Struct core::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 Clone for NoneError
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

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

1.0.0
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This method tests for !=.

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

1.0.0
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This method tests less than (for self and other) and is used by the < operator. Read more

1.0.0
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

1.0.0
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This method tests greater than (for self and other) and is used by the > operator. Read more

1.0.0
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

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

1.21.0
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Compares and returns the maximum of two values. Read more

1.21.0
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Compares and returns the minimum of two values. Read more

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

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

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more