# Enum Error

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    #[non_exhaustive]pub enum Error {
        UrlNotSupported,
        NotFound,
        OperationNotSupported,
        Other(Box<dyn StdError + Sync + Send>),
        Unknown,
    }

Expand description

Credential provider error type.

`UrlNotSupported` and `NotFound` errors both cause Cargo to attempt another provider, if one is available. The other variants are fatal.

Note: Do not add a tuple variant, as it cannot be serialized.

## Variants (Non-exhaustive)§

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
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### UrlNotSupported

Registry URL is not supported. This should be used if the provider only works for some registries. Cargo will try another provider, if available

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### NotFound

Credentials could not be found. Cargo will try another provider, if available

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### OperationNotSupported

The provider doesn’t support this operation, such as a provider that can’t support ‘login’ / ‘logout’

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### Other(Box<dyn StdError + Sync + Send>)

The provider failed to perform the operation. Other providers will not be attempted

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### Unknown

A new variant was added to this enum since Cargo was built

## Trait Implementations§

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### impl Debug for Error

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

Formats the value using the given formatter. Read more
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### impl<'de> Deserialize<'de> for Error

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#### fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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### impl Display for Error

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

Formats the value using the given formatter. Read more
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### impl Error for Error

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

Returns the lower-level source of this error, if any. Read more
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#### fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
Read more
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#### fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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#### 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. Read more
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### impl From<&str> for Error

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#### fn from(err: &str) -> Self

Converts to this type from the input type.
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### impl<T: StdError + Send + Sync + 'static> From<Box<T>> for Error

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#### fn from(value: Box<T>) -> Self

Converts to this type from the input type.
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### impl From<Error> for Error

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#### fn from(value: Error) -> Self

Converts to this type from the input type.
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### impl From<String> for Error

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#### fn from(message: String) -> Self

Converts to this type from the input type.
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### impl Serialize for Error

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#### fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more

## Auto Trait Implementations§

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### impl Freeze for Error

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### impl !RefUnwindSafe for Error

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### impl Send for Error

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### impl Sync for Error

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### impl Unpin for Error

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### impl !UnwindSafe for Error

## Blanket Implementations§

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

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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

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#### fn into(self) -> U

Calls `U::from(self)`.

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

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

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#### fn to_string(&self) -> String

Converts the given value to a `String`. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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### impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes

Size for each variant:

- `UrlNotSupported`: 0 bytes
- `NotFound`: 0 bytes
- `OperationNotSupported`: 0 bytes
- `Other`: 16 bytes
- `Unknown`: 0 bytes