Struct syn::token::Paren

pub struct Paren {
    pub span: Span,
}

(...)

Fields

span: Span

Implementations

impl Paren

pub fn surround<F>(&self, tokens: &mut TokenStream, f: F)where
    F: FnOnce(&mut TokenStream),

Examples found in repository

src/data.rs (lines 448-450)

        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.paren_token.surround(tokens, |tokens| {
                self.unnamed.to_tokens(tokens);
            });
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for Field {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            tokens.append_all(&self.attrs);
            self.vis.to_tokens(tokens);
            if let Some(ident) = &self.ident {
                ident.to_tokens(tokens);
                TokensOrDefault(&self.colon_token).to_tokens(tokens);
            }
            self.ty.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for VisPublic {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.pub_token.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for VisCrate {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.crate_token.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for VisRestricted {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.pub_token.to_tokens(tokens);
            self.paren_token.surround(tokens, |tokens| {
                // TODO: If we have a path which is not "self" or "super" or
                // "crate", automatically add the "in" token.
                self.in_token.to_tokens(tokens);
                self.path.to_tokens(tokens);
            });
        }

src/attr.rs (lines 648-650)

        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.path.to_tokens(tokens);
            self.paren_token.surround(tokens, |tokens| {
                self.nested.to_tokens(tokens);
            });
        }

src/path.rs (lines 814-816)

        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.paren_token.surround(tokens, |tokens| {
                self.inputs.to_tokens(tokens);
            });
            self.output.to_tokens(tokens);
        }

src/pat.rs (lines 838-840)

        fn to_tokens(&self, tokens: &mut TokenStream) {
            tokens.append_all(self.attrs.outer());
            self.paren_token.surround(tokens, |tokens| {
                self.elems.to_tokens(tokens);
            });
        }

src/expr.rs (lines 2966-2968)

    fn wrap_bare_struct(tokens: &mut TokenStream, e: &Expr) {
        if let Expr::Struct(_) = *e {
            token::Paren::default().surround(tokens, |tokens| {
                e.to_tokens(tokens);
            });
        } else {
            e.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    pub(crate) fn outer_attrs_to_tokens(attrs: &[Attribute], tokens: &mut TokenStream) {
        tokens.append_all(attrs.outer());
    }

    #[cfg(feature = "full")]
    fn inner_attrs_to_tokens(attrs: &[Attribute], tokens: &mut TokenStream) {
        tokens.append_all(attrs.inner());
    }

    #[cfg(not(feature = "full"))]
    pub(crate) fn outer_attrs_to_tokens(_attrs: &[Attribute], _tokens: &mut TokenStream) {}

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprBox {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.box_token.to_tokens(tokens);
            self.expr.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprArray {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.bracket_token.surround(tokens, |tokens| {
                self.elems.to_tokens(tokens);
            });
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprCall {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.func.to_tokens(tokens);
            self.paren_token.surround(tokens, |tokens| {
                self.args.to_tokens(tokens);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprMethodCall {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.receiver.to_tokens(tokens);
            self.dot_token.to_tokens(tokens);
            self.method.to_tokens(tokens);
            self.turbofish.to_tokens(tokens);
            self.paren_token.surround(tokens, |tokens| {
                self.args.to_tokens(tokens);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for MethodTurbofish {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.colon2_token.to_tokens(tokens);
            self.lt_token.to_tokens(tokens);
            self.args.to_tokens(tokens);
            self.gt_token.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for GenericMethodArgument {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            match self {
                GenericMethodArgument::Type(t) => t.to_tokens(tokens),
                GenericMethodArgument::Const(c) => c.to_tokens(tokens),
            }
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprTuple {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.paren_token.surround(tokens, |tokens| {
                self.elems.to_tokens(tokens);
                // If we only have one argument, we need a trailing comma to
                // distinguish ExprTuple from ExprParen.
                if self.elems.len() == 1 && !self.elems.trailing_punct() {
                    <Token![,]>::default().to_tokens(tokens);
                }
            });
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprBinary {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.left.to_tokens(tokens);
            self.op.to_tokens(tokens);
            self.right.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprUnary {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.op.to_tokens(tokens);
            self.expr.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprLit {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.lit.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprCast {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.expr.to_tokens(tokens);
            self.as_token.to_tokens(tokens);
            self.ty.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprType {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.expr.to_tokens(tokens);
            self.colon_token.to_tokens(tokens);
            self.ty.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    fn maybe_wrap_else(tokens: &mut TokenStream, else_: &Option<(Token![else], Box<Expr>)>) {
        if let Some((else_token, else_)) = else_ {
            else_token.to_tokens(tokens);

            // If we are not one of the valid expressions to exist in an else
            // clause, wrap ourselves in a block.
            match **else_ {
                Expr::If(_) | Expr::Block(_) => {
                    else_.to_tokens(tokens);
                }
                _ => {
                    token::Brace::default().surround(tokens, |tokens| {
                        else_.to_tokens(tokens);
                    });
                }
            }
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprLet {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.let_token.to_tokens(tokens);
            self.pat.to_tokens(tokens);
            self.eq_token.to_tokens(tokens);
            wrap_bare_struct(tokens, &self.expr);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprIf {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.if_token.to_tokens(tokens);
            wrap_bare_struct(tokens, &self.cond);
            self.then_branch.to_tokens(tokens);
            maybe_wrap_else(tokens, &self.else_branch);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprWhile {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.label.to_tokens(tokens);
            self.while_token.to_tokens(tokens);
            wrap_bare_struct(tokens, &self.cond);
            self.body.brace_token.surround(tokens, |tokens| {
                inner_attrs_to_tokens(&self.attrs, tokens);
                tokens.append_all(&self.body.stmts);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprForLoop {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.label.to_tokens(tokens);
            self.for_token.to_tokens(tokens);
            self.pat.to_tokens(tokens);
            self.in_token.to_tokens(tokens);
            wrap_bare_struct(tokens, &self.expr);
            self.body.brace_token.surround(tokens, |tokens| {
                inner_attrs_to_tokens(&self.attrs, tokens);
                tokens.append_all(&self.body.stmts);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprLoop {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.label.to_tokens(tokens);
            self.loop_token.to_tokens(tokens);
            self.body.brace_token.surround(tokens, |tokens| {
                inner_attrs_to_tokens(&self.attrs, tokens);
                tokens.append_all(&self.body.stmts);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprMatch {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.match_token.to_tokens(tokens);
            wrap_bare_struct(tokens, &self.expr);
            self.brace_token.surround(tokens, |tokens| {
                inner_attrs_to_tokens(&self.attrs, tokens);
                for (i, arm) in self.arms.iter().enumerate() {
                    arm.to_tokens(tokens);
                    // Ensure that we have a comma after a non-block arm, except
                    // for the last one.
                    let is_last = i == self.arms.len() - 1;
                    if !is_last && requires_terminator(&arm.body) && arm.comma.is_none() {
                        <Token![,]>::default().to_tokens(tokens);
                    }
                }
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprAsync {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.async_token.to_tokens(tokens);
            self.capture.to_tokens(tokens);
            self.block.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprAwait {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.base.to_tokens(tokens);
            self.dot_token.to_tokens(tokens);
            self.await_token.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprTryBlock {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.try_token.to_tokens(tokens);
            self.block.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprYield {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.yield_token.to_tokens(tokens);
            self.expr.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprClosure {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.movability.to_tokens(tokens);
            self.asyncness.to_tokens(tokens);
            self.capture.to_tokens(tokens);
            self.or1_token.to_tokens(tokens);
            self.inputs.to_tokens(tokens);
            self.or2_token.to_tokens(tokens);
            self.output.to_tokens(tokens);
            self.body.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprUnsafe {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.unsafe_token.to_tokens(tokens);
            self.block.brace_token.surround(tokens, |tokens| {
                inner_attrs_to_tokens(&self.attrs, tokens);
                tokens.append_all(&self.block.stmts);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprBlock {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.label.to_tokens(tokens);
            self.block.brace_token.surround(tokens, |tokens| {
                inner_attrs_to_tokens(&self.attrs, tokens);
                tokens.append_all(&self.block.stmts);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprAssign {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.left.to_tokens(tokens);
            self.eq_token.to_tokens(tokens);
            self.right.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprAssignOp {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.left.to_tokens(tokens);
            self.op.to_tokens(tokens);
            self.right.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprField {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.base.to_tokens(tokens);
            self.dot_token.to_tokens(tokens);
            self.member.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for Member {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            match self {
                Member::Named(ident) => ident.to_tokens(tokens),
                Member::Unnamed(index) => index.to_tokens(tokens),
            }
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for Index {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            let mut lit = Literal::i64_unsuffixed(i64::from(self.index));
            lit.set_span(self.span);
            tokens.append(lit);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprIndex {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.expr.to_tokens(tokens);
            self.bracket_token.surround(tokens, |tokens| {
                self.index.to_tokens(tokens);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for RangeLimits {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            match self {
                RangeLimits::HalfOpen(t) => t.to_tokens(tokens),
                RangeLimits::Closed(t) => t.to_tokens(tokens),
            }
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprRange {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.from.to_tokens(tokens);
            self.limits.to_tokens(tokens);
            self.to.to_tokens(tokens);
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprPath {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            path::printing::print_path(tokens, &self.qself, &self.path);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprReference {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.and_token.to_tokens(tokens);
            self.mutability.to_tokens(tokens);
            self.expr.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprBreak {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.break_token.to_tokens(tokens);
            self.label.to_tokens(tokens);
            self.expr.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprContinue {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.continue_token.to_tokens(tokens);
            self.label.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprReturn {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.return_token.to_tokens(tokens);
            self.expr.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprMacro {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.mac.to_tokens(tokens);
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprStruct {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.path.to_tokens(tokens);
            self.brace_token.surround(tokens, |tokens| {
                self.fields.to_tokens(tokens);
                if let Some(dot2_token) = &self.dot2_token {
                    dot2_token.to_tokens(tokens);
                } else if self.rest.is_some() {
                    Token![..](Span::call_site()).to_tokens(tokens);
                }
                self.rest.to_tokens(tokens);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprRepeat {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.bracket_token.surround(tokens, |tokens| {
                self.expr.to_tokens(tokens);
                self.semi_token.to_tokens(tokens);
                self.len.to_tokens(tokens);
            });
        }
    }

    #[cfg(feature = "full")]
    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprGroup {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.group_token.surround(tokens, |tokens| {
                self.expr.to_tokens(tokens);
            });
        }
    }

    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
    impl ToTokens for ExprParen {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            outer_attrs_to_tokens(&self.attrs, tokens);
            self.paren_token.surround(tokens, |tokens| {
                self.expr.to_tokens(tokens);
            });
        }

src/mac.rs (line 208)

        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.path.to_tokens(tokens);
            self.bang_token.to_tokens(tokens);
            match &self.delimiter {
                MacroDelimiter::Paren(paren) => {
                    paren.surround(tokens, |tokens| self.tokens.to_tokens(tokens));
                }
                MacroDelimiter::Brace(brace) => {
                    brace.surround(tokens, |tokens| self.tokens.to_tokens(tokens));
                }
                MacroDelimiter::Bracket(bracket) => {
                    bracket.surround(tokens, |tokens| self.tokens.to_tokens(tokens));
                }
            }
        }

Additional examples can be found in:

• src/ty.rs
• src/item.rs
• src/generics.rs

Trait Implementations

impl Clone for Paren

Available on crate feature clone-impls only.

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Paren

Available on crate feature extra-traits only.

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

Formats the value using the given formatter.

impl Default for Paren

fn default() -> Self

Returns the “default value” for a type.

impl Hash for Paren

Available on crate feature extra-traits only.

fn hash<H: Hasher>(&self, _state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq<Paren> for Paren

Available on crate feature extra-traits only.

fn eq(&self, _other: &Paren) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Paren

Available on crate feature clone-impls only.

impl Eq for Paren

Available on crate feature extra-traits only.

impl Token for Paren