# 1.29.0[−][src]Struct proc_macro::Group

    pub struct Group(_);

A delimited token stream.

A `Group` internally contains a `TokenStream` which is surrounded by `Delimiter`s.

## Methods

### `impl Group`[src]

#### `pub fn new(delimiter: Delimiter, stream: TokenStream) -> Group`[src]

Creates a new `Group` with the given delimiter and token stream.

This constructor will set the span for this group to `Span::call_site()`. To change the span you can use the `set_span` method below.

#### `pub fn delimiter(&self) -> Delimiter`[src]

Returns the delimiter of this `Group`

#### `pub fn stream(&self) -> TokenStream`[src]

Returns the `TokenStream` of tokens that are delimited in this `Group`.

Note that the returned token stream does not include the delimiter returned above.

#### `pub fn span(&self) -> Span`[src]

Returns the span for the delimiters of this token stream, spanning the entire `Group`.

    pub fn span(&self) -> Span {
               ^^^^^^^

#### `pub fn span_open(&self) -> Span`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_span` #54725)

Returns the span pointing to the opening delimiter of this group.

    pub fn span_open(&self) -> Span {
                    ^

#### `pub fn span_close(&self) -> Span`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_span` #54725)

Returns the span pointing to the closing delimiter of this group.

    pub fn span_close(&self) -> Span {
                           ^

#### `pub fn set_span(&mut self, span: Span)`[src]

Configures the span for this `Group`'s delimiters, but not its internal tokens.

This method will not set the span of all the internal tokens spanned by this group, but rather it will only set the span of the delimiter tokens at the level of the `Group`.

## Trait Implementations

### `impl !Sync for Group`[src]

### `impl ToString for Group` 1.15.0[src]

#### `fn to_string(&self) -> String`[src]

Converts the given value to a `String`. Read more

### `impl Clone for Group`[src]

#### `fn clone(&self) -> Group`[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`1.0.0[src]

Performs copy-assignment from `source`. Read more

### `impl From<Group> for TokenTree`[src]

#### `fn from(g: Group) -> TokenTree`[src]

Performs the conversion.

### `impl !Send for Group`[src]

### `impl Debug for Group`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

### `impl Display for Group`[src]

Prints the group as a string that should be losslessly convertible back into the same group (modulo spans), except for possibly `TokenTree::Group`s with `Delimiter::None` delimiters.

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

## Auto Trait Implementations

### `impl Unpin for Group`

### `impl RefUnwindSafe for Group`

### `impl UnwindSafe for Group`

## Blanket Implementations

### `impl<T> ToString for T where
T: Display + ?Sized,` [src]

#### `default fn to_string(&self) -> String`[src]

Converts the given value to a `String`. Read more

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `fn to_owned(&self) -> T`[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `fn clone_into(&self, target: &mut T)`[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `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>`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

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

The type returned in the event of a conversion error.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)