Enum CoalesceError 

pub enum CoalesceError {
    LeftNotOption(Ty),
    Mismatch {
        element: Ty,
        fallback: Ty,
    },
}

Why an coalesce application is ill-typed (NS-A1, F19).

Variants

LeftNotOption(Ty)

The left operand is a concrete non-Option type — coalescing is only defined over an optional left-hand side (Option<T> or …).

Mismatch

The element/right types are structurally irreconcilable (Option<int> or "text" — the join of int and string is Conflicted).

Fields

element: Ty

fallback: Ty

Trait Implementations

impl Clone for CoalesceError

fn clone(&self) -> CoalesceError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CoalesceError

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

Formats the value using the given formatter.

impl Eq for CoalesceError

impl PartialEq for CoalesceError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CoalesceError