Trait validators::prelude::validators_prelude::fmt::Display

pub trait Display {
    pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}

Format trait for an empty format, {}.

Display is similar to Debug, but Display is for user-facing output, and so cannot be derived.

For more information on formatters, see the module-level documentation.

Examples

Implementing Display on a type:

use std::fmt;

struct Point {
    x: i32,
    y: i32,
}

impl fmt::Display for Point {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "({}, {})", self.x, self.y)
    }
}

let origin = Point { x: 0, y: 0 };

assert_eq!(format!("The origin is: {}", origin), "The origin is: (0, 0)");

Required methods

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

Formats the value using the given formatter.

Examples

use std::fmt;

struct Position {
    longitude: f32,
    latitude: f32,
}

impl fmt::Display for Position {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "({}, {})", self.longitude, self.latitude)
    }
}

assert_eq!("(1.987, 2.983)",
           format!("{}", Position { longitude: 1.987, latitude: 2.983, }));

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Trait Implementations

impl Trait for dyn Display + 'static + Sync

impl Trait for dyn Display + 'static + Sync + Send

impl Trait for dyn Display + 'static + Send

Implementations on Foreign Types

impl Display for JoinPathsError

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

impl<'a, K, V> Display for OccupiedError<'a, K, V> where
    V: Debug,
    K: Debug, 

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

impl<'_, T> Display for MutexGuard<'_, T> where
    T: Display + ?Sized, 

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

impl<T> Display for PoisonError<T>

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

impl Display for Backtrace

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

impl Display for NulError

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

impl Display for SocketAddr

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

impl<T> Display for TryLockError<T>

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

impl<T> Display for SendError<T>

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

impl Display for SystemTimeError

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

impl Display for AddrParseError

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

impl<W> Display for IntoInnerError<W>

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

impl Display for VarError

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

impl Display for IntoStringError

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

impl Display for RecvTimeoutError

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

impl<T> Display for TrySendError<T>

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

impl<'_, T> Display for RwLockWriteGuard<'_, T> where
    T: Display + ?Sized, 

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

impl Display for TryRecvError

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

impl Display for FromVecWithNulError

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

impl Display for RecvError

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

impl Display for Error

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

impl<'_, T> Display for RwLockReadGuard<'_, T> where
    T: Display + ?Sized, 

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

impl Display for FromBytesWithNulError

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

impl Display for SocketAddrV6

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

impl Display for AccessError

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

impl Display for SocketAddrV4

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

impl Display for ExitStatus

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

impl<'_> Display for Display<'_>

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

impl Display for StripPrefixError

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

impl Display for NonZeroI16

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

impl Display for NonZeroU32

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

impl Display for BorrowMutError

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

impl Display for bool

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

impl Display for u64

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

impl Display for char

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

impl<'a> Display for EscapeUnicode<'a>

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

impl<'a> Display for EscapeDebug<'a>

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

impl Display for i32

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

impl Display for u8

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

impl Display for EscapeDebug

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

impl<T> Display for Wrapping<T> where
    T: Display, 

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

impl Display for Utf8Lossy

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

impl Display for AllocError

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

impl Display for NonZeroI128

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

impl Display for NonZeroU64

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

impl Display for NonZeroUsize

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

impl Display for NonZeroU8

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

impl Display for NonZeroU128

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

impl Display for ParseBoolError

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

impl Display for i16

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

impl Display for u16

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

impl Display for u32

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

impl Display for EscapeUnicode

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

impl Display for NonZeroI8

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

impl Display for NonZeroU16

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

impl Display for EscapeDefault

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

impl<'_, T> Display for &'_ mut T where
    T: Display + ?Sized, 

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

impl Display for ToUppercase

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

impl Display for ToLowercase

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

impl Display for NonZeroIsize

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

impl Display for DecodeUtf16Error

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

impl<P> Display for Pin<P> where
    P: Display, 

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

impl Display for !

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

impl Display for ParseIntError

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

impl<'_, T> Display for Ref<'_, T> where
    T: Display + ?Sized, 

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

impl Display for LayoutError

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

impl Display for str

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

impl<'_, T> Display for &'_ T where
    T: Display + ?Sized, 

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

impl Display for Infallible

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

impl Display for i8

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

impl Display for isize

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

impl Display for i128

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

impl Display for NonZeroI32

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

impl Display for usize

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

impl<'_> Display for PanicInfo<'_>

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

impl Display for BorrowError

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

impl Display for f32

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

impl Display for f64

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

impl Display for NonZeroI64

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

impl<'_> Display for Location<'_>

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

impl Display for Utf8Error

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

impl Display for CharTryFromError

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

impl<'a> Display for EscapeAscii<'a>

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

impl Display for ParseCharError

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

impl Display for TryFromSliceError

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

impl Display for EscapeDefault

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

impl Display for u128

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

impl Display for TryFromIntError

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

impl Display for ParseFloatError

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

impl<'_, T> Display for RefMut<'_, T> where
    T: Display + ?Sized, 

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

impl<'a> Display for EscapeDefault<'a>

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

impl Display for i64

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

impl Display for FromUtf8Error

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

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

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

impl<'a, K, V> Display for OccupiedError<'a, K, V> where
    V: Debug,
    K: Debug + Ord, 

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

impl<T, A> Display for Box<T, A> where
    T: Display + ?Sized,
    A: Allocator, 

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

impl Display for TryReserveError

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

impl Display for FromUtf16Error

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

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

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

impl Display for DecodeKind

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

impl Display for DecodeError

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

impl Display for SpecificationError

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

impl Display for Errors

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

impl<I> Display for Replacements<I> where
    I: Iterator<Item = char> + Clone, 

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

impl<I> Display for Recompositions<I> where
    I: Iterator<Item = char> + Clone, 

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

impl<I> Display for Decompositions<I> where
    I: Iterator<Item = char> + Clone, 

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

impl<'s, T> Display for SliceVec<'s, T> where
    T: Display, 

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

impl<A> Display for ArrayVec<A> where
    A: Array,
    <A as Array>::Item: Display, 

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

impl<A> Display for TinyVec<A> where
    A: Array,
    <A as Array>::Item: Display, 

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

impl Display for Error

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

impl Display for Number

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

impl Display for Value

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

Display a JSON value as a string.

let json = json!({ "city": "London", "street": "10 Downing Street" });

// Compact format:
//
// {"city":"London","street":"10 Downing Street"}
let compact = format!("{}", json);
assert_eq!(compact,
    "{\"city\":\"London\",\"street\":\"10 Downing Street\"}");

// Pretty format:
//
// {
//   "city": "London",
//   "street": "10 Downing Street"
// }
let pretty = format!("{:#}", json);
assert_eq!(pretty,
    "{\n  \"city\": \"London\",\n  \"street\": \"10 Downing Street\"\n}");

impl<'a> Display for dyn Expected + 'a

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

impl Display for Error

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

impl<'a> Display for Unexpected<'a>

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

impl Display for Parse

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

impl Display for PhoneNumber

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

impl Display for Metadata

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

impl Display for NationalNumber

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

impl<'n, 'd, 'f> Display for Formatter<'n, 'd, 'f>

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

impl Display for Carrier

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

impl Display for Extension

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

impl<E> Display for Err<E> where
    E: Debug, 

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

impl Display for Error

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

impl<A> Display for ArrayString<A> where
    A: Array<Item = u8> + Copy, 

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

impl<T> Display for CapacityError<T>

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

impl Display for Regex

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

Shows the original regular expression.

impl Display for Error

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

impl Display for Regex

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

Shows the original regular expression.

impl Display for Error

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

impl Display for Error

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

impl Display for ErrorKind

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

impl Display for CaseFoldError

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

impl Display for UnicodeWordError

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

impl Display for Error

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

impl Display for Ast

Print a display representation of this Ast.

This does not preserve any of the original whitespace formatting that may have originally been present in the concrete syntax from which this Ast was generated.

This implementation uses constant stack space and heap space proportional to the size of the Ast.

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

impl Display for ErrorKind

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

impl Display for Error

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

impl Display for Hir

Print a display representation of this Hir.

The result of this is a valid regular expression pattern string.

This implementation uses constant stack space and heap space proportional to the size of the Hir.

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

impl Display for CachedRegex

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

impl Display for LazyRegex

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

impl Display for Error

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

impl<'a, I, F> Display for FormatWith<'a, I, F> where
    I: Iterator,
    F: FnMut(<I as Iterator>::Item, &mut dyn FnMut(&dyn Display)) -> Result<(), Error>, 

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

impl<'a, I> Display for Format<'a, I> where
    I: Iterator,
    <I as Iterator>::Item: Display, 

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

impl<L, R> Display for Either<L, R> where
    R: Display,
    L: Display, 

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

impl Display for ErrorKind

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

impl Display for Version

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

impl Display for SemVerError

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

impl Display for ReqParseError

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

impl Display for VersionReq

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

impl Display for Identifier

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

impl<'input> Display for Error<'input>

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

impl Display for Identifier

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

impl Display for Version

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

impl<'i, R> Display for Pairs<'i, R> where
    R: RuleType, 

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

impl<'i, R> Display for Pair<'i, R> where
    R: RuleType, 

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

impl<R> Display for Error<R> where
    R: RuleType, 

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

impl Display for Error

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

impl Display for Url

Display the serialization of this URL.

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

impl Display for SyntaxViolation

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

impl Display for ParseError

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

impl<S> Display for Host<S> where
    S: AsRef<str>, 

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

impl<'a> Display for PercentEncode<'a>

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

impl<S> Display for Ascii<S> where
    S: Display, 

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

impl<S> Display for UniCase<S> where
    S: Display, 

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

impl<'r> Display for Request<'r>

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

Pretty prints a Request. This is primarily used by Rocket’s logging infrastructure.

impl Display for Route

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

impl Display for Environment

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

impl Display for ConfigError

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

impl Display for RouteUriError

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

impl Display for LaunchError

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

impl Display for Catcher

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

impl<S, E, F> Display for Outcome<S, E, F>

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

impl Display for LoggingLevel

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

impl Display for Limits

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

impl Display for LaunchErrorKind

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

impl<'h> Display for Header<'h>

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

impl<'s> Display for Uncased<'s>

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

impl Display for MediaType

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

impl<'a, P> Display for &'a (dyn UriDisplay<P> + 'a) where
    P: UriPart, 

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

impl<'a> Display for Absolute<'a>

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

impl<'a> Display for Authority<'a>

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

impl<'a> Display for Origin<'a>

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

impl<'a> Display for Error<'a>

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

impl Display for Accept

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

impl Display for ContentType

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

Formats the ContentType as an HTTP Content-Type value.

Example

use rocket::http::ContentType;

let ct = format!("{}", ContentType::JSON);
assert_eq!(ct, "application/json");

impl<'a> Display for Uri<'a>

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

impl Display for Method

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

impl Display for UncasedStr

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

impl<T, I, S> Display for Expected<T, I, S> where
    S: Display + Debug,
    T: Display + Debug,
    I: Display + Debug, 

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

impl<T, I, S> Display for Expected<T, I, S> where
    S: Debug,
    T: Debug,
    I: Debug, 

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

impl<'a> Display for Position<'a>

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

impl<I> Display for ParseErr<I> where
    I: Input,
    <I as Input>::Token: Debug,
    <I as Input>::Token: Display,
    <I as Input>::Slice: Display,
    <I as Input>::Slice: Debug,
    <I as Input>::InSlice: Display,
    <I as Input>::InSlice: Debug, 

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

impl<I> Display for ParseErr<I> where
    I: Input,
    <I as Input>::Token: Debug,
    <I as Input>::Slice: Debug,
    <I as Input>::InSlice: Debug, 

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

impl<'a, E> Display for PercentEncode<'a, E> where
    E: EncodeSet, 

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

impl Display for CollectionAllocErr

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

impl<'c> Display for Cookie<'c>

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

Formats the cookie self as a Set-Cookie header value.

Example

use cookie::Cookie;

let mut cookie = Cookie::build("foo", "bar")
    .path("/")
    .finish();

assert_eq!(&cookie.to_string(), "foo=bar; Path=/");

impl<'a, 'c> Display for EncodedCookie<'a, 'c> where
    'c: 'a, 

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

impl Display for ParseError

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

impl Display for SameSite

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

impl<'a> Display for TmFmt<'a>

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

impl Display for ParseError

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

impl Display for SteadyTime

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

impl Display for OutOfRangeError

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

impl Display for Duration

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

impl Display for BernoulliError

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

impl Display for ReadError

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

impl Display for WeightedError

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

impl Display for Error

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

impl Display for Error

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

impl Display for DecodeError

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

impl<'a> Display for Base64Display<'a>

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

impl Display for Error

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

impl Display for OverflowError

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

impl Display for LoopError

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

impl Display for InvalidKeyLength

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

impl Display for InvalidKeyNonceLength

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

impl Display for Error

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

impl Display for InvalidOutputSize

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

impl Display for InvalidKeyLength

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

impl Display for MacError

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

impl Display for InvalidPrkLength

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

impl Display for InvalidLength

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

impl Display for IfUnmodifiedSince

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

impl Display for EntityTag

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

impl Display for AcceptRanges

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

impl Display for ContentRangeSpec

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

impl Display for AccessControlMaxAge

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

impl Display for Prefer

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

impl Display for MediaDesc

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

impl Display for IfNoneMatch

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

impl Display for AcceptCharset

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

impl Display for RelationType

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

impl Display for StatusCode

Formats the status code, including the canonical reason.

assert_eq!(format!("{}", ImATeapot), "418 I'm a teapot");
assert_eq!(format!("{}", Unregistered(123)),
           "123 <unknown status code>");

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

impl Display for ReferrerPolicy

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

impl Display for Upgrade

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

impl Display for Headers

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

impl Display for IfMatch

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

impl Display for AccessControlAllowHeaders

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

impl Display for Origin

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

impl Display for Location

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

impl Display for ETag

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

impl Display for AccessControlRequestHeaders

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

impl Display for From

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

impl Display for Quality

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

impl Display for ExtendedValue

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

impl Display for AcceptEncoding

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

impl Display for Allow

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

impl Display for Connection

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

impl Display for LinkValue

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

impl Display for AccessControlExposeHeaders

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

impl Display for Referer

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

impl Display for Preference

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

impl<'a> Display for &'a (dyn HeaderFormat + 'static + Sync + Send)

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

impl Display for RangeUnit

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

impl Display for ContentLength

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

impl Display for Expect

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

impl Display for ConnectionOption

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

impl Display for AccessControlAllowCredentials

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

impl Display for ContentEncoding

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

impl Display for Method

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

impl Display for RequestUri

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

impl Display for ContentType

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

impl Display for AccessControlAllowMethods

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

impl Display for ByteRangeSpec

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

impl Display for Pragma

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

impl Display for IfRange

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

impl Display for HttpVersion

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

impl Display for Link

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

impl Display for StrictTransportSecurity

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

impl Display for Protocol

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

impl Display for UserAgent

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

impl Display for Expires

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

impl Display for AccessControlRequestMethod

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

impl Display for ContentDisposition

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

impl Display for Vary

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

impl Display for ProtocolName

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

impl Display for HttpDate

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

impl Display for ContentLanguage

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

impl Display for CacheDirective

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

impl Display for AcceptLanguage

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

impl Display for Range

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

impl Display for PreferenceApplied

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

impl<'a> Display for HeaderView<'a>

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

impl Display for Date

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

impl<T> Display for QualityItem<T> where
    T: Display, 

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

impl Display for ContentRange

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

impl Display for Charset

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

impl Display for Error

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

impl Display for Encoding

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

impl Display for LastModified

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

impl Display for Server

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

impl<'a, H> Display for HeaderFormatter<'a, H> where
    H: HeaderFormat, 

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

impl Display for AccessControlAllowOrigin

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

impl Display for CacheControl

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

impl Display for IfModifiedSince

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

impl Display for Accept

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

impl Display for Host

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

impl Display for TransferEncoding

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

impl Display for DecodeError

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

impl<'a> Display for Base64Display<'a>

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

impl Display for SyntaxViolation

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

impl Display for Url

Display the serialization of this URL.

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

impl<S> Display for Host<S> where
    S: AsRef<str>, 

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

impl Display for ParseError

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

impl<S> Display for HostAndPort<S> where
    S: AsRef<str>, 

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

impl<S> Display for UniCase<S> where
    S: Display, 

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

impl Display for InvalidChunkSize

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

impl Display for Error

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

impl Display for Error

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

impl Display for LanguageTag

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

impl<T> Display for Mime<T> where
    T: AsRef<[(Attr, Value)]>, 

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

impl Display for TopLevel

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

impl Display for SubLevel

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

impl Display for Value

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

impl Display for Attr

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

impl Display for LogLevel

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

impl Display for SetLoggerError

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

impl Display for LogLevelFilter

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

impl Display for ShutdownLoggerError

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

impl Display for SetLoggerError

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

impl Display for Level

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

impl Display for LevelFilter

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

impl Display for ParseLevelError

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

impl<T> Display for Paint<T> where
    T: Display, 

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

impl Display for Datetime

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

impl Display for Error

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

impl Display for DatetimeParseError

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

impl Display for Error

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

impl Display for Value

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

impl<'a> Display for Base64Display<'a>

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

impl Display for DecodeError

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

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Implementors

impl Display for Base32DecodedError

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

impl Display for Base32Error

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

impl Display for Base64DecodedError

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

impl Display for Base64Error

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

impl Display for Base64UrlDecodedError

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

impl Display for Base64UrlError

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

impl Display for DomainError

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

impl Display for EmailError

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

impl Display for HostError

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

impl Display for HttpFtpURLError

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

impl Display for HttpURLError

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

impl Display for IPError

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

impl Display for IPv4Error

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

impl Display for IPv6Error

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

impl Display for IpAddr

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

impl Display for JSONError

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

impl Display for LengthError

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

impl Display for LineError

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

impl Display for MacAddressError

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

impl Display for NumberError

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

impl Display for PhoneError

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

impl Display for SignedIntegerError

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

impl Display for TextError

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

impl Display for UUIDError

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

impl Display for UnsignedIntegerError

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

impl Display for BooleanError

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

impl Display for Ipv4Addr

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

impl Display for Ipv6Addr

Write an Ipv6Addr, conforming to the canonical style described by RFC 5952.

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

impl Display for RawStr

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

impl Display for RegexError

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

impl Display for validators::prelude::validators_prelude::SemVerError

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

impl Display for SemVerReqError

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

impl Display for Status

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

impl Display for String

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

impl Display for URLError

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

impl Display for validators::prelude::validators_prelude::fmt::Error

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

impl<'_> Display for Arguments<'_>

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

impl<'_, B> Display for Cow<'_, B> where
    B: Display + ToOwned + ?Sized,
    <B as ToOwned>::Owned: Display, 

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

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