Enum LoadError 

#[non_exhaustive]
pub enum LoadError {
    NotFound(PathBuf),
    Io {
        path: PathBuf,
        source: Error,
    },
    Parse {
        path: PathBuf,
        source: Box<Error>,
    },
    Validation {
        path: PathBuf,
        source: ConfigError,
    },
    RemovedKey {
        path: PathBuf,
        key: &'static str,
        hint: &'static str,
    },
    ModuleFactory(String),
}

Why loading the configuration failed. Each variant maps to a distinct operator diagnosis (file vs syntax vs semantics).

#[non_exhaustive] (since 0.3, when ModuleFactory was added): new failure kinds can be added without a breaking change — external code matching this enum must carry a _ arm.

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.

NotFound(PathBuf)

The file does not exist — distinct from a present-but-wrong file.

Io

The file exists but could not be read (permissions, etc.).

Fields

path: PathBuf

source: Error

Parse

TOML syntax error or a missing/incorrectly-typed required field (serde reports e.g. “missing field backend”). Boxed: toml::de::Error is large and would bloat every Result otherwise.

Fields

path: PathBuf

source: Box<Error>

Validation

Syntactically valid but semantically invalid (out-of-range, bad CIDR, …).

Fields

path: PathBuf

source: ConfigError

RemovedKey

A removed config key is still present — a clear migration error, never a silent no-op. Carries the offending key and the migration hint.

Fields

path: PathBuf

key: &'static str

hint: &'static str

ModuleFactory(String)

The config itself validated, but rebuilding the injected (embedder) modules failed on reload (core 0.3 ModuleFactory) — e.g. an enterprise schema file became invalid on disk. The reload is aborted and the last-good modules kept; carries the message.

Trait Implementations

impl Debug for LoadError

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

Formats the value using the given formatter.

impl Display for LoadError

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

Formats the value using the given formatter.

impl Error for LoadError

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.