Enum Usefulness 

pub enum Usefulness<'p, Cx: PatCx> {
    Useful(Vec<(&'p DeconstructedPat<Cx>, RedundancyExplanation<'p, Cx>)>),
    Redundant(RedundancyExplanation<'p, Cx>),
}

Indicates whether or not a given arm is useful.

Variants

Useful(Vec<(&'p DeconstructedPat<Cx>, RedundancyExplanation<'p, Cx>)>)

The arm is useful. This additionally carries a set of or-pattern branches that have been found to be redundant despite the overall arm being useful. Used only in the presence of or-patterns, otherwise it stays empty.

Redundant(RedundancyExplanation<'p, Cx>)

The arm is redundant and can be removed without changing the behavior of the match expression.

Trait Implementations

impl<'p, Cx: Clone + PatCx> Clone for Usefulness<'p, Cx>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'p, Cx: Debug + PatCx> Debug for Usefulness<'p, Cx>

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

Formats the value using the given formatter.