Enum FeatureFlagError 

pub enum FeatureFlagError {
    Parse(Error),
    Io {
        path: PathBuf,
        source: Error,
    },
    Invalid(String),
    UnknownFlag(String),
}

Anything that can go wrong inside the crate.

Variants

Parse(Error)

Failed to parse a JSON flagset.

Io

Failed to read a flagset file.

Fields

path: PathBuf

Path the caller was reading.

source: Error

Underlying io error.

Invalid(String)

The flagset is structurally valid but invalid as a logical config (e.g. a rollout that totals > 100, a variant referenced from a rule that doesn’t appear in the flag’s variants list).

UnknownFlag(String)

Asked to evaluate a flag that isn’t in the loaded flagset. The caller’s default value is returned via the Evaluation::Default outcome.

Trait Implementations

impl Debug for FeatureFlagError

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

Formats the value using the given formatter.

impl Display for FeatureFlagError

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

Formats the value using the given formatter.

impl Error for FeatureFlagError

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 FeatureFlagError

fn from(source: Error) -> Self

Converts to this type from the input type.