Struct Error

pub struct Error {
    pub kind: ErrorKind,
    pub modules: Trace,
    pub value: Trace,
    /* private fields */
}

Error returned by Merge.

Display

The default Display implementation may not fit into the style of your app.

let r = a.merge(b)
    .value("count")
    .value("settings")
    .module("user.json")
    .module("config.json");

let err = r.unwrap_err();

assert_eq!(err.to_string(),
r#"value collision while evaluating 'settings.count'

    in user.json
  from config.json
"#);

For this reason, the Error type tries to make all relevant information publically accessible. This way you can write another Display implementation that fits more inline with your vision.

Fields

kind: ErrorKind

Error kind.

modules: Trace

Module trace.

This field holds information regarding the module in which the error occurred. It is a Trace containing that module and all parent modules.

value: Trace

Value name.

This field holds the full path of the value which caused the merge error. The path is stored as a list of components and can be accessed as an Iterator.

Implementations

impl Error

pub fn collision() -> Self

Raised when Merge encounters 2 values which cannot be merged using the current strategy.

pub fn cycle() -> Self

Raised when evaluation encounters cyclic imports.

pub fn custom<T>(msg: T) -> Self

where T: Display + Send + Sync + 'static,

Raised when there is a general error when merging 2 values.

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<ErrorKind> for Error

fn from(kind: ErrorKind) -> Self

Converts to this type from the input type.