Enum Why 

pub enum Why {
    Contract(Vec<LeafFailure>),
    Durability {
        declared: Durability,
        wanted: Durability,
    },
    DurabilityUnknown {
        wanted: Durability,
    },
}

Why a backend is not in the ranking.

Variants

Contract(Vec<LeafFailure>)

Failed (or was never tested on) a needed leaf.

Durability

Its declared durability is below the minimum.

Fields

declared: Durability

What it declares.

wanted: Durability

What was asked for.

DurabilityUnknown

No durability declaration exists, and the need asks for more than Volatile.

Fields

wanted: Durability

What was asked for.

Trait Implementations

impl Clone for Why

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Why

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

Formats the value using the given formatter.

impl Display for Why

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

Formats the value using the given formatter.

impl Eq for Why

impl PartialEq for Why

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Why