Enum EvalError 

#[non_exhaustive]
pub enum EvalError {
    Io {
        path: Option<PathBuf>,
        source: Error,
    },
    RonParse {
        path: PathBuf,
        source: SpannedError,
    },
    Regex {
        pattern: String,
        source: Error,
    },
    Agent(String),
}

The error type for eval-core’s public API.

#[non_exhaustive] so new fallible paths can add variants without a breaking change. Construct the host-facing variant via EvalError::agent; the I/O / parse / regex variants are produced by ? through the From impls below.

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.

Io

An I/O error reading a case directory or file. Carries the offending path (when known) for a fail-loud message that names what couldn’t be read.

Fields

path: Option<PathBuf>

The path being read when the error occurred, if known.

source: Error

The underlying I/O error.

RonParse

A .ron case file failed to parse. Carries the offending file path so a typo fails loud.

Fields

path: PathBuf

The .ron file that failed to deserialize.

source: SpannedError

The underlying RON deserialization error (with span info).

Regex

A regex in a FinalTextMatches expectation failed to compile.

Fields

pattern: String

The pattern that failed to compile.

source: Error

The underlying regex compilation error.

Agent(String)

The host’s Agent::run (or another host-supplied step) failed. Carries the host’s own error rendered to a string — eval-core stays free of the host’s error types.

Implementations

impl EvalError

pub fn agent(error: impl Display) -> Self

Wrap a host-side run failure (anything Display) as an EvalError::Agent. The canonical way a host’s Agent::run reports a backend/loop failure to the generic runner.

Trait Implementations

impl Debug for EvalError

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

Formats the value using the given formatter.

impl Display for EvalError

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

Formats the value using the given formatter.

impl Error for EvalError

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 From<Error> for EvalError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for EvalError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<SpannedError> for EvalError

fn from(source: SpannedError) -> Self

A bare ron error with no associated path. load_cases builds the path-carrying EvalError::RonParse directly, so this is the fallback for any other call site.