Enum std::env::VarError

pub enum VarError {
    NotPresent,
    NotUnicode(OsString),
}

The error type for operations interacting with environment variables. Possibly returned from the env::var function.

Variants

NotPresent

The specified environment variable was not present in the current process's environment.

NotUnicode(OsString)

The specified environment variable was found, but it did not contain valid unicode data. The found data is returned as a payload of this variant.

Trait Implementations

impl Error for VarError

fn description(&self) -> &str

This method is soft-deprecated.

fn cause(&self) -> Option<&dyn Error>

Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

The lower-level cause of this error, if any.

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

The lower-level source of this error, if any.

fn backtrace(&self) -> Option<&Backtrace>

🔬 This is a nightly-only experimental API. (backtrace #53487)

Returns a stack backtrace, if available, of where this error ocurred.

impl PartialEq<VarError> for VarError

fn eq(&self, other: &VarError) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Eq for VarError

impl Debug for VarError

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

Formats the value using the given formatter.

impl Display for VarError

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

Formats the value using the given formatter.

impl Clone for VarError

fn clone(&self) -> VarError

Returns a copy of the value.

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

Performs copy-assignment from source.