Struct TransactionError 

#[non_exhaustive]
pub struct TransactionError {
    pub cause: Error,
    pub rollback: Rollback,
}

The error Jj::transaction returns when its closure fails. It preserves the closure’s own error in cause — the same value the previous (rollback-swallowing) Result<T> contract returned — and additionally records what the concurrency-safe rollback did in rollback, so a failed or refused rollback is visible to the caller instead of silently dropped (the earlier let _ = op_restore(..) discarded it).

Match rollback to distinguish Restored / SkippedDiverged / Failed; call into_cause for a drop-in of the old “closure error only” behavior.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

cause: Error

The error the closure returned — the transaction’s root cause.

rollback: Rollback

What the concurrency-safe rollback did in response to cause.

Implementations

impl TransactionError

pub fn cause(&self) -> &Error

The closure’s error — the transaction’s root cause (what the old Result<T> contract returned).

pub fn rollback(&self) -> &Rollback

What the rollback did — Restored / SkippedDiverged / Failed.

pub fn into_cause(self) -> Error

Consume, returning just the closure’s error — the drop-in for code that only wants the old “closure error” and does not act on the rollback outcome.

Trait Implementations

impl Debug for TransactionError

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

Formats the value using the given formatter.

impl Display for TransactionError

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

Formats the value using the given formatter.

impl Error for TransactionError

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.