Struct std::option::NoneError[][src]

pub struct NoneError;
🔬 This is a nightly-only experimental API. (try_trait #42327)

The error type that results from applying the try operator (?) to a None value. If you wish to allow x? (where x is an Option<T>) to be converted into your error type, you can implement impl From<NoneError> for YourErrorType. In that case, x? within a function that returns Result<_, YourErrorType> will translate a None value into an Err result.

Trait Implementations

impl Hash for NoneError
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Feeds this value into the given [Hasher]. Read more

Feeds a slice of this type into the given [Hasher]. Read more

impl Clone for NoneError
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Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl Debug for NoneError
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Formats the value using the given formatter. Read more

impl PartialOrd<NoneError> for NoneError
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This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl Ord for NoneError
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This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

impl Eq for NoneError
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impl PartialEq<NoneError> for NoneError
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This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl Copy for NoneError
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Auto Trait Implementations

impl Send for NoneError

impl Sync for NoneError