Enum EnvError 

pub enum EnvError {
    NotSet(String),
    ParseError {
        var: String,
        value: String,
        expected: String,
    },
    Empty(String),
}

Available on crate feature env only.

Error type for environment variable operations.

The expected field in ParseError is populated via std::any::type_name, which is not guaranteed to be stable across compiler versions. It is intended for human-readable diagnostics only — do not match on its string value programmatically.

Variants

NotSet(String)

Variable is not set.

ParseError

Variable value cannot be parsed.

Fields

var: String

value: String

expected: String

Human-readable type name (from std::any::type_name). Not stable across compiler versions — for display only.

Empty(String)

Variable value is empty.

Trait Implementations

impl Clone for EnvError

fn clone(&self) -> EnvError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EnvError

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

Formats the value using the given formatter.

impl Display for EnvError

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

Formats the value using the given formatter.

impl Error for EnvError

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 PartialEq for EnvError

fn eq(&self, other: &EnvError) -> 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 Eq for EnvError

impl StructuralPartialEq for EnvError