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NoSolutionOrOpaquesAccessed

rustc_middle::traits::solve

Enum NoSolutionOrOpaquesAccessed 

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pub enum NoSolutionOrOpaquesAccessed {
    NoSolution(NoSolution),
    OpaquesAccessed,
}

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NoSolution(NoSolution)

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OpaquesAccessed

A bit like NoSolution, but for functions that normally cannot fail unless they accessed opaues. (See TypingMode::ErasedNotCoherence). Getting OpaquesAccessed doesn’t mean there truly is no solution. It just means that we want to bail out of the current query as fast as possible, possibly by returning NoSolution if that’s fastest. This is okay because when you get OpaquesAccessed we’re guaranteed that we’re going to retry this query in the original typing mode to get the correct answer.

Trait Implementations§

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impl From<NoSolution> for NoSolutionOrOpaquesAccessed

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fn from(value: NoSolution) -> NoSolutionOrOpaquesAccessed

Converts to this type from the input type.
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impl From<NoSolutionOrOpaquesAccessed> for NoSolution

This conversion is sound, because even in we’re in OpaquesAccessed, we’re going to retry so NoSolution is a valid response to give..

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fn from(_: NoSolutionOrOpaquesAccessed) -> NoSolution

Converts to this type from the input type.

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impl<T> Aligned for T

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const ALIGN: Alignment

Alignment of Self.
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where T: 'static + ?Sized,

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type Output = R

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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:

  • NoSolution: 0 bytes
  • OpaquesAccessed: 0 bytes