Enum CurrentGoalKind 

enum CurrentGoalKind {
    Misc,
    CoinductiveTrait,
    ProjectionComputeAssocTermCandidate,
}

The kind of goal we’re currently proving.

This has effects on cycle handling handling and on how we compute query responses, see the variant descriptions for more info.

Variants

Misc

CoinductiveTrait

We’re proving an trait goal for a coinductive trait, either an auto trait or Sized.

These are currently the only goals whose impl where-clauses are considered to be productive steps.

ProjectionComputeAssocTermCandidate

Unlike other goals, NormalizesTo goals aren’t independent goals but just implementation details for handling projections of associated terms. When we encounter a Projection goal whose projection_term is an associated term, we create a NormalizesTo goal whose expected term is fully unconstrained and evaluate it.

This would weaken inference however, as the nested goals of normalizes-to never get the inference constraints from the actual expected term. We just gather candidates from the normalizes-to goal and return any ambiguous nested goals of it to the caller (Projection goal). The caller handle and evaluate them as if they were its own nested goals.

Because of this, evaluating a normalizes-to goal is computing candidates for projection of an associated term and it never leaks out of the solver.

Implementations

impl CurrentGoalKind

fn from_query_input<I: Interner>( cx: I, input: QueryInput<I, I::Predicate>, ) -> CurrentGoalKind

Trait Implementations

impl Clone for CurrentGoalKind

fn clone(&self) -> CurrentGoalKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CurrentGoalKind

impl Debug for CurrentGoalKind

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

Formats the value using the given formatter.

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:

• Misc: 0 bytes
• CoinductiveTrait: 0 bytes
• ProjectionComputeAssocTermCandidate: 0 bytes