Enum UndoRefusal 

pub enum UndoRefusal {
    Spent,
    Stale {
        top: Rev,
    },
}

Why a history step did not happen.

Self::Stale earns its place: a caller keeping its own history can name a rev this trail does not hold on top, and stepping its neighbour instead would be silent.

Variants

Spent

Stale

Fields

top: Rev

Trait Implementations

impl Debug for UndoRefusal

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

Formats the value using the given formatter.

impl Display for UndoRefusal

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

Formats the value using the given formatter.

impl Error for UndoRefusal

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for UndoRefusal

fn eq(&self, other: &UndoRefusal) -> 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 StructuralPartialEq for UndoRefusal