[−][src]Struct lexpr::parse::Parser
Parser for the S-expression text representation.
This type, given a input source, provides the parse
method,
which can be used to read a single S-expression from the input
source.
Methods
impl<'de, R> Parser<R> where
R: Read<'de>,
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R: Read<'de>,
pub fn new(read: R) -> Self
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Create an S-expression parser from one of the possible sexpr input sources.
Typically it is more convenient to use one of these methods instead:
Parser::from_str
Parser::from_slice
Parser::from_reader
pub fn with_options(read: R, options: Options) -> Self
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Create a customized S-expression parser parser from one of the possible sexpr input sources.
Typically it is more convenient to use one of these methods instead:
Parser::from_str_custom
Parser::from_slice_custom
Parser::from_reader_custom
impl<R> Parser<IoRead<R>> where
R: Read,
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R: Read,
pub fn from_reader(reader: R) -> Self
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Creates an S-expression parser from an io::Read
.
pub fn from_reader_custom(reader: R, options: Options) -> Self
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Creates an S-expression parser from an io::Read
.
impl<'a> Parser<SliceRead<'a>>
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pub fn from_slice(bytes: &'a [u8]) -> Self
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Creates an S-expression parser from a &[u8]
.
pub fn from_slice_custom(bytes: &'a [u8], options: Options) -> Self
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Creates an S-expression parser from a &[u8]
.
impl<'a> Parser<StrRead<'a>>
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pub fn from_str(s: &'a str) -> Self
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Creates a S-expression parser from a &str
.
pub fn from_str_custom(s: &'a str, options: Options) -> Self
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Creates a S-expression parser from a &str
.
impl<'de, R: Read<'de>> Parser<R>
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pub fn expect_end(&mut self) -> Result<()>
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Expect the end of input.
The Parser::expect_end
method should be called after the last
S-expression has been consumed. This allows the parser` to validate
that the input stream is at the end or that it only has trailing
whitespace.
pub fn end(&mut self) -> Result<()>
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Please use the expect_end
method instead
Expect the end of input.
pub fn value_iter(&mut self) -> ValueIter<R>
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Obtain an iterator over the values produced by the parser.
let mut parser = Parser::from_str(r#"foo ("bar" . 3.14) #:baz (1 2 3)"#); for value in parser.value_iter() { println!("parsed value: {}", value.expect("parse error")); }
pub fn datum_iter(&mut self) -> DatumIter<R>
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Obtain an iterator over the values produced by the parser, including location information.
use lexpr::Parser;
let mut parser = Parser::from_str(r#"foo ("bar" . 3.14) #:baz (1 2 3)"#); for datum in parser.datum_iter() { let datum = datum.expect("parse error"); let span = datum.span(); let start = span.start(); let end = span.end(); println!("parsed datum at {}:{}--{}:{}: {}", start.line(), start.column(), end.start(), end.column(), datum.value()); }
pub fn parse_value(&mut self) -> Result<Value>
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Please use the expect_value
method instead
Parse a single S-expression from the input source.
pub fn expect_value(&mut self) -> Result<Value>
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Parse a single S-expression from the input source.
This expects an S-expression value to be actually present, and
returns an Err
when called at the end of input. Use
Parser::value_iter()
if you need to handle end of input gracefully.
let mut parser = Parser::from_str(r#"foo ("bar" . 3.14) #:baz (1 2 3)"#); assert_eq!(parser.expect_value().unwrap(), sexp!(foo)); assert_eq!(parser.expect_value().unwrap(), sexp!(("bar" . 3.14))); assert_eq!(parser.expect_value().unwrap(), sexp!(#:baz)); assert_eq!(parser.expect_value().unwrap(), sexp!((1 2 3))); assert!(parser.expect_end().is_ok());
pub fn next_value(&mut self) -> Result<Option<Value>>
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Parse an S-expression, returning None
on end-of-input.
For consuming the entire sequence of parsed S-expression values, the
value_iter
method may be more convenient than calling this method in a
loop.
pub fn parse(&mut self) -> Result<Option<Value>>
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Please use the next_value
method instead
Parse a single S-expression from the input source.
pub fn expect_datum(&mut self) -> Result<Datum>
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Parse a single S-expression including location information, returning an error on end-of-input.
pub fn next_datum(&mut self) -> Result<Option<Datum>>
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Parse a single S-expression including location information.
When end of input is reached, None
is returned.
For consuming the entire sequence of parsed S-expression datums, the
datum_iter
method may be more convenient than calling this method in a
loop.
Trait Implementations
impl<'de, R: Read<'de>> Iterator for Parser<R>
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type Item = Result<Value>
The type of the elements being iterated over.
fn next(&mut self) -> Option<Self::Item>
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fn size_hint(&self) -> (usize, Option<usize>)
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fn count(self) -> usize
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fn last(self) -> Option<Self::Item>
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fn nth(&mut self, n: usize) -> Option<Self::Item>
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fn step_by(self, step: usize) -> StepBy<Self>
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fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter> where
U: IntoIterator<Item = Self::Item>,
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U: IntoIterator<Item = Self::Item>,
fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter> where
U: IntoIterator,
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U: IntoIterator,
fn map<B, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> B,
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F: FnMut(Self::Item) -> B,
fn for_each<F>(self, f: F) where
F: FnMut(Self::Item),
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F: FnMut(Self::Item),
fn filter<P>(self, predicate: P) -> Filter<Self, P> where
P: FnMut(&Self::Item) -> bool,
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P: FnMut(&Self::Item) -> bool,
fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> where
F: FnMut(Self::Item) -> Option<B>,
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F: FnMut(Self::Item) -> Option<B>,
fn enumerate(self) -> Enumerate<Self>
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fn peekable(self) -> Peekable<Self>
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fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> where
P: FnMut(&Self::Item) -> bool,
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P: FnMut(&Self::Item) -> bool,
fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> where
P: FnMut(&Self::Item) -> bool,
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P: FnMut(&Self::Item) -> bool,
fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P> where
P: FnMut(Self::Item) -> Option<B>,
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P: FnMut(Self::Item) -> Option<B>,
fn skip(self, n: usize) -> Skip<Self>
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fn take(self, n: usize) -> Take<Self>
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fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> where
F: FnMut(&mut St, Self::Item) -> Option<B>,
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F: FnMut(&mut St, Self::Item) -> Option<B>,
fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> where
F: FnMut(Self::Item) -> U,
U: IntoIterator,
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F: FnMut(Self::Item) -> U,
U: IntoIterator,
fn flatten(self) -> Flatten<Self> where
Self::Item: IntoIterator,
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Self::Item: IntoIterator,
fn fuse(self) -> Fuse<Self>
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fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item),
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F: FnMut(&Self::Item),
fn by_ref(&mut self) -> &mut Self
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#[must_use =
"if you really need to exhaust the iterator, consider `.for_each(drop)` instead"]fn collect<B>(self) -> B where
B: FromIterator<Self::Item>,
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B: FromIterator<Self::Item>,
fn partition<B, F>(self, f: F) -> (B, B) where
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
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B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
fn partition_in_place<'a, T, P>(self, predicate: P) -> usize where
P: FnMut(&T) -> bool,
Self: DoubleEndedIterator<Item = &'a mut T>,
T: 'a,
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P: FnMut(&T) -> bool,
Self: DoubleEndedIterator<Item = &'a mut T>,
T: 'a,
fn is_partitioned<P>(self, predicate: P) -> bool where
P: FnMut(Self::Item) -> bool,
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P: FnMut(Self::Item) -> bool,
fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R where
F: FnMut(B, Self::Item) -> R,
R: Try<Ok = B>,
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F: FnMut(B, Self::Item) -> R,
R: Try<Ok = B>,
fn try_for_each<F, R>(&mut self, f: F) -> R where
F: FnMut(Self::Item) -> R,
R: Try<Ok = ()>,
1.27.0[src]
F: FnMut(Self::Item) -> R,
R: Try<Ok = ()>,
fn fold<B, F>(self, init: B, f: F) -> B where
F: FnMut(B, Self::Item) -> B,
1.0.0[src]
F: FnMut(B, Self::Item) -> B,
fn fold_first<F>(self, f: F) -> Option<Self::Item> where
F: FnMut(Self::Item, Self::Item) -> Self::Item,
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F: FnMut(Self::Item, Self::Item) -> Self::Item,
fn all<F>(&mut self, f: F) -> bool where
F: FnMut(Self::Item) -> bool,
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F: FnMut(Self::Item) -> bool,
fn any<F>(&mut self, f: F) -> bool where
F: FnMut(Self::Item) -> bool,
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F: FnMut(Self::Item) -> bool,
fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where
P: FnMut(&Self::Item) -> bool,
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P: FnMut(&Self::Item) -> bool,
fn find_map<B, F>(&mut self, f: F) -> Option<B> where
F: FnMut(Self::Item) -> Option<B>,
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F: FnMut(Self::Item) -> Option<B>,
fn try_find<F, E, R>(&mut self, f: F) -> Result<Option<Self::Item>, E> where
F: FnMut(&Self::Item) -> R,
R: Try<Ok = bool, Error = E>,
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F: FnMut(&Self::Item) -> R,
R: Try<Ok = bool, Error = E>,
fn position<P>(&mut self, predicate: P) -> Option<usize> where
P: FnMut(Self::Item) -> bool,
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P: FnMut(Self::Item) -> bool,
fn rposition<P>(&mut self, predicate: P) -> Option<usize> where
P: FnMut(Self::Item) -> bool,
Self: ExactSizeIterator + DoubleEndedIterator,
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P: FnMut(Self::Item) -> bool,
Self: ExactSizeIterator + DoubleEndedIterator,
fn max(self) -> Option<Self::Item> where
Self::Item: Ord,
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Self::Item: Ord,
fn min(self) -> Option<Self::Item> where
Self::Item: Ord,
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Self::Item: Ord,
fn max_by_key<B, F>(self, f: F) -> Option<Self::Item> where
B: Ord,
F: FnMut(&Self::Item) -> B,
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B: Ord,
F: FnMut(&Self::Item) -> B,
fn max_by<F>(self, compare: F) -> Option<Self::Item> where
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
1.15.0[src]
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn min_by_key<B, F>(self, f: F) -> Option<Self::Item> where
B: Ord,
F: FnMut(&Self::Item) -> B,
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B: Ord,
F: FnMut(&Self::Item) -> B,
fn min_by<F>(self, compare: F) -> Option<Self::Item> where
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
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F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn rev(self) -> Rev<Self> where
Self: DoubleEndedIterator,
1.0.0[src]
Self: DoubleEndedIterator,
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB) where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Iterator<Item = (A, B)>,
1.0.0[src]
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Iterator<Item = (A, B)>,
fn copied<'a, T>(self) -> Copied<Self> where
Self: Iterator<Item = &'a T>,
T: 'a + Copy,
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Self: Iterator<Item = &'a T>,
T: 'a + Copy,
fn cloned<'a, T>(self) -> Cloned<Self> where
Self: Iterator<Item = &'a T>,
T: 'a + Clone,
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Self: Iterator<Item = &'a T>,
T: 'a + Clone,
fn cycle(self) -> Cycle<Self> where
Self: Clone,
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Self: Clone,
fn sum<S>(self) -> S where
S: Sum<Self::Item>,
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S: Sum<Self::Item>,
fn product<P>(self) -> P where
P: Product<Self::Item>,
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P: Product<Self::Item>,
fn cmp<I>(self, other: I) -> Ordering where
I: IntoIterator<Item = Self::Item>,
Self::Item: Ord,
1.5.0[src]
I: IntoIterator<Item = Self::Item>,
Self::Item: Ord,
fn cmp_by<I, F>(self, other: I, cmp: F) -> Ordering where
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Ordering,
I: IntoIterator,
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F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Ordering,
I: IntoIterator,
fn partial_cmp<I>(self, other: I) -> Option<Ordering> where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
1.5.0[src]
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering> where
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,
I: IntoIterator,
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F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,
I: IntoIterator,
fn eq<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
1.5.0[src]
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
fn eq_by<I, F>(self, other: I, eq: F) -> bool where
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> bool,
I: IntoIterator,
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F: FnMut(Self::Item, <I as IntoIterator>::Item) -> bool,
I: IntoIterator,
fn ne<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
1.5.0[src]
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
fn lt<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
1.5.0[src]
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
fn le<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
1.5.0[src]
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
fn gt<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
1.5.0[src]
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
fn ge<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
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I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
fn is_sorted(self) -> bool where
Self::Item: PartialOrd<Self::Item>,
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Self::Item: PartialOrd<Self::Item>,
fn is_sorted_by<F>(self, compare: F) -> bool where
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
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F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
fn is_sorted_by_key<F, K>(self, f: F) -> bool where
F: FnMut(Self::Item) -> K,
K: PartialOrd<K>,
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F: FnMut(Self::Item) -> K,
K: PartialOrd<K>,
Auto Trait Implementations
impl<R> RefUnwindSafe for Parser<R> where
R: RefUnwindSafe,
R: RefUnwindSafe,
impl<R> Send for Parser<R> where
R: Send,
R: Send,
impl<R> Sync for Parser<R> where
R: Sync,
R: Sync,
impl<R> Unpin for Parser<R> where
R: Unpin,
R: Unpin,
impl<R> UnwindSafe for Parser<R> where
R: UnwindSafe,
R: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<I> IntoIterator for I where
I: Iterator,
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I: Iterator,
type Item = <I as Iterator>::Item
The type of the elements being iterated over.
type IntoIter = I
Which kind of iterator are we turning this into?
fn into_iter(self) -> I
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,