Enum rustc_trait_selection::solve::inspect::ProbeKind

pub enum ProbeKind<'tcx> {
    Root {
        result: Result<Canonical<'tcx, Response<'tcx>>, NoSolution>,
    },
    NormalizedSelfTyAssembly,
    MiscCandidate {
        name: &'static str,
        result: Result<Canonical<'tcx, Response<'tcx>>, NoSolution>,
    },
    TraitCandidate {
        source: CandidateSource,
        result: Result<Canonical<'tcx, Response<'tcx>>, NoSolution>,
    },
    UnsizeAssembly,
    UpcastProjectionCompatibility,
}

What kind of probe we’re in. In case the probe represents a candidate, or the final result of the current goal - via ProbeKind::Root - we also store the QueryResult.

Variants

Root

Fields

result: Result<Canonical<'tcx, Response<'tcx>>, NoSolution>

The root inference context while proving a goal.

NormalizedSelfTyAssembly

Probe entered when normalizing the self ty during candidate assembly

MiscCandidate

Fields

name: &'static str

result: Result<Canonical<'tcx, Response<'tcx>>, NoSolution>

Some candidate to prove the current goal.

FIXME: Remove this in favor of always using more strongly typed variants.

TraitCandidate

Fields

source: CandidateSource

result: Result<Canonical<'tcx, Response<'tcx>>, NoSolution>

A candidate for proving a trait or alias-relate goal.

UnsizeAssembly

Used in the probe that wraps normalizing the non-self type for the unsize trait, which is also structurally matched on.

UpcastProjectionCompatibility

During upcasting from some source object to target object type, used to do a probe to find out what projection type(s) may be used to prove that the source type upholds all of the target type’s object bounds.

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: 64 bytes

Size for each variant:

• Root: 40 bytes
• NormalizedSelfTyAssembly: 0 bytes
• MiscCandidate: 56 bytes
• TraitCandidate: 56 bytes
• UnsizeAssembly: 0 bytes
• UpcastProjectionCompatibility: 0 bytes