Enum std::env::VarError
pub enum VarError {
NotPresent,
NotUnicode(OsString),
}
The error type for operations interacting with environment variables. Possibly returned from env::var().
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.
Tuple Fields of NotUnicode
0: OsStringTrait Implementations
impl Clone for VarError
fn clone(&self) -> VarError
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source. Read more
impl Debug for VarError
fn fmt(&self, f: &mut Formatter<'_>) -> Result
Formats the value using the given formatter. Read more
impl Display for VarError
fn fmt(&self, f: &mut Formatter<'_>) -> Result
Formats the value using the given formatter. Read more
impl Error for VarError
fn description(&self) -> &str
use the Display impl or to_string()
fn source(&self) -> Option<&(dyn Error + 'static)>
The lower-level source of this error, if any. Read more
fn backtrace(&self) -> Option<&Backtrace>
Returns a stack backtrace, if available, of where this error occurred. Read more
fn cause(&self) -> Option<&dyn Error>
replaced by Error::source, which can support downcasting
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 ==. Read more
fn ne(&self, other: &VarError) -> bool
This method tests for !=.
impl Eq for VarError
impl StructuralEq for VarError
impl StructuralPartialEq for VarError
Auto Trait Implementations
impl RefUnwindSafe for VarError
impl Send for VarError
impl Sync for VarError
impl Unpin for VarError
impl UnwindSafe for VarError
Blanket Implementations
impl<T> From<T> for T
pub fn from(t: T) -> T
Performs the conversion.
pub fn into(self) -> U
Performs the conversion.
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
pub fn clone_into(&self, target: &mut T)
toowned_clone_into #41263)recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
Performs the conversion.
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
Performs the conversion.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/env/enum.VarError.html