Enum MaybeCause 

pub enum MaybeCause {
    Ambiguity,
    Overflow {
        suggest_increasing_limit: bool,
        keep_constraints: bool,
    },
}

Why we failed to evaluate a goal.

Variants

Ambiguity

We failed due to ambiguity. This ambiguity can either be a true ambiguity, i.e. there are multiple different answers, or we hit a case where we just don’t bother, e.g. ?x: Trait goals.

Overflow

We gave up due to an overflow, most often by hitting the recursion limit.

Fields

suggest_increasing_limit: bool

keep_constraints: bool

Implementations

impl MaybeCause

pub fn or(self, other: MaybeCause) -> MaybeCause

Trait Implementations

impl Clone for MaybeCause

fn clone(&self) -> MaybeCause

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MaybeCause

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

Formats the value using the given formatter.

impl Hash for MaybeCause

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for MaybeCause

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for MaybeCause

impl Eq for MaybeCause

impl StructuralPartialEq for MaybeCause