Enum cargo::core::resolver::dep_cache::RequirementError

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enum RequirementError {
    MissingFeature(InternedString),
    MissingDependency(InternedString),
    Cycle(InternedString),
}
Expand description

An error for a requirement.

This will later be converted to an ActivateError depending on whether or not this is a dependency or a root package.

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MissingFeature(InternedString)

The package does not have the requested feature.

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MissingDependency(InternedString)

The package does not have the requested dependency.

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Cycle(InternedString)

A feature has a direct cycle to itself.

Note that cycles through multiple features are allowed (but perhaps they shouldn’t be?).

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That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

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type Output = T

Should always be Self
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type Error = Infallible

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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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: 24 bytes

Size for each variant:

  • MissingFeature: 16 bytes
  • MissingDependency: 16 bytes
  • Cycle: 16 bytes