Enum std::env::VarError1.0.0[−][src]

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

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.

Trait Implementations

impl Clone for VarError[src]

fn clone(&self) -> VarError[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)[src]

Performs copy-assignment from source. Read more

impl Debug for VarError[src]

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

Formats the value using the given formatter. Read more

impl Display for VarError[src]

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

Formats the value using the given formatter. Read more

impl Error for VarError[src]

fn description(&self) -> &str[src]

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more

fn source(&self) -> Option<&(dyn Error + 'static)>1.30.0[src]

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

fn backtrace(&self) -> Option<&Backtrace>[src]

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

Returns a stack backtrace, if available, of where this error occurred. Read more

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

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

impl PartialEq<VarError> for VarError[src]

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

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

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

This method tests for !=.

impl Eq for VarError[src]

impl StructuralEq for VarError[src]

impl StructuralPartialEq for VarError[src]

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> Any for T where
    T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> ToOwned for T where
    T: Clone, [src]

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> ToString for T where
    T: Display + ?Sized, [src]

pub default fn to_string(&self) -> String[src]

Converts the given value to a String. Read more

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

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>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

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>[src]

Performs the conversion.