Struct LookupError 

pub struct LookupError<E> {
    pub var_name: String,
    pub cause: E,
}

Represents a variable lookup error.

This error is returned by env_with_context() function (and, therefore, also by env(), full_with_context() and full()) when the provided context function returns an error. The original error is provided in the cause field, while name contains the name of a variable whose expansion caused the error.

Fields

var_name: String

The name of the problematic variable inside the input string.

cause: E

The original error returned by the context function.

Trait Implementations

impl<E> Clone for LookupError<E>

where E: Clone,

fn clone(&self) -> LookupError<E>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<E> Debug for LookupError<E>

where E: Debug,

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

Formats the value using the given formatter.

impl<E> Display for LookupError<E>

where E: Display,

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

Formats the value using the given formatter.

impl<E> Error for LookupError<E>

where E: Error,

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 source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

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<E> PartialEq for LookupError<E>

where E: PartialEq,

fn eq(&self, other: &LookupError<E>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<E> Eq for LookupError<E>

where E: Eq,

impl<E> StructuralPartialEq for LookupError<E>