Enum syn::Pat

source · [−]

pub enum Pat {
Show 16 variants
    Box(PatBox),
    Ident(PatIdent),
    Lit(PatLit),
    Macro(PatMacro),
    Or(PatOr),
    Path(PatPath),
    Range(PatRange),
    Reference(PatReference),
    Rest(PatRest),
    Slice(PatSlice),
    Struct(PatStruct),
    Tuple(PatTuple),
    TupleStruct(PatTupleStruct),
    Type(PatType),
    Verbatim(TokenStream),
    Wild(PatWild),
    // some variants omitted
}

Expand description

A pattern in a local binding, function signature, match expression, or various other places.

This type is available only if Syn is built with the "full" feature.

Syntax tree enum

This type is a syntax tree enum.

Variants

`Box(PatBox)`

A box pattern: box v.

`Ident(PatIdent)`

A pattern that binds a new variable: ref mut binding @ SUBPATTERN.

`Lit(PatLit)`

A literal pattern: 0.

This holds an Expr rather than a Lit because negative numbers are represented as an Expr::Unary.

`Macro(PatMacro)`

A macro in pattern position.

`Or(PatOr)`

A pattern that matches any one of a set of cases.

`Path(PatPath)`

A path pattern like Color::Red, optionally qualified with a self-type.

Unqualified path patterns can legally refer to variants, structs, constants or associated constants. Qualified path patterns like <A>::B::C and <A as Trait>::B::C can only legally refer to associated constants.

`Range(PatRange)`

A range pattern: 1..=2.

`Reference(PatReference)`

A reference pattern: &mut var.

`Rest(PatRest)`

The dots in a tuple or slice pattern: [0, 1, ..]

`Slice(PatSlice)`

A dynamically sized slice pattern: [a, b, ref i @ .., y, z].

`Struct(PatStruct)`

A struct or struct variant pattern: Variant { x, y, .. }.

`Tuple(PatTuple)`

A tuple pattern: (a, b).

`TupleStruct(PatTupleStruct)`

A tuple struct or tuple variant pattern: Variant(x, y, .., z).

`Type(PatType)`

A type ascription pattern: foo: f64.

`Verbatim(TokenStream)`

Tokens in pattern position not interpreted by Syn.

`Wild(PatWild)`

A pattern that matches any value: _.

Trait Implementations

impl Clone for Pat

fn clone(&self) -> Self

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from source. Read more

impl Debug for Pat

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

Formats the value using the given formatter. Read more

impl From<PatBox> for Pat

fn from(e: PatBox) -> Pat

Performs the conversion.

impl From<PatIdent> for Pat

fn from(e: PatIdent) -> Pat

Performs the conversion.

impl From<PatLit> for Pat

fn from(e: PatLit) -> Pat

Performs the conversion.

impl From<PatMacro> for Pat

fn from(e: PatMacro) -> Pat

Performs the conversion.

impl From<PatOr> for Pat

fn from(e: PatOr) -> Pat

Performs the conversion.

impl From<PatPath> for Pat

fn from(e: PatPath) -> Pat

Performs the conversion.

impl From<PatRange> for Pat

fn from(e: PatRange) -> Pat

Performs the conversion.

impl From<PatReference> for Pat

fn from(e: PatReference) -> Pat

Performs the conversion.

impl From<PatRest> for Pat

fn from(e: PatRest) -> Pat

Performs the conversion.

impl From<PatSlice> for Pat

fn from(e: PatSlice) -> Pat

Performs the conversion.

impl From<PatStruct> for Pat

fn from(e: PatStruct) -> Pat

Performs the conversion.

impl From<PatTuple> for Pat

fn from(e: PatTuple) -> Pat

Performs the conversion.

impl From<PatTupleStruct> for Pat

fn from(e: PatTupleStruct) -> Pat

Performs the conversion.

impl From<PatType> for Pat

fn from(e: PatType) -> Pat

Performs the conversion.

impl From<PatWild> for Pat

fn from(e: PatWild) -> Pat

Performs the conversion.

impl Hash for Pat

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

Feeds this value into the given Hasher. Read more

1.3.0 · source

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

Feeds a slice of this type into the given Hasher. Read more

impl Parse for Pat

fn parse(input: ParseStream<'_>) -> Result<Self>

impl PartialEq<Pat> for Pat

fn eq(&self, other: &Self) -> bool

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

1.0.0 · source

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

This method tests for !=.

impl ToTokens for Pat

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

Write self to the given TokenStream. Read more

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object. Read more

fn into_token_stream(self) -> TokenStream

Convert self directly into a TokenStream object. Read more

impl Eq for Pat

Auto Trait Implementations

impl RefUnwindSafe for Pat

impl !Send for Pat

impl !Sync for Pat

impl Unpin for Pat

impl UnwindSafe for Pat

Blanket Implementations

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

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

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

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

fn into(self) -> U

Calls U::from(self).

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

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

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

impl<T> ToOwned for T where
T: Clone,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

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

fn clone_into(&self, target: &mut T)

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

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

impl<T, U> TryFrom<U> for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

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

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.