Trait Token 

pub trait Token: Spanned + Sized {
    const SPELLING: &'static str;

    // Required methods
    fn matches_token_tree(token: &TokenTree) -> bool;
    fn from_token_tree(token: TokenTree) -> Option<Self>;
}

A generated closed token atom backed by one matching raw TokenTree.

Parsing validates the raw category and spelling, then retains the raw atom so emission preserves distinctions such as implicit whitespace versus the explicit SPACE spelling.

Required Associated Constants

const SPELLING: &'static str

Canonical spelling used in diagnostics and freshly constructed atoms.

Required Methods

fn matches_token_tree(token: &TokenTree) -> bool

Tests whether a raw atom belongs to this closed token type.

fn from_token_tree(token: TokenTree) -> Option<Self>

Validates and retains a raw atom as this typed token.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Token for _Add

const SPELLING: &'static str = "+"

impl Token for _AddAdd

const SPELLING: &'static str = "++"

impl Token for _AddAddEql

const SPELLING: &'static str = "++="

impl Token for _AddEql

const SPELLING: &'static str = "+="

impl Token for _Amp

const SPELLING: &'static str = "&"

impl Token for _AmpEql

const SPELLING: &'static str = "&="

impl Token for _And

const SPELLING: &'static str = "and"

impl Token for _Att

const SPELLING: &'static str = "@"

impl Token for _AttAtt

const SPELLING: &'static str = "@@"

impl Token for _AttAttEql

const SPELLING: &'static str = "@@="

impl Token for _AttAttQsm

const SPELLING: &'static str = "@@?"

impl Token for _AttAttQsmEql

const SPELLING: &'static str = "@@?="

impl Token for _AttEql

const SPELLING: &'static str = "@="

impl Token for _Bng

const SPELLING: &'static str = "!"

impl Token for _BngEql

const SPELLING: &'static str = "!="

impl Token for _Box

const SPELLING: &'static str = "⊠"

impl Token for _BoxEql

const SPELLING: &'static str = "⊠="

impl Token for _BreakKeyword

const SPELLING: &'static str = "break"

impl Token for _BreakpointKeyword

const SPELLING: &'static str = "breakpoint"

impl Token for _Bsl

const SPELLING: &'static str = "\\"

impl Token for _BslBsl

const SPELLING: &'static str = "\\\\"

impl Token for _BslBslEql

const SPELLING: &'static str = "\\\\="

impl Token for _BslEql

const SPELLING: &'static str = "\\="

impl Token for _CatchKeyword

const SPELLING: &'static str = "catch"

impl Token for _Cdt

const SPELLING: &'static str = "·"

impl Token for _CdtEql

const SPELLING: &'static str = "·="

impl Token for _Cma

const SPELLING: &'static str = ","

impl Token for _Col

const SPELLING: &'static str = ":"

impl Token for _ColEql

const SPELLING: &'static str = ":="

impl Token for _ContinueKeyword

const SPELLING: &'static str = "continue"

impl Token for _Crt

const SPELLING: &'static str = "^"

impl Token for _CrtBng

const SPELLING: &'static str = "^!"

impl Token for _CrtCrt

const SPELLING: &'static str = "^^"

impl Token for _CrtCrtEql

const SPELLING: &'static str = "^^="

impl Token for _CrtEql

const SPELLING: &'static str = "^="

impl Token for _CrtGst

const SPELLING: &'static str = "^>"

impl Token for _CrtGstEql

const SPELLING: &'static str = "^>="

impl Token for _CrtLst

const SPELLING: &'static str = "^<"

impl Token for _CrtLstEql

const SPELLING: &'static str = "^<="

impl Token for _CrtMul

const SPELLING: &'static str = "^*"

impl Token for _CrtMulMul

const SPELLING: &'static str = "^**"

impl Token for _CrtMulMulEql

const SPELLING: &'static str = "^**="

impl Token for _CrtTld

const SPELLING: &'static str = "^~"

impl Token for _DoKeyword

const SPELLING: &'static str = "do"

impl Token for _Dot

const SPELLING: &'static str = "."

impl Token for _DotDot

const SPELLING: &'static str = ".."

impl Token for _DotDotEql

const SPELLING: &'static str = "..="

impl Token for _DotDotLst

const SPELLING: &'static str = "..<"

impl Token for _DotDotLstEql

const SPELLING: &'static str = "..<="

impl Token for _DotQsm

const SPELLING: &'static str = ".?"

impl Token for _ElapsedTimeKeyword

const SPELLING: &'static str = "elapsedTime"

impl Token for _ElapsedTimingKeyword

const SPELLING: &'static str = "elapsedTiming"

impl Token for _ElseKeyword

const SPELLING: &'static str = "else"

impl Token for _Eql

const SPELLING: &'static str = "="

impl Token for _EqlBngEql

const SPELLING: &'static str = "=!="

impl Token for _EqlEql

const SPELLING: &'static str = "=="

impl Token for _EqlEqlEql

const SPELLING: &'static str = "==="

impl Token for _EqlEqlEqlGst

const SPELLING: &'static str = "===>"

impl Token for _EqlEqlEqlGstEql

const SPELLING: &'static str = "===>="

impl Token for _EqlEqlGst

const SPELLING: &'static str = "==>"

impl Token for _EqlEqlGstEql

const SPELLING: &'static str = "==>="

impl Token for _EqlGst

const SPELLING: &'static str = "=>"

impl Token for _ExceptKeyword

const SPELLING: &'static str = "except"

impl Token for _FinishKeyword

const SPELLING: &'static str = "finish"

impl Token for _ForKeyword

const SPELLING: &'static str = "for"

impl Token for _FromKeyword

const SPELLING: &'static str = "from"

impl Token for _GlobalKeyword

const SPELLING: &'static str = "global"

impl Token for _Graded

const SPELLING: &'static str = "(*)"

impl Token for _Gst

const SPELLING: &'static str = ">"

impl Token for _GstEql

const SPELLING: &'static str = ">="

impl Token for _GstGst

const SPELLING: &'static str = ">>"

impl Token for _GstGstEql

const SPELLING: &'static str = ">>="

impl Token for _Hsh

const SPELLING: &'static str = "#"

impl Token for _HshQsm

const SPELLING: &'static str = "#?"

impl Token for _IfKeyword

const SPELLING: &'static str = "if"

impl Token for _InKeyword

const SPELLING: &'static str = "in"

impl Token for _ListKeyword

const SPELLING: &'static str = "list"

impl Token for _LocalKeyword

const SPELLING: &'static str = "local"

impl Token for _Lst

const SPELLING: &'static str = "<"

impl Token for _LstEql

const SPELLING: &'static str = "<="

impl Token for _LstEqlEql

const SPELLING: &'static str = "<=="

impl Token for _LstEqlEqlEql

const SPELLING: &'static str = "<==="

impl Token for _LstEqlEqlGst

const SPELLING: &'static str = "<==>"

impl Token for _LstEqlEqlGstEql

const SPELLING: &'static str = "<==>="

impl Token for _LstLst

const SPELLING: &'static str = "<<"

impl Token for _LstLstEql

const SPELLING: &'static str = "<<="

impl Token for _LstSub

const SPELLING: &'static str = "<-"

impl Token for _Mod

const SPELLING: &'static str = "%"

impl Token for _ModEql

const SPELLING: &'static str = "%="

impl Token for _Mul

const SPELLING: &'static str = "*"

impl Token for _MulEql

const SPELLING: &'static str = "*="

impl Token for _MulMul

const SPELLING: &'static str = "**"

impl Token for _MulMulEql

const SPELLING: &'static str = "**="

impl Token for _NewKeyword

const SPELLING: &'static str = "new"

impl Token for _Not

const SPELLING: &'static str = "not"

impl Token for _OfKeyword

const SPELLING: &'static str = "of"

impl Token for _Or

const SPELLING: &'static str = "or"

impl Token for _Pip

const SPELLING: &'static str = "|"

impl Token for _PipEql

const SPELLING: &'static str = "|="

impl Token for _PipPip

const SPELLING: &'static str = "||"

impl Token for _PipPipEql

const SPELLING: &'static str = "||="

impl Token for _PipSub

const SPELLING: &'static str = "|-"

impl Token for _PipSubEql

const SPELLING: &'static str = "|-="

impl Token for _PipUbs

const SPELLING: &'static str = "|_"

impl Token for _PipUbsEql

const SPELLING: &'static str = "|_="

impl Token for _ProfileKeyword

const SPELLING: &'static str = "profile"

impl Token for _Qsm

const SPELLING: &'static str = "?"

impl Token for _QsmQsm

const SPELLING: &'static str = "??"

impl Token for _QsmQsmEql

const SPELLING: &'static str = "??="

impl Token for _ReturnKeyword

const SPELLING: &'static str = "return"

impl Token for _Scl

const SPELLING: &'static str = ";"

impl Token for _Sfp

const SPELLING: &'static str = "⧢"

impl Token for _SfpEql

const SPELLING: &'static str = "⧢="

impl Token for _ShieldKeyword

const SPELLING: &'static str = "shield"

impl Token for _Slh

const SPELLING: &'static str = "/"

impl Token for _SlhEql

const SPELLING: &'static str = "/="

impl Token for _SlhSlh

const SPELLING: &'static str = "//"

impl Token for _SlhSlhEql

const SPELLING: &'static str = "//="

impl Token for _Space

const SPELLING: &'static str = "SPACE"

impl Token for _StepKeyword

const SPELLING: &'static str = "step"

impl Token for _Sub

const SPELLING: &'static str = "-"

impl Token for _SubEql

const SPELLING: &'static str = "-="

impl Token for _SubGst

const SPELLING: &'static str = "->"

impl Token for _SymbolKeyword

const SPELLING: &'static str = "symbol"

impl Token for _TestKeyword

const SPELLING: &'static str = "TEST"

impl Token for _ThenKeyword

const SPELLING: &'static str = "then"

impl Token for _ThreadLocalKeyword

const SPELLING: &'static str = "threadLocal"

impl Token for _ThreadVariableKeyword

const SPELLING: &'static str = "threadVariable"

impl Token for _ThrowKeyword

const SPELLING: &'static str = "throw"

impl Token for _TimeKeyword

const SPELLING: &'static str = "time"

impl Token for _TimingKeyword

const SPELLING: &'static str = "timing"

impl Token for _Tld

const SPELLING: &'static str = "~"

impl Token for _TldEql

const SPELLING: &'static str = "~="

impl Token for _ToKeyword

const SPELLING: &'static str = "to"

impl Token for _TrapKeyword

const SPELLING: &'static str = "trap"

impl Token for _TryKeyword

const SPELLING: &'static str = "try"

impl Token for _Ubs

const SPELLING: &'static str = "_"

impl Token for _UbsBng

const SPELLING: &'static str = "_!"

impl Token for _UbsEql

const SPELLING: &'static str = "_="

impl Token for _UbsGst

const SPELLING: &'static str = "_>"

impl Token for _UbsGstEql

const SPELLING: &'static str = "_>="

impl Token for _UbsLst

const SPELLING: &'static str = "_<"

impl Token for _UbsLstEql

const SPELLING: &'static str = "_<="

impl Token for _UbsMul

const SPELLING: &'static str = "_*"

impl Token for _UbsTld

const SPELLING: &'static str = "_~"

impl Token for _WhenKeyword

const SPELLING: &'static str = "when"

impl Token for _WhileKeyword

const SPELLING: &'static str = "while"

impl Token for _Xor

const SPELLING: &'static str = "xor"