Enum PredicateError 

pub enum PredicateError {
    UnknownKind {
        kind: String,
    },
    Malformed {
        input: String,
        reason: String,
    },
    Resolve {
        source: Box<ResolveError>,
    },
}

Everything that can go wrong while parsing or evaluating a predicate string.

Variants

UnknownKind

A predicate kind that isn’t part of the grammar (e.g. weather:sunny).

Fields

kind: String

The unrecognised kind name (text before the colon).

Malformed

The predicate string is syntactically invalid.

Fields

input: String

The exact input that failed.

reason: String

Why it failed.

Resolve

Variable resolution inside a file_exists: path failed.

Fields

source: Box<ResolveError>

The underlying resolver error.

Trait Implementations

impl Debug for PredicateError

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

Formats the value using the given formatter.

impl Display for PredicateError

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

Formats the value using the given formatter.

impl Error for PredicateError

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<ResolveError> for PredicateError

fn from(e: ResolveError) -> Self

Converts to this type from the input type.