative or positive. Distinguished from ImplPolarity since we never compute goals with “reservation” level.