Enum Error 

pub enum Error {
    Usage(String),
    Environment(String),
    Stage(String),
    VtreeSpec(String),
    Input(String),
    Artifact(String),
    Incomplete(String),
}

Everything that stops a run before it has an answer.

The variant is the failure class, which fixes the status the binary exits with and the name the run record gives it (Error::kind). The string says what went wrong, in words an operator can act on; Display prints it, and the binary prints it on stderr after error: .

Variants

Usage(String)

An option is contradictory, or inert in the mode this run resolved to.

Environment(String)

An environment setting is invalid, or is set where this run would ignore it.

Stage(String)

A preprocessing frontend or a compile stage failed.

VtreeSpec(String)

The requested vtree spec cannot serve this run.

Input(String)

The input could not be opened or read, or does not describe a formula.

Artifact(String)

An artifact the run was asked to write could not be produced.

Incomplete(String)

The run ended without a count: it reached its time limit, or every compile and recovery path gave up. The stage that gave up says on stderr what stopped it; the message says which of these ended the run.

Implementations

impl Error

pub fn kind(&self) -> &'static str

The class’s name, as the run record’s exit_reason gives it: usage, environment, stage, vtree-spec, input, artifact or incomplete.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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<GiveUp> for Error

A give-up as the run reports it: a stop or a refusal ends the run without a count, and inputs that do not fit fail the compile stage.

fn from(give_up: GiveUp) -> Self

Converts to this type from the input type.