Struct Cause 

pub struct Cause {
    pub message: Arc<Message>,
    pub classification: Classification,
}

Description of the cause of a diagnostic.

Fields

message: Arc<Message>

The error message. Within this crate we don’t bother typing these beyond the Classification enum, but we do retain typing information for messages from other crates.

classification: Classification

Classification of this cause. This attaches an error code and generic message for said code to the diagnostic message. The user can use these codes to for instance always promote a particular type of diagnostic to an error (like gcc -Werror).

Implementations

impl Cause

pub fn prefix<S: AsRef<str>>(self, prefix: S) -> Cause

Prefixes the message with context information.

Trait Implementations

impl Clone for Cause

fn clone(&self) -> Cause

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Cause

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

Formats the value using the given formatter.

impl Display for Cause

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

Formats the value using the given formatter.

impl Error for Cause

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 Cause

fn eq(&self, other: &Self) -> 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.