# Pair in syn::punctuated - Rust
A single syntax tree node of type `T` followed by its trailing punctuation of type `P` if any.

syn::punctuated

# Enum Pair

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    pub enum Pair<T, P> {
        Punctuated(T, P),
        End(T),
    }

Expand description

A single syntax tree node of type `T` followed by its trailing punctuation of type `P` if any.

Refer to the module documentation for details about punctuated sequences.

## Variants§

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### Punctuated(T, P)

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### End(T)

## Implementations§

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### impl<T, P> Pair<T, P>

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#### pub fn into_value(self) -> T

Extracts the syntax tree node from this punctuated pair, discarding the following punctuation.

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#### pub fn value(&self) -> &T

Borrows the syntax tree node from this punctuated pair.

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#### pub fn value_mut(&mut self) -> &mut T

Mutably borrows the syntax tree node from this punctuated pair.

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#### pub fn punct(&self) -> Option<&P>

Borrows the punctuation from this punctuated pair, unless this pair is the final one and there is no trailing punctuation.

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#### pub fn punct_mut(&mut self) -> Option<&mut P>

Mutably borrows the punctuation from this punctuated pair, unless the pair is the final one and there is no trailing punctuation.

##### §Example

    punctuated.insert(0, parse_quote!('lifetime));
    if let Some(punct) = punctuated.pairs_mut().next().unwrap().punct_mut() {
        punct.span = span;
    }

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#### pub fn new(t: T, p: Option<P>) -> Self

Creates a punctuated pair out of a syntax tree node and an optional following punctuation.

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#### pub fn into_tuple(self) -> (T, Option<P>)

Produces this punctuated pair as a tuple of syntax tree node and optional following punctuation.

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### impl<T, P> Pair<&T, &P>

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#### pub fn cloned(self) -> Pair<T, P>
where T: Clone, P: Clone,

## Trait Implementations§

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### impl<T, P> Clone for Pair<T, P>
where T: Clone, P: Clone,

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#### fn clone(&self) -> Self

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<T, P> Extend<Pair<T, P>> for Punctuated<T, P>
where P: Default,

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#### fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I)

Extends a collection with the contents of an iterator. Read more
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#### fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (`extend_one`)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one`)
Reserves capacity in a collection for the given number of additional elements. Read more
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### impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P>

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#### fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self

Creates a value from an iterator. Read more
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### impl<T, P> ToTokens for Pair<T, P>
where T: ToTokens, P: ToTokens,

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#### fn to_tokens(&self, tokens: &mut TokenStream)

Write `self` to the given `TokenStream`. Read more
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#### fn to_token_stream(&self) -> TokenStream

Convert `self` directly into a `TokenStream` object. Read more
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#### fn into_token_stream(self) -> TokenStream
where Self: Sized,

Convert `self` directly into a `TokenStream` object. Read more
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### impl<T, P> Copy for Pair<T, P>
where T: Copy, P: Copy,

## Auto Trait Implementations§

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### impl<T, P> Freeze for Pair<T, P>
where T: Freeze, P: Freeze,

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### impl<T, P> RefUnwindSafe for Pair<T, P>
where T: RefUnwindSafe, P: RefUnwindSafe,

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### impl<T, P> Send for Pair<T, P>
where T: Send, P: Send,

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### impl<T, P> Sync for Pair<T, P>
where T: Sync, P: Sync,

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### impl<T, P> Unpin for Pair<T, P>
where T: Unpin, P: Unpin,

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### impl<T, P> UnwindSafe for Pair<T, P>
where T: UnwindSafe, P: UnwindSafe,

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dst`. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> Spanned for T
where T: Spanned + ?Sized,

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#### fn span(&self) -> Span

Returns a `Span` covering the complete contents of this syntax tree node, or `Span::call_site()` if this node is empty.
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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.