Enum salsa_2022::cancelled::Cancelled

#[non_exhaustive]
pub enum Cancelled {
    PendingWrite,
    PropagatedPanic,
}

A panic payload indicating that execution of a salsa query was cancelled.

This can occur for a few reasons:

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

PendingWrite

The query was operating on revision R, but there is a pending write to move to revision R+1.

PropagatedPanic

The query was blocked on another thread, and that thread panicked.

Implementations

impl Cancelled

pub fn catch<F, T>(f: F) -> Result<T, Cancelled>where
    F: FnOnce() -> T + UnwindSafe,

Runs f, and catches any salsa cancellation.

Trait Implementations

impl Debug for Cancelled

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

Formats the value using the given formatter.

impl Display for Cancelled

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

Formats the value using the given formatter.

impl Error for Cancelled

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

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 self, demand: &mut Demand<'a>)

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

Provides type based access to context intended for error reports.