Enum std::env::VarError

1.0.0 · source · [−]

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

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fn clone(&self) -> VarError

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Returns a copy of the value. Read more

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

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Performs copy-assignment from source. Read more

impl Debug for VarError

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

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Formats the value using the given formatter. Read more

impl Display for VarError

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

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Formats the value using the given formatter. Read more

impl Error for VarError

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fn description(&self) -> &str

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👎 Deprecated since 1.42.0:

use the Display impl or to_string()

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

1.30.0 · source

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

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

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🔬 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>

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👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

impl PartialEq<VarError> for VarError

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

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

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

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This method tests for !=.

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,

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fn type_id(&self) -> TypeId

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Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
T: ?Sized,

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fn borrow(&self) -> &T

const: unstable · source

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

const: unstable · source

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

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fn from(t: T) -> T

const: unstable · source

Returns the argument unchanged.

impl<T, U> Into for T where
U: From<T>,

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fn into(self) -> U

const: unstable · source

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> ToOwned for T where
T: Clone,

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type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

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

fn clone_into(&self, target: &mut T)

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

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

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

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default fn to_string(&self) -> String

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Converts the given value to a String. Read more

impl<T, U> TryFrom for T where
U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

const: unstable · source

Performs the conversion.

impl<T, U> TryInto for T where
U: TryFrom<T>,

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type Error = >::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, >::Error>

const: unstable · source

Performs the conversion.

Enum std::env::VarError

Variants

NotPresent

NotUnicode(OsString)

Trait Implementations

impl Clone for VarError

fn clone(&self) -> VarError

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

impl Debug for VarError

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

impl Display for VarError

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

impl Error for VarError

fn description(&self) -> &str

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

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

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

impl PartialEq<VarError> for VarError

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

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

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

fn into(self) -> U

impl<T> ToOwned for T where T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

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

default fn to_string(&self) -> String

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

`NotPresent`

`NotUnicode(OsString)`

impl<T> Any for T where
T: 'static + ?Sized,

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T, U> Into<U> for T where
U: From<T>,

impl<T> ToOwned for T where
T: Clone,

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

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,