Expand description
A braced block containing Rust statements.
This type is available only if Syn is built with the "full"
feature.
Fields
brace_token: Brace
stmts: Vec<Stmt>
Statements in a block
Implementations
sourceimpl Block
impl Block
sourcepub fn parse_within(input: ParseStream<'_>) -> Result<Vec<Stmt>>
pub fn parse_within(input: ParseStream<'_>) -> Result<Vec<Stmt>>
Parse the body of a block as zero or more statements, possibly including one trailing expression.
This function is available only if Syn is built with the "parsing"
feature.
Example
use syn::{braced, token, Attribute, Block, Ident, Result, Stmt, Token};
use syn::parse::{Parse, ParseStream};
// Parse a function with no generics or parameter list.
//
// fn playground {
// let mut x = 1;
// x += 1;
// println!("{}", x);
// }
struct MiniFunction {
attrs: Vec<Attribute>,
fn_token: Token![fn],
name: Ident,
brace_token: token::Brace,
stmts: Vec<Stmt>,
}
impl Parse for MiniFunction {
fn parse(input: ParseStream) -> Result<Self> {
let outer_attrs = input.call(Attribute::parse_outer)?;
let fn_token: Token![fn] = input.parse()?;
let name: Ident = input.parse()?;
let content;
let brace_token = braced!(content in input);
let inner_attrs = content.call(Attribute::parse_inner)?;
let stmts = content.call(Block::parse_within)?;
Ok(MiniFunction {
attrs: {
let mut attrs = outer_attrs;
attrs.extend(inner_attrs);
attrs
},
fn_token,
name,
brace_token,
stmts,
})
}
}
Trait Implementations
sourceimpl ToTokens for Block
impl ToTokens for Block
sourcefn to_tokens(&self, tokens: &mut TokenStream)
fn to_tokens(&self, tokens: &mut TokenStream)
Write self
to the given TokenStream
. Read more
sourcefn to_token_stream(&self) -> TokenStream
fn to_token_stream(&self) -> TokenStream
Convert self
directly into a TokenStream
object. Read more
sourcefn into_token_stream(self) -> TokenStream
fn into_token_stream(self) -> TokenStream
Convert self
directly into a TokenStream
object. Read more
impl Eq for Block
Auto Trait Implementations
impl RefUnwindSafe for Block
impl !Send for Block
impl !Sync for Block
impl Unpin for Block
impl UnwindSafe for Block
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Spanned for T where
T: Spanned + ?Sized,
impl<T> Spanned for T where
T: Spanned + ?Sized,
sourcefn span(&self) -> Span
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. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more