Enum rustc_trait_selection::traits::SelectionError

source · 
pub enum SelectionError<'tcx> {
    Unimplemented,
    OutputTypeParameterMismatch(Binder<'tcx, TraitRef<'tcx>>, Binder<'tcx, TraitRef<'tcx>>, TypeError<'tcx>),
    TraitNotObjectSafe(DefId),
    NotConstEvaluatable(NotConstEvaluatable),
    Overflow(OverflowError),
    ErrorReporting,
}

Variants§

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Unimplemented

The trait is not implemented.

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OutputTypeParameterMismatch(Binder<'tcx, TraitRef<'tcx>>, Binder<'tcx, TraitRef<'tcx>>, TypeError<'tcx>)

After a closure impl has selected, its “outputs” were evaluated (which for closures includes the “input” type params) and they didn’t resolve. See confirm_poly_trait_refs for more.

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TraitNotObjectSafe(DefId)

The trait pointed by DefId is not object safe.

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NotConstEvaluatable(NotConstEvaluatable)

A given constant couldn’t be evaluated.

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Overflow(OverflowError)

Exceeded the recursion depth during type projection.

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ErrorReporting

Signaling that an error has already been emitted, to avoid multiple errors being shown.

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

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: 80 bytes

Size for each variant:

  • Unimplemented: 0 bytes
  • OutputTypeParameterMismatch: 80 bytes
  • TraitNotObjectSafe: 8 bytes
  • NotConstEvaluatable: 1 byte
  • Overflow: 1 byte
  • ErrorReporting: 0 bytes