Enum chalk_engine::logic::RootSearchFail

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pub(crate) enum RootSearchFail {
    NoMoreSolutions,
    Floundered,
    QuantumExceeded,
    NegativeCycle,
    InvalidAnswer,
}
Expand description

The different ways that a root search (which potentially pursues many strands) can fail. A root search is one that begins with an empty stack.

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NoMoreSolutions

The table we were trying to solve cannot succeed.

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Floundered

The table cannot be solved without more type information.

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QuantumExceeded

We did not find a solution, but we still have things to try. Repeat the request, and we’ll give one of those a spin.

(In a purely depth-first-based solver, like Prolog, this doesn’t appear.)

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NegativeCycle

A negative cycle was found. This is fail-fast, so even if there was possibly a solution (ambiguous or not), it may not have been found.

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InvalidAnswer

The current answer index is not useful. Currently, this is returned because the current answer needs refining.

Trait Implementations§

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impl Debug for RootSearchFail

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

Formats the value using the given formatter. Read more

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