Enum rocket::mtls::oid::asn1_rs::nom::lib::std::convert::Infallible

1.34.0 · source ·
pub enum Infallible {}
Available on crate feature mtls only.
Expand description

The error type for errors that can never happen.

Since this enum has no variant, a value of this type can never actually exist. This can be useful for generic APIs that use Result and parameterize the error type, to indicate that the result is always Ok.

For example, the TryFrom trait (conversion that returns a Result) has a blanket implementation for all types where a reverse Into implementation exists.

impl<T, U> TryFrom<U> for T where U: Into<T> {
    type Error = Infallible;

    fn try_from(value: U) -> Result<Self, Infallible> {
        Ok(U::into(value))  // Never returns `Err`
    }
}

§Future compatibility

This enum has the same role as the ! “never” type, which is unstable in this version of Rust. When ! is stabilized, we plan to make Infallible a type alias to it:

pub type Infallible = !;

… and eventually deprecate Infallible.

However there is one case where ! syntax can be used before ! is stabilized as a full-fledged type: in the position of a function’s return type. Specifically, it is possible to have implementations for two different function pointer types:

trait MyTrait {}
impl MyTrait for fn() -> ! {}
impl MyTrait for fn() -> std::convert::Infallible {}

With Infallible being an enum, this code is valid. However when Infallible becomes an alias for the never type, the two impls will start to overlap and therefore will be disallowed by the language’s trait coherence rules.

Trait Implementations§

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impl Clone for Infallible

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fn clone(&self) -> Infallible

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Infallible

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

Formats the value using the given formatter. Read more
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impl Display for Infallible

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

Formats the value using the given formatter. Read more
1.8.0 · source§

impl Error for Infallible

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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
1.30.0 · source§

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

The lower-level source of this error, if any. 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<!> for Infallible

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fn from(x: !) -> Infallible

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

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fn from(err: Infallible) -> Error

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

Available on crate feature tls only.
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fn from(v: Infallible) -> Self

Converts to this type from the input type.
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impl From<Infallible> for TryFromIntError

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fn from(x: Infallible) -> TryFromIntError

Converts to this type from the input type.
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impl From<Infallible> for TryFromSliceError

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fn from(x: Infallible) -> TryFromSliceError

Converts to this type from the input type.
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impl From<Infallible> for ValidationError

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fn from(_: Infallible) -> ValidationError

Converts to this type from the input type.
1.44.0 · source§

impl Hash for Infallible

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fn hash<H>(&self, _: &mut H)
where H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for Infallible

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fn cmp(&self, _other: &Infallible) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for Infallible

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fn eq(&self, _: &Infallible) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for Infallible

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fn partial_cmp(&self, _other: &Infallible) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

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

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type Metadata = Infallible

User-provided metadata type.
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fn metadata(&self, _: FormatterOptions) -> Metadata<'_, Infallible>

Compute any information needed to format the value. This must, at a minimum, determine the width of the value before any padding is added by the formatter. Read more
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fn fmt(&self, _: &mut Formatter<'_>) -> Result<(), Error>

Format the value using the given formatter. This is the same as Display::fmt. Read more
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fn fmt_with_metadata( &self, f: &mut Formatter<'_>, _metadata: Metadata<'_, Self> ) -> Result<(), Error>

Format the value using the given formatter and metadata. The formatted output should have the width indicated by the metadata. This is before any padding is added by the formatter. Read more
1.61.0 · source§

impl Termination for Infallible

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fn report(self) -> ExitCode

Is called to get the representation of the value as status code. This status code is returned to the operating system.
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impl Copy for Infallible

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impl Eq for Infallible

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impl RmpReadErr for Infallible

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impl RmpWriteErr for Infallible

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