Struct Caused 

pub struct Caused { /* private fields */ }

A report’s frames as an ordinary error chain.

A Report keeps its frames itself, and Error::source has to hand back something with a life of its own, so the chain is copied out where a report crosses into a set. One link per context, carrying the attachments that were put on it - the key, the file, the engine’s own words - so a caller who walks the chain and prints it gets what the report holds without knowing there is a report.

The outermost context is left out: whoever carries this says it already, and printing it again is the duplicate line this exists to remove. What was attached to it is kept and moves down onto the first link that is a cause, so no link is facts with nothing that failed above them - a reader walking causes should meet causes. Only where the outermost is the sole context do the facts stand on their own, because then there is nothing to move them to.

Implementations

impl Caused

pub fn under<C>(report: &Report<C>) -> Option<Self>

The chain under report’s outermost context, or None when the outermost is all there is and carries nothing.

Trait Implementations

impl Debug for Caused

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

Formats the value using the given formatter.

impl Display for Caused

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

Formats the value using the given formatter.

impl Error for Caused

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.