Enum Cancelled 

#[non_exhaustive]
pub enum Cancelled {
    Local,
    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.

Local

The query was operating but the local database execution has been cancelled.

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)>

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.