vendor/syn/tests/common/eq.rs

   1 extern crate rustc_ast;
   2 extern crate rustc_data_structures;
   3 extern crate rustc_span;
   4
   5 use rustc_ast::ast::{
   6     AngleBracketedArg, AngleBracketedArgs, AnonConst, Arm, AssocItemKind, AssocTyConstraint,
   7     AssocTyConstraintKind, Async, AttrId, AttrItem, AttrKind, AttrStyle, Attribute, BareFnTy,
   8     BinOpKind, BindingMode, Block, BlockCheckMode, BorrowKind, CaptureBy, Const, Crate, CrateSugar,
   9     Defaultness, EnumDef, Expr, ExprField, ExprKind, Extern, FieldDef, FloatTy, FnDecl, FnHeader,
  10     FnKind, FnRetTy, FnSig, ForeignItemKind, ForeignMod, GenericArg, GenericArgs, GenericBound,
  11     GenericParam, GenericParamKind, Generics, ImplKind, ImplPolarity, Inline, InlineAsm,
  12     InlineAsmOperand, InlineAsmOptions, InlineAsmRegOrRegClass, InlineAsmTemplatePiece, IntTy,
  13     IsAuto, Item, ItemKind, Label, Lifetime, Lit, LitFloatType, LitIntType, LitKind,
  14     LlvmAsmDialect, LlvmInlineAsm, LlvmInlineAsmOutput, Local, MacArgs, MacCall, MacCallStmt,
  15     MacDelimiter, MacStmtStyle, MacroDef, ModKind, Movability, MutTy, Mutability, NodeId, Param,
  16     ParenthesizedArgs, Pat, PatField, PatKind, Path, PathSegment, PolyTraitRef, QSelf, RangeEnd,
  17     RangeLimits, RangeSyntax, Stmt, StmtKind, StrLit, StrStyle, StructExpr, StructRest,
  18     TraitBoundModifier, TraitKind, TraitObjectSyntax, TraitRef, Ty, TyAliasKind, TyKind, UintTy,
  19     UnOp, Unsafe, UnsafeSource, UseTree, UseTreeKind, Variant, VariantData, Visibility,
  20     VisibilityKind, WhereBoundPredicate, WhereClause, WhereEqPredicate, WherePredicate,
  21     WhereRegionPredicate,
  22 };
  23 use rustc_ast::ptr::P;
  24 use rustc_ast::token::{self, CommentKind, DelimToken, Nonterminal, Token, TokenKind};
  25 use rustc_ast::tokenstream::{
  26     AttrAnnotatedTokenStream, AttrAnnotatedTokenTree, AttributesData, DelimSpan, LazyTokenStream,
  27     Spacing, TokenStream, TokenTree,
  28 };
  29 use rustc_data_structures::sync::Lrc;
  30 use rustc_data_structures::thin_vec::ThinVec;
  31 use rustc_span::source_map::Spanned;
  32 use rustc_span::symbol::{sym, Ident};
  33 use rustc_span::{Span, Symbol, SyntaxContext, DUMMY_SP};
  34
  35 pub trait SpanlessEq {
  36     fn eq(&self, other: &Self) -> bool;
  37 }
  38
  39 impl<T: SpanlessEq> SpanlessEq for Box<T> {
  40     fn eq(&self, other: &Self) -> bool {
  41         SpanlessEq::eq(&**self, &**other)
  42     }
  43 }
  44
  45 impl<T: SpanlessEq> SpanlessEq for P<T> {
  46     fn eq(&self, other: &Self) -> bool {
  47         SpanlessEq::eq(&**self, &**other)
  48     }
  49 }
  50
  51 impl<T: ?Sized + SpanlessEq> SpanlessEq for Lrc<T> {
  52     fn eq(&self, other: &Self) -> bool {
  53         SpanlessEq::eq(&**self, &**other)
  54     }
  55 }
  56
  57 impl<T: SpanlessEq> SpanlessEq for Option<T> {
  58     fn eq(&self, other: &Self) -> bool {
  59         match (self, other) {
  60             (None, None) => true,
  61             (Some(this), Some(other)) => SpanlessEq::eq(this, other),
  62             _ => false,
  63         }
  64     }
  65 }
  66
  67 impl<T: SpanlessEq> SpanlessEq for [T] {
  68     fn eq(&self, other: &Self) -> bool {
  69         self.len() == other.len() && self.iter().zip(other).all(|(a, b)| SpanlessEq::eq(a, b))
  70     }
  71 }
  72
  73 impl<T: SpanlessEq> SpanlessEq for Vec<T> {
  74     fn eq(&self, other: &Self) -> bool {
  75         <[T] as SpanlessEq>::eq(self, other)
  76     }
  77 }
  78
  79 impl<T: SpanlessEq> SpanlessEq for ThinVec<T> {
  80     fn eq(&self, other: &Self) -> bool {
  81         self.len() == other.len()
  82             && self
  83                 .iter()
  84                 .zip(other.iter())
  85                 .all(|(a, b)| SpanlessEq::eq(a, b))
  86     }
  87 }
  88
  89 impl<T: SpanlessEq> SpanlessEq for Spanned<T> {
  90     fn eq(&self, other: &Self) -> bool {
  91         SpanlessEq::eq(&self.node, &other.node)
  92     }
  93 }
  94
  95 impl<A: SpanlessEq, B: SpanlessEq> SpanlessEq for (A, B) {
  96     fn eq(&self, other: &Self) -> bool {
  97         SpanlessEq::eq(&self.0, &other.0) && SpanlessEq::eq(&self.1, &other.1)
  98     }
  99 }
 100
 101 macro_rules! spanless_eq_true {
 102     ($name:ty) => {
 103         impl SpanlessEq for $name {
 104             fn eq(&self, _other: &Self) -> bool {
 105                 true
 106             }
 107         }
 108     };
 109 }
 110
 111 spanless_eq_true!(Span);
 112 spanless_eq_true!(DelimSpan);
 113 spanless_eq_true!(AttrId);
 114 spanless_eq_true!(NodeId);
 115 spanless_eq_true!(SyntaxContext);
 116 spanless_eq_true!(Spacing);
 117
 118 macro_rules! spanless_eq_partial_eq {
 119     ($name:ty) => {
 120         impl SpanlessEq for $name {
 121             fn eq(&self, other: &Self) -> bool {
 122                 PartialEq::eq(self, other)
 123             }
 124         }
 125     };
 126 }
 127
 128 spanless_eq_partial_eq!(bool);
 129 spanless_eq_partial_eq!(u8);
 130 spanless_eq_partial_eq!(u16);
 131 spanless_eq_partial_eq!(u128);
 132 spanless_eq_partial_eq!(usize);
 133 spanless_eq_partial_eq!(char);
 134 spanless_eq_partial_eq!(String);
 135 spanless_eq_partial_eq!(Symbol);
 136 spanless_eq_partial_eq!(CommentKind);
 137 spanless_eq_partial_eq!(DelimToken);
 138 spanless_eq_partial_eq!(InlineAsmOptions);
 139 spanless_eq_partial_eq!(token::LitKind);
 140
 141 macro_rules! spanless_eq_struct {
 142     {
 143         $($name:ident)::+ $(<$param:ident>)?
 144         $([$field:tt $this:ident $other:ident])*
 145         $(![$ignore:tt])*;
 146     } => {
 147         impl $(<$param: SpanlessEq>)* SpanlessEq for $($name)::+ $(<$param>)* {
 148             fn eq(&self, other: &Self) -> bool {
 149                 let $($name)::+ { $($field: $this,)* $($ignore: _,)* } = self;
 150                 let $($name)::+ { $($field: $other,)* $($ignore: _,)* } = other;
 151                 true $(&& SpanlessEq::eq($this, $other))*
 152             }
 153         }
 154     };
 155
 156     {
 157         $($name:ident)::+ $(<$param:ident>)?
 158         $([$field:tt $this:ident $other:ident])*
 159         $(![$ignore:tt])*;
 160         !$next:tt
 161         $($rest:tt)*
 162     } => {
 163         spanless_eq_struct! {
 164             $($name)::+ $(<$param>)*
 165             $([$field $this $other])*
 166             $(![$ignore])*
 167             ![$next];
 168             $($rest)*
 169         }
 170     };
 171
 172     {
 173         $($name:ident)::+ $(<$param:ident>)?
 174         $([$field:tt $this:ident $other:ident])*
 175         $(![$ignore:tt])*;
 176         $next:tt
 177         $($rest:tt)*
 178     } => {
 179         spanless_eq_struct! {
 180             $($name)::+ $(<$param>)*
 181             $([$field $this $other])*
 182             [$next this other]
 183             $(![$ignore])*;
 184             $($rest)*
 185         }
 186     };
 187 }
 188
 189 macro_rules! spanless_eq_enum {
 190     {
 191         $($name:ident)::+;
 192         $([$($variant:ident)::+; $([$field:tt $this:ident $other:ident])* $(![$ignore:tt])*])*
 193     } => {
 194         impl SpanlessEq for $($name)::+ {
 195             fn eq(&self, other: &Self) -> bool {
 196                 match self {
 197                     $(
 198                         $($variant)::+ { .. } => {}
 199                     )*
 200                 }
 201                 #[allow(unreachable_patterns)]
 202                 match (self, other) {
 203                     $(
 204                         (
 205                             $($variant)::+ { $($field: $this,)* $($ignore: _,)* },
 206                             $($variant)::+ { $($field: $other,)* $($ignore: _,)* },
 207                         ) => {
 208                             true $(&& SpanlessEq::eq($this, $other))*
 209                         }
 210                     )*
 211                     _ => false,
 212                 }
 213             }
 214         }
 215     };
 216
 217     {
 218         $($name:ident)::+;
 219         $([$($variant:ident)::+; $($fields:tt)*])*
 220         $next:ident [$([$($named:tt)*])* $(![$ignore:tt])*] (!$i:tt $($field:tt)*)
 221         $($rest:tt)*
 222     } => {
 223         spanless_eq_enum! {
 224             $($name)::+;
 225             $([$($variant)::+; $($fields)*])*
 226             $next [$([$($named)*])* $(![$ignore])* ![$i]] ($($field)*)
 227             $($rest)*
 228         }
 229     };
 230
 231     {
 232         $($name:ident)::+;
 233         $([$($variant:ident)::+; $($fields:tt)*])*
 234         $next:ident [$([$($named:tt)*])* $(![$ignore:tt])*] ($i:tt $($field:tt)*)
 235         $($rest:tt)*
 236     } => {
 237         spanless_eq_enum! {
 238             $($name)::+;
 239             $([$($variant)::+; $($fields)*])*
 240             $next [$([$($named)*])* [$i this other] $(![$ignore])*] ($($field)*)
 241             $($rest)*
 242         }
 243     };
 244
 245     {
 246         $($name:ident)::+;
 247         $([$($variant:ident)::+; $($fields:tt)*])*
 248         $next:ident [$($named:tt)*] ()
 249         $($rest:tt)*
 250     } => {
 251         spanless_eq_enum! {
 252             $($name)::+;
 253             $([$($variant)::+; $($fields)*])*
 254             [$($name)::+::$next; $($named)*]
 255             $($rest)*
 256         }
 257     };
 258
 259     {
 260         $($name:ident)::+;
 261         $([$($variant:ident)::+; $($fields:tt)*])*
 262         $next:ident ($($field:tt)*)
 263         $($rest:tt)*
 264     } => {
 265         spanless_eq_enum! {
 266             $($name)::+;
 267             $([$($variant)::+; $($fields)*])*
 268             $next [] ($($field)*)
 269             $($rest)*
 270         }
 271     };
 272
 273     {
 274         $($name:ident)::+;
 275         $([$($variant:ident)::+; $($fields:tt)*])*
 276         $next:ident
 277         $($rest:tt)*
 278     } => {
 279         spanless_eq_enum! {
 280             $($name)::+;
 281             $([$($variant)::+; $($fields)*])*
 282             [$($name)::+::$next;]
 283             $($rest)*
 284         }
 285     };
 286 }
 287
 288 spanless_eq_struct!(AngleBracketedArgs; span args);
 289 spanless_eq_struct!(AnonConst; id value);
 290 spanless_eq_struct!(Arm; attrs pat guard body span id is_placeholder);
 291 spanless_eq_struct!(AssocTyConstraint; id ident gen_args kind span);
 292 spanless_eq_struct!(AttrAnnotatedTokenStream; 0);
 293 spanless_eq_struct!(AttrItem; path args tokens);
 294 spanless_eq_struct!(Attribute; kind id style span);
 295 spanless_eq_struct!(AttributesData; attrs tokens);
 296 spanless_eq_struct!(BareFnTy; unsafety ext generic_params decl);
 297 spanless_eq_struct!(Block; stmts id rules span tokens);
 298 spanless_eq_struct!(Crate; attrs items span proc_macros);
 299 spanless_eq_struct!(EnumDef; variants);
 300 spanless_eq_struct!(Expr; id kind span attrs !tokens);
 301 spanless_eq_struct!(ExprField; attrs id span ident expr is_shorthand is_placeholder);
 302 spanless_eq_struct!(FieldDef; attrs id span vis ident ty is_placeholder);
 303 spanless_eq_struct!(FnDecl; inputs output);
 304 spanless_eq_struct!(FnHeader; constness asyncness unsafety ext);
 305 spanless_eq_struct!(FnKind; 0 1 2 3);
 306 spanless_eq_struct!(FnSig; header decl span);
 307 spanless_eq_struct!(ForeignMod; unsafety abi items);
 308 spanless_eq_struct!(GenericParam; id ident attrs bounds is_placeholder kind);
 309 spanless_eq_struct!(Generics; params where_clause span);
 310 spanless_eq_struct!(ImplKind; unsafety polarity defaultness constness generics of_trait self_ty items);
 311 spanless_eq_struct!(InlineAsm; template operands options line_spans);
 312 spanless_eq_struct!(Item<K>; attrs id span vis ident kind !tokens);
 313 spanless_eq_struct!(Label; ident);
 314 spanless_eq_struct!(Lifetime; id ident);
 315 spanless_eq_struct!(Lit; token kind span);
 316 spanless_eq_struct!(LlvmInlineAsm; asm asm_str_style outputs inputs clobbers volatile alignstack dialect);
 317 spanless_eq_struct!(LlvmInlineAsmOutput; constraint expr is_rw is_indirect);
 318 spanless_eq_struct!(Local; pat ty init id span attrs !tokens);
 319 spanless_eq_struct!(MacCall; path args prior_type_ascription);
 320 spanless_eq_struct!(MacCallStmt; mac style attrs tokens);
 321 spanless_eq_struct!(MacroDef; body macro_rules);
 322 spanless_eq_struct!(MutTy; ty mutbl);
 323 spanless_eq_struct!(ParenthesizedArgs; span inputs inputs_span output);
 324 spanless_eq_struct!(Pat; id kind span tokens);
 325 spanless_eq_struct!(PatField; ident pat is_shorthand attrs id span is_placeholder);
 326 spanless_eq_struct!(Path; span segments tokens);
 327 spanless_eq_struct!(PathSegment; ident id args);
 328 spanless_eq_struct!(PolyTraitRef; bound_generic_params trait_ref span);
 329 spanless_eq_struct!(QSelf; ty path_span position);
 330 spanless_eq_struct!(Stmt; id kind span);
 331 spanless_eq_struct!(StrLit; style symbol suffix span symbol_unescaped);
 332 spanless_eq_struct!(StructExpr; qself path fields rest);
 333 spanless_eq_struct!(Token; kind span);
 334 spanless_eq_struct!(TraitKind; 0 1 2 3 4);
 335 spanless_eq_struct!(TraitRef; path ref_id);
 336 spanless_eq_struct!(Ty; id kind span tokens);
 337 spanless_eq_struct!(TyAliasKind; 0 1 2 3);
 338 spanless_eq_struct!(UseTree; prefix kind span);
 339 spanless_eq_struct!(Variant; attrs id span !vis ident data disr_expr is_placeholder);
 340 spanless_eq_struct!(Visibility; kind span tokens);
 341 spanless_eq_struct!(WhereBoundPredicate; span bound_generic_params bounded_ty bounds);
 342 spanless_eq_struct!(WhereClause; has_where_token predicates span);
 343 spanless_eq_struct!(WhereEqPredicate; id span lhs_ty rhs_ty);
 344 spanless_eq_struct!(WhereRegionPredicate; span lifetime bounds);
 345 spanless_eq_struct!(token::Lit; kind symbol suffix);
 346 spanless_eq_enum!(AngleBracketedArg; Arg(0) Constraint(0));
 347 spanless_eq_enum!(AssocItemKind; Const(0 1 2) Fn(0) TyAlias(0) MacCall(0));
 348 spanless_eq_enum!(AssocTyConstraintKind; Equality(ty) Bound(bounds));
 349 spanless_eq_enum!(Async; Yes(span closure_id return_impl_trait_id) No);
 350 spanless_eq_enum!(AttrAnnotatedTokenTree; Token(0) Delimited(0 1 2) Attributes(0));
 351 spanless_eq_enum!(AttrStyle; Outer Inner);
 352 spanless_eq_enum!(BinOpKind; Add Sub Mul Div Rem And Or BitXor BitAnd BitOr Shl Shr Eq Lt Le Ne Ge Gt);
 353 spanless_eq_enum!(BindingMode; ByRef(0) ByValue(0));
 354 spanless_eq_enum!(BlockCheckMode; Default Unsafe(0));
 355 spanless_eq_enum!(BorrowKind; Ref Raw);
 356 spanless_eq_enum!(CaptureBy; Value Ref);
 357 spanless_eq_enum!(Const; Yes(0) No);
 358 spanless_eq_enum!(CrateSugar; PubCrate JustCrate);
 359 spanless_eq_enum!(Defaultness; Default(0) Final);
 360 spanless_eq_enum!(Extern; None Implicit Explicit(0));
 361 spanless_eq_enum!(FloatTy; F32 F64);
 362 spanless_eq_enum!(FnRetTy; Default(0) Ty(0));
 363 spanless_eq_enum!(ForeignItemKind; Static(0 1 2) Fn(0) TyAlias(0) MacCall(0));
 364 spanless_eq_enum!(GenericArg; Lifetime(0) Type(0) Const(0));
 365 spanless_eq_enum!(GenericArgs; AngleBracketed(0) Parenthesized(0));
 366 spanless_eq_enum!(GenericBound; Trait(0 1) Outlives(0));
 367 spanless_eq_enum!(GenericParamKind; Lifetime Type(default) Const(ty kw_span default));
 368 spanless_eq_enum!(ImplPolarity; Positive Negative(0));
 369 spanless_eq_enum!(Inline; Yes No);
 370 spanless_eq_enum!(InlineAsmRegOrRegClass; Reg(0) RegClass(0));
 371 spanless_eq_enum!(InlineAsmTemplatePiece; String(0) Placeholder(operand_idx modifier span));
 372 spanless_eq_enum!(IntTy; Isize I8 I16 I32 I64 I128);
 373 spanless_eq_enum!(IsAuto; Yes No);
 374 spanless_eq_enum!(LitFloatType; Suffixed(0) Unsuffixed);
 375 spanless_eq_enum!(LitIntType; Signed(0) Unsigned(0) Unsuffixed);
 376 spanless_eq_enum!(LlvmAsmDialect; Att Intel);
 377 spanless_eq_enum!(MacArgs; Empty Delimited(0 1 2) Eq(0 1));
 378 spanless_eq_enum!(MacDelimiter; Parenthesis Bracket Brace);
 379 spanless_eq_enum!(MacStmtStyle; Semicolon Braces NoBraces);
 380 spanless_eq_enum!(ModKind; Loaded(0 1 2) Unloaded);
 381 spanless_eq_enum!(Movability; Static Movable);
 382 spanless_eq_enum!(Mutability; Mut Not);
 383 spanless_eq_enum!(RangeEnd; Included(0) Excluded);
 384 spanless_eq_enum!(RangeLimits; HalfOpen Closed);
 385 spanless_eq_enum!(StmtKind; Local(0) Item(0) Expr(0) Semi(0) Empty MacCall(0));
 386 spanless_eq_enum!(StrStyle; Cooked Raw(0));
 387 spanless_eq_enum!(StructRest; Base(0) Rest(0) None);
 388 spanless_eq_enum!(TokenTree; Token(0) Delimited(0 1 2));
 389 spanless_eq_enum!(TraitBoundModifier; None Maybe MaybeConst MaybeConstMaybe);
 390 spanless_eq_enum!(TraitObjectSyntax; Dyn None);
 391 spanless_eq_enum!(UintTy; Usize U8 U16 U32 U64 U128);
 392 spanless_eq_enum!(UnOp; Deref Not Neg);
 393 spanless_eq_enum!(Unsafe; Yes(0) No);
 394 spanless_eq_enum!(UnsafeSource; CompilerGenerated UserProvided);
 395 spanless_eq_enum!(UseTreeKind; Simple(0 1 2) Nested(0) Glob);
 396 spanless_eq_enum!(VariantData; Struct(0 1) Tuple(0 1) Unit(0));
 397 spanless_eq_enum!(VisibilityKind; Public Crate(0) Restricted(path id) Inherited);
 398 spanless_eq_enum!(WherePredicate; BoundPredicate(0) RegionPredicate(0) EqPredicate(0));
 399 spanless_eq_enum!(ExprKind; Box(0) Array(0) ConstBlock(0) Call(0 1)
 400     MethodCall(0 1 2) Tup(0) Binary(0 1 2) Unary(0 1) Lit(0) Cast(0 1) Type(0 1)
 401     Let(0 1) If(0 1 2) While(0 1 2) ForLoop(0 1 2 3) Loop(0 1) Match(0 1)
 402     Closure(0 1 2 3 4 5) Block(0 1) Async(0 1 2) Await(0) TryBlock(0)
 403     Assign(0 1 2) AssignOp(0 1 2) Field(0 1) Index(0 1) Underscore Range(0 1 2)
 404     Path(0 1) AddrOf(0 1 2) Break(0 1) Continue(0) Ret(0) InlineAsm(0)
 405     LlvmInlineAsm(0) MacCall(0) Struct(0) Repeat(0 1) Paren(0) Try(0) Yield(0)
 406     Err);
 407 spanless_eq_enum!(InlineAsmOperand; In(reg expr) Out(reg late expr)
 408     InOut(reg late expr) SplitInOut(reg late in_expr out_expr) Const(anon_const)
 409     Sym(expr));
 410 spanless_eq_enum!(ItemKind; ExternCrate(0) Use(0) Static(0 1 2) Const(0 1 2)
 411     Fn(0) Mod(0 1) ForeignMod(0) GlobalAsm(0) TyAlias(0) Enum(0 1) Struct(0 1)
 412     Union(0 1) Trait(0) TraitAlias(0 1) Impl(0) MacCall(0) MacroDef(0));
 413 spanless_eq_enum!(LitKind; Str(0 1) ByteStr(0) Byte(0) Char(0) Int(0 1)
 414     Float(0 1) Bool(0) Err(0));
 415 spanless_eq_enum!(PatKind; Wild Ident(0 1 2) Struct(0 1 2 3) TupleStruct(0 1 2)
 416     Or(0) Path(0 1) Tuple(0) Box(0) Ref(0 1) Lit(0) Range(0 1 2) Slice(0) Rest
 417     Paren(0) MacCall(0));
 418 spanless_eq_enum!(TyKind; Slice(0) Array(0 1) Ptr(0) Rptr(0 1) BareFn(0) Never
 419     Tup(0) AnonymousStruct(0 1) AnonymousUnion(0 1) Path(0 1) TraitObject(0 1)
 420     ImplTrait(0 1) Paren(0) Typeof(0) Infer ImplicitSelf MacCall(0) Err
 421     CVarArgs);
 422
 423 impl SpanlessEq for Ident {
 424     fn eq(&self, other: &Self) -> bool {
 425         self.as_str() == other.as_str()
 426     }
 427 }
 428
 429 impl SpanlessEq for RangeSyntax {
 430     fn eq(&self, _other: &Self) -> bool {
 431         match self {
 432             RangeSyntax::DotDotDot | RangeSyntax::DotDotEq => true,
 433         }
 434     }
 435 }
 436
 437 impl SpanlessEq for Param {
 438     fn eq(&self, other: &Self) -> bool {
 439         let Param {
 440             attrs,
 441             ty,
 442             pat,
 443             id,
 444             span: _,
 445             is_placeholder,
 446         } = self;
 447         let Param {
 448             attrs: attrs2,
 449             ty: ty2,
 450             pat: pat2,
 451             id: id2,
 452             span: _,
 453             is_placeholder: is_placeholder2,
 454         } = other;
 455         SpanlessEq::eq(id, id2)
 456             && SpanlessEq::eq(is_placeholder, is_placeholder2)
 457             && (matches!(ty.kind, TyKind::Err)
 458                 || matches!(ty2.kind, TyKind::Err)
 459                 || SpanlessEq::eq(attrs, attrs2)
 460                     && SpanlessEq::eq(ty, ty2)
 461                     && SpanlessEq::eq(pat, pat2))
 462     }
 463 }
 464
 465 impl SpanlessEq for TokenKind {
 466     fn eq(&self, other: &Self) -> bool {
 467         match (self, other) {
 468             (TokenKind::Literal(this), TokenKind::Literal(other)) => SpanlessEq::eq(this, other),
 469             (TokenKind::DotDotEq, _) | (TokenKind::DotDotDot, _) => match other {
 470                 TokenKind::DotDotEq | TokenKind::DotDotDot => true,
 471                 _ => false,
 472             },
 473             (TokenKind::Interpolated(this), TokenKind::Interpolated(other)) => {
 474                 match (this.as_ref(), other.as_ref()) {
 475                     (Nonterminal::NtExpr(this), Nonterminal::NtExpr(other)) => {
 476                         SpanlessEq::eq(this, other)
 477                     }
 478                     _ => this == other,
 479                 }
 480             }
 481             _ => self == other,
 482         }
 483     }
 484 }
 485
 486 impl SpanlessEq for TokenStream {
 487     fn eq(&self, other: &Self) -> bool {
 488         let mut this_trees = self.trees();
 489         let mut other_trees = other.trees();
 490         loop {
 491             let this = match this_trees.next() {
 492                 None => return other_trees.next().is_none(),
 493                 Some(tree) => tree,
 494             };
 495             let other = match other_trees.next() {
 496                 None => return false,
 497                 Some(tree) => tree,
 498             };
 499             if SpanlessEq::eq(&this, &other) {
 500                 continue;
 501             }
 502             if let (TokenTree::Token(this), TokenTree::Token(other)) = (this, other) {
 503                 if match (&this.kind, &other.kind) {
 504                     (TokenKind::Literal(this), TokenKind::Literal(other)) => {
 505                         SpanlessEq::eq(this, other)
 506                     }
 507                     (TokenKind::DocComment(_kind, style, symbol), TokenKind::Pound) => {
 508                         doc_comment(*style, *symbol, &mut other_trees)
 509                     }
 510                     (TokenKind::Pound, TokenKind::DocComment(_kind, style, symbol)) => {
 511                         doc_comment(*style, *symbol, &mut this_trees)
 512                     }
 513                     _ => false,
 514                 } {
 515                     continue;
 516                 }
 517             }
 518             return false;
 519         }
 520     }
 521 }
 522
 523 fn doc_comment<'a>(
 524     style: AttrStyle,
 525     unescaped: Symbol,
 526     trees: &mut impl Iterator<Item = TokenTree>,
 527 ) -> bool {
 528     if match style {
 529         AttrStyle::Outer => false,
 530         AttrStyle::Inner => true,
 531     } {
 532         match trees.next() {
 533             Some(TokenTree::Token(Token {
 534                 kind: TokenKind::Not,
 535                 span: _,
 536             })) => {}
 537             _ => return false,
 538         }
 539     }
 540     let stream = match trees.next() {
 541         Some(TokenTree::Delimited(_span, DelimToken::Bracket, stream)) => stream,
 542         _ => return false,
 543     };
 544     let mut trees = stream.trees();
 545     match trees.next() {
 546         Some(TokenTree::Token(Token {
 547             kind: TokenKind::Ident(symbol, false),
 548             span: _,
 549         })) if symbol == sym::doc => {}
 550         _ => return false,
 551     }
 552     match trees.next() {
 553         Some(TokenTree::Token(Token {
 554             kind: TokenKind::Eq,
 555             span: _,
 556         })) => {}
 557         _ => return false,
 558     }
 559     match trees.next() {
 560         Some(TokenTree::Token(token)) => {
 561             is_escaped_literal(&token, unescaped) && trees.next().is_none()
 562         }
 563         _ => false,
 564     }
 565 }
 566
 567 fn is_escaped_literal(token: &Token, unescaped: Symbol) -> bool {
 568     match match token {
 569         Token {
 570             kind: TokenKind::Literal(lit),
 571             span: _,
 572         } => Lit::from_lit_token(*lit, DUMMY_SP),
 573         Token {
 574             kind: TokenKind::Interpolated(nonterminal),
 575             span: _,
 576         } => match nonterminal.as_ref() {
 577             Nonterminal::NtExpr(expr) => match &expr.kind {
 578                 ExprKind::Lit(lit) => Ok(lit.clone()),
 579                 _ => return false,
 580             },
 581             _ => return false,
 582         },
 583         _ => return false,
 584     } {
 585         Ok(Lit {
 586             token:
 587                 token::Lit {
 588                     kind: token::LitKind::Str,
 589                     symbol: _,
 590                     suffix: None,
 591                 },
 592             kind: LitKind::Str(symbol, StrStyle::Cooked),
 593             span: _,
 594         }) => symbol.as_str().replace('\r', "") == unescaped.as_str().replace('\r', ""),
 595         _ => false,
 596     }
 597 }
 598
 599 impl SpanlessEq for LazyTokenStream {
 600     fn eq(&self, other: &Self) -> bool {
 601         let this = self.create_token_stream();
 602         let other = other.create_token_stream();
 603         SpanlessEq::eq(&this, &other)
 604     }
 605 }
 606
 607 impl SpanlessEq for AttrKind {
 608     fn eq(&self, other: &Self) -> bool {
 609         match (self, other) {
 610             (AttrKind::Normal(item, tokens), AttrKind::Normal(item2, tokens2)) => {
 611                 SpanlessEq::eq(item, item2) && SpanlessEq::eq(tokens, tokens2)
 612             }
 613             (AttrKind::DocComment(kind, symbol), AttrKind::DocComment(kind2, symbol2)) => {
 614                 SpanlessEq::eq(kind, kind2) && SpanlessEq::eq(symbol, symbol2)
 615             }
 616             (AttrKind::DocComment(kind, unescaped), AttrKind::Normal(item2, _tokens)) => {
 617                 match kind {
 618                     CommentKind::Line | CommentKind::Block => {}
 619                 }
 620                 let path = Path::from_ident(Ident::with_dummy_span(sym::doc));
 621                 SpanlessEq::eq(&path, &item2.path)
 622                     && match &item2.args {
 623                         MacArgs::Empty | MacArgs::Delimited(..) => false,
 624                         MacArgs::Eq(_span, token) => is_escaped_literal(token, *unescaped),
 625                     }
 626             }
 627             (AttrKind::Normal(..), AttrKind::DocComment(..)) => SpanlessEq::eq(other, self),
 628         }
 629     }
 630 }