1 //! Utilities for manipulating and extracting information from `rustc_ast::ast`.
3 //! - The `eq_foobar` functions test for semantic equality but ignores `NodeId`s and `Span`s.
5 #![allow(clippy::similar_names, clippy::wildcard_imports, clippy::enum_glob_use)]
7 use crate::{both, over};
8 use if_chain::if_chain;
10 use rustc_ast::{self as ast, *};
11 use rustc_span::symbol::Ident;
15 pub use ident_iter::IdentIter;
17 pub fn is_useless_with_eq_exprs(kind: BinOpKind) -> bool {
21 Sub | Div | Eq | Lt | Le | Gt | Ge | Ne | And | Or | BitXor | BitAnd | BitOr
25 /// Checks if each element in the first slice is contained within the latter as per `eq_fn`.
26 pub fn unordered_over<X>(left: &[X], right: &[X], mut eq_fn: impl FnMut(&X, &X) -> bool) -> bool {
27 left.len() == right.len() && left.iter().all(|l| right.iter().any(|r| eq_fn(l, r)))
30 pub fn eq_id(l: Ident, r: Ident) -> bool {
34 pub fn eq_pat(l: &Pat, r: &Pat) -> bool {
36 match (&l.kind, &r.kind) {
37 (Paren(l), _) => eq_pat(l, r),
38 (_, Paren(r)) => eq_pat(l, r),
39 (Wild, Wild) | (Rest, Rest) => true,
40 (Lit(l), Lit(r)) => eq_expr(l, r),
41 (Ident(b1, i1, s1), Ident(b2, i2, s2)) => b1 == b2 && eq_id(*i1, *i2) && both(s1, s2, |l, r| eq_pat(l, r)),
42 (Range(lf, lt, le), Range(rf, rt, re)) => {
43 eq_expr_opt(lf, rf) && eq_expr_opt(lt, rt) && eq_range_end(&le.node, &re.node)
46 | (Ref(l, Mutability::Not), Ref(r, Mutability::Not))
47 | (Ref(l, Mutability::Mut), Ref(r, Mutability::Mut)) => eq_pat(l, r),
48 (Tuple(l), Tuple(r)) | (Slice(l), Slice(r)) => over(l, r, |l, r| eq_pat(l, r)),
49 (Path(lq, lp), Path(rq, rp)) => both(lq, rq, |l, r| eq_qself(l, r)) && eq_path(lp, rp),
50 (TupleStruct(lqself, lp, lfs), TupleStruct(rqself, rp, rfs)) => eq_maybe_qself(lqself, rqself) && eq_path(lp, rp) && over(lfs, rfs, |l, r| eq_pat(l, r)),
51 (Struct(lqself, lp, lfs, lr), Struct(rqself, rp, rfs, rr)) => {
52 lr == rr && eq_maybe_qself(lqself, rqself) &&eq_path(lp, rp) && unordered_over(lfs, rfs, |lf, rf| eq_field_pat(lf, rf))
54 (Or(ls), Or(rs)) => unordered_over(ls, rs, |l, r| eq_pat(l, r)),
55 (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
60 pub fn eq_range_end(l: &RangeEnd, r: &RangeEnd) -> bool {
62 (RangeEnd::Excluded, RangeEnd::Excluded) => true,
63 (RangeEnd::Included(l), RangeEnd::Included(r)) => {
64 matches!(l, RangeSyntax::DotDotEq) == matches!(r, RangeSyntax::DotDotEq)
70 pub fn eq_field_pat(l: &PatField, r: &PatField) -> bool {
71 l.is_placeholder == r.is_placeholder
72 && eq_id(l.ident, r.ident)
73 && eq_pat(&l.pat, &r.pat)
74 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
77 pub fn eq_qself(l: &QSelf, r: &QSelf) -> bool {
78 l.position == r.position && eq_ty(&l.ty, &r.ty)
81 pub fn eq_maybe_qself(l: &Option<QSelf>, r: &Option<QSelf>) -> bool {
83 (Some(l), Some(r)) => eq_qself(l, r),
89 pub fn eq_path(l: &Path, r: &Path) -> bool {
90 over(&l.segments, &r.segments, |l, r| eq_path_seg(l, r))
93 pub fn eq_path_seg(l: &PathSegment, r: &PathSegment) -> bool {
94 eq_id(l.ident, r.ident) && both(&l.args, &r.args, |l, r| eq_generic_args(l, r))
97 pub fn eq_generic_args(l: &GenericArgs, r: &GenericArgs) -> bool {
99 (GenericArgs::AngleBracketed(l), GenericArgs::AngleBracketed(r)) => {
100 over(&l.args, &r.args, |l, r| eq_angle_arg(l, r))
102 (GenericArgs::Parenthesized(l), GenericArgs::Parenthesized(r)) => {
103 over(&l.inputs, &r.inputs, |l, r| eq_ty(l, r)) && eq_fn_ret_ty(&l.output, &r.output)
109 pub fn eq_angle_arg(l: &AngleBracketedArg, r: &AngleBracketedArg) -> bool {
111 (AngleBracketedArg::Arg(l), AngleBracketedArg::Arg(r)) => eq_generic_arg(l, r),
112 (AngleBracketedArg::Constraint(l), AngleBracketedArg::Constraint(r)) => eq_assoc_constraint(l, r),
117 pub fn eq_generic_arg(l: &GenericArg, r: &GenericArg) -> bool {
119 (GenericArg::Lifetime(l), GenericArg::Lifetime(r)) => eq_id(l.ident, r.ident),
120 (GenericArg::Type(l), GenericArg::Type(r)) => eq_ty(l, r),
121 (GenericArg::Const(l), GenericArg::Const(r)) => eq_expr(&l.value, &r.value),
126 pub fn eq_expr_opt(l: &Option<P<Expr>>, r: &Option<P<Expr>>) -> bool {
127 both(l, r, |l, r| eq_expr(l, r))
130 pub fn eq_struct_rest(l: &StructRest, r: &StructRest) -> bool {
132 (StructRest::Base(lb), StructRest::Base(rb)) => eq_expr(lb, rb),
133 (StructRest::Rest(_), StructRest::Rest(_)) | (StructRest::None, StructRest::None) => true,
138 pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
140 if !over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r)) {
143 match (&l.kind, &r.kind) {
144 (Paren(l), _) => eq_expr(l, r),
145 (_, Paren(r)) => eq_expr(l, r),
147 (Box(l), Box(r)) | (Try(l), Try(r)) | (Await(l), Await(r)) => eq_expr(l, r),
148 (Array(l), Array(r)) | (Tup(l), Tup(r)) => over(l, r, |l, r| eq_expr(l, r)),
149 (Repeat(le, ls), Repeat(re, rs)) => eq_expr(le, re) && eq_expr(&ls.value, &rs.value),
150 (Call(lc, la), Call(rc, ra)) => eq_expr(lc, rc) && over(la, ra, |l, r| eq_expr(l, r)),
151 (MethodCall(lc, la, _), MethodCall(rc, ra, _)) => eq_path_seg(lc, rc) && over(la, ra, |l, r| eq_expr(l, r)),
152 (Binary(lo, ll, lr), Binary(ro, rl, rr)) => lo.node == ro.node && eq_expr(ll, rl) && eq_expr(lr, rr),
153 (Unary(lo, l), Unary(ro, r)) => mem::discriminant(lo) == mem::discriminant(ro) && eq_expr(l, r),
154 (Lit(l), Lit(r)) => l.kind == r.kind,
155 (Cast(l, lt), Cast(r, rt)) | (Type(l, lt), Type(r, rt)) => eq_expr(l, r) && eq_ty(lt, rt),
156 (Let(lp, le), Let(rp, re)) => eq_pat(lp, rp) && eq_expr(le, re),
157 (If(lc, lt, le), If(rc, rt, re)) => eq_expr(lc, rc) && eq_block(lt, rt) && eq_expr_opt(le, re),
158 (While(lc, lt, ll), While(rc, rt, rl)) => eq_label(ll, rl) && eq_expr(lc, rc) && eq_block(lt, rt),
159 (ForLoop(lp, li, lt, ll), ForLoop(rp, ri, rt, rl)) => {
160 eq_label(ll, rl) && eq_pat(lp, rp) && eq_expr(li, ri) && eq_block(lt, rt)
162 (Loop(lt, ll), Loop(rt, rl)) => eq_label(ll, rl) && eq_block(lt, rt),
163 (Block(lb, ll), Block(rb, rl)) => eq_label(ll, rl) && eq_block(lb, rb),
164 (TryBlock(l), TryBlock(r)) => eq_block(l, r),
165 (Yield(l), Yield(r)) | (Ret(l), Ret(r)) => eq_expr_opt(l, r),
166 (Break(ll, le), Break(rl, re)) => eq_label(ll, rl) && eq_expr_opt(le, re),
167 (Continue(ll), Continue(rl)) => eq_label(ll, rl),
168 (Assign(l1, l2, _), Assign(r1, r2, _)) | (Index(l1, l2), Index(r1, r2)) => eq_expr(l1, r1) && eq_expr(l2, r2),
169 (AssignOp(lo, lp, lv), AssignOp(ro, rp, rv)) => lo.node == ro.node && eq_expr(lp, rp) && eq_expr(lv, rv),
170 (Field(lp, lf), Field(rp, rf)) => eq_id(*lf, *rf) && eq_expr(lp, rp),
171 (Match(ls, la), Match(rs, ra)) => eq_expr(ls, rs) && over(la, ra, |l, r| eq_arm(l, r)),
172 (Closure(lc, la, lm, lf, lb, _), Closure(rc, ra, rm, rf, rb, _)) => {
173 lc == rc && la.is_async() == ra.is_async() && lm == rm && eq_fn_decl(lf, rf) && eq_expr(lb, rb)
175 (Async(lc, _, lb), Async(rc, _, rb)) => lc == rc && eq_block(lb, rb),
176 (Range(lf, lt, ll), Range(rf, rt, rl)) => ll == rl && eq_expr_opt(lf, rf) && eq_expr_opt(lt, rt),
177 (AddrOf(lbk, lm, le), AddrOf(rbk, rm, re)) => lbk == rbk && lm == rm && eq_expr(le, re),
178 (Path(lq, lp), Path(rq, rp)) => both(lq, rq, |l, r| eq_qself(l, r)) && eq_path(lp, rp),
179 (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
180 (Struct(lse), Struct(rse)) => {
181 eq_maybe_qself(&lse.qself, &rse.qself)
182 && eq_path(&lse.path, &rse.path)
183 && eq_struct_rest(&lse.rest, &rse.rest)
184 && unordered_over(&lse.fields, &rse.fields, |l, r| eq_field(l, r))
190 pub fn eq_field(l: &ExprField, r: &ExprField) -> bool {
191 l.is_placeholder == r.is_placeholder
192 && eq_id(l.ident, r.ident)
193 && eq_expr(&l.expr, &r.expr)
194 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
197 pub fn eq_arm(l: &Arm, r: &Arm) -> bool {
198 l.is_placeholder == r.is_placeholder
199 && eq_pat(&l.pat, &r.pat)
200 && eq_expr(&l.body, &r.body)
201 && eq_expr_opt(&l.guard, &r.guard)
202 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
205 pub fn eq_label(l: &Option<Label>, r: &Option<Label>) -> bool {
206 both(l, r, |l, r| eq_id(l.ident, r.ident))
209 pub fn eq_block(l: &Block, r: &Block) -> bool {
210 l.rules == r.rules && over(&l.stmts, &r.stmts, |l, r| eq_stmt(l, r))
213 pub fn eq_stmt(l: &Stmt, r: &Stmt) -> bool {
215 match (&l.kind, &r.kind) {
216 (Local(l), Local(r)) => {
217 eq_pat(&l.pat, &r.pat)
218 && both(&l.ty, &r.ty, |l, r| eq_ty(l, r))
219 && eq_expr_opt(&l.init, &r.init)
220 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
222 (Item(l), Item(r)) => eq_item(l, r, eq_item_kind),
223 (Expr(l), Expr(r)) | (Semi(l), Semi(r)) => eq_expr(l, r),
224 (Empty, Empty) => true,
225 (MacCall(l), MacCall(r)) => {
226 l.style == r.style && eq_mac_call(&l.mac, &r.mac) && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
232 pub fn eq_item<K>(l: &Item<K>, r: &Item<K>, mut eq_kind: impl FnMut(&K, &K) -> bool) -> bool {
233 eq_id(l.ident, r.ident)
234 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
235 && eq_vis(&l.vis, &r.vis)
236 && eq_kind(&l.kind, &r.kind)
239 pub fn eq_item_kind(l: &ItemKind, r: &ItemKind) -> bool {
242 (ExternCrate(l), ExternCrate(r)) => l == r,
243 (Use(l), Use(r)) => eq_use_tree(l, r),
244 (Static(lt, lm, le), Static(rt, rm, re)) => lm == rm && eq_ty(lt, rt) && eq_expr_opt(le, re),
245 (Const(ld, lt, le), Const(rd, rt, re)) => eq_defaultness(*ld, *rd) && eq_ty(lt, rt) && eq_expr_opt(le, re),
246 (Fn(box FnKind(ld, lf, lg, lb)), Fn(box FnKind(rd, rf, rg, rb))) => {
247 eq_defaultness(*ld, *rd) && eq_fn_sig(lf, rf) && eq_generics(lg, rg) && both(lb, rb, |l, r| eq_block(l, r))
249 (Mod(lu, lmk), Mod(ru, rmk)) => {
251 && match (lmk, rmk) {
252 (ModKind::Loaded(litems, linline, _), ModKind::Loaded(ritems, rinline, _)) => {
253 linline == rinline && over(litems, ritems, |l, r| eq_item(l, r, eq_item_kind))
255 (ModKind::Unloaded, ModKind::Unloaded) => true,
259 (ForeignMod(l), ForeignMod(r)) => {
260 both(&l.abi, &r.abi, |l, r| eq_str_lit(l, r))
261 && over(&l.items, &r.items, |l, r| eq_item(l, r, eq_foreign_item_kind))
263 (TyAlias(box TyAliasKind(ld, lg, lb, lt)), TyAlias(box TyAliasKind(rd, rg, rb, rt))) => {
264 eq_defaultness(*ld, *rd)
265 && eq_generics(lg, rg)
266 && over(lb, rb, |l, r| eq_generic_bound(l, r))
267 && both(lt, rt, |l, r| eq_ty(l, r))
269 (Enum(le, lg), Enum(re, rg)) => {
270 over(&le.variants, &re.variants, |l, r| eq_variant(l, r)) && eq_generics(lg, rg)
272 (Struct(lv, lg), Struct(rv, rg)) | (Union(lv, lg), Union(rv, rg)) => {
273 eq_variant_data(lv, rv) && eq_generics(lg, rg)
275 (Trait(box TraitKind(la, lu, lg, lb, li)), Trait(box TraitKind(ra, ru, rg, rb, ri))) => {
277 && matches!(lu, Unsafe::No) == matches!(ru, Unsafe::No)
278 && eq_generics(lg, rg)
279 && over(lb, rb, |l, r| eq_generic_bound(l, r))
280 && over(li, ri, |l, r| eq_item(l, r, eq_assoc_item_kind))
282 (TraitAlias(lg, lb), TraitAlias(rg, rb)) => eq_generics(lg, rg) && over(lb, rb, |l, r| eq_generic_bound(l, r)),
305 matches!(lu, Unsafe::No) == matches!(ru, Unsafe::No)
306 && matches!(lp, ImplPolarity::Positive) == matches!(rp, ImplPolarity::Positive)
307 && eq_defaultness(*ld, *rd)
308 && matches!(lc, ast::Const::No) == matches!(rc, ast::Const::No)
309 && eq_generics(lg, rg)
310 && both(lot, rot, |l, r| eq_path(&l.path, &r.path))
312 && over(li, ri, |l, r| eq_item(l, r, eq_assoc_item_kind))
314 (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
315 (MacroDef(l), MacroDef(r)) => l.macro_rules == r.macro_rules && eq_mac_args(&l.body, &r.body),
320 pub fn eq_foreign_item_kind(l: &ForeignItemKind, r: &ForeignItemKind) -> bool {
321 use ForeignItemKind::*;
323 (Static(lt, lm, le), Static(rt, rm, re)) => lm == rm && eq_ty(lt, rt) && eq_expr_opt(le, re),
324 (Fn(box FnKind(ld, lf, lg, lb)), Fn(box FnKind(rd, rf, rg, rb))) => {
325 eq_defaultness(*ld, *rd) && eq_fn_sig(lf, rf) && eq_generics(lg, rg) && both(lb, rb, |l, r| eq_block(l, r))
327 (TyAlias(box TyAliasKind(ld, lg, lb, lt)), TyAlias(box TyAliasKind(rd, rg, rb, rt))) => {
328 eq_defaultness(*ld, *rd)
329 && eq_generics(lg, rg)
330 && over(lb, rb, |l, r| eq_generic_bound(l, r))
331 && both(lt, rt, |l, r| eq_ty(l, r))
333 (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
338 pub fn eq_assoc_item_kind(l: &AssocItemKind, r: &AssocItemKind) -> bool {
339 use AssocItemKind::*;
341 (Const(ld, lt, le), Const(rd, rt, re)) => eq_defaultness(*ld, *rd) && eq_ty(lt, rt) && eq_expr_opt(le, re),
342 (Fn(box FnKind(ld, lf, lg, lb)), Fn(box FnKind(rd, rf, rg, rb))) => {
343 eq_defaultness(*ld, *rd) && eq_fn_sig(lf, rf) && eq_generics(lg, rg) && both(lb, rb, |l, r| eq_block(l, r))
345 (TyAlias(box TyAliasKind(ld, lg, lb, lt)), TyAlias(box TyAliasKind(rd, rg, rb, rt))) => {
346 eq_defaultness(*ld, *rd)
347 && eq_generics(lg, rg)
348 && over(lb, rb, |l, r| eq_generic_bound(l, r))
349 && both(lt, rt, |l, r| eq_ty(l, r))
351 (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
356 pub fn eq_variant(l: &Variant, r: &Variant) -> bool {
357 l.is_placeholder == r.is_placeholder
358 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
359 && eq_vis(&l.vis, &r.vis)
360 && eq_id(l.ident, r.ident)
361 && eq_variant_data(&l.data, &r.data)
362 && both(&l.disr_expr, &r.disr_expr, |l, r| eq_expr(&l.value, &r.value))
365 pub fn eq_variant_data(l: &VariantData, r: &VariantData) -> bool {
368 (Unit(_), Unit(_)) => true,
369 (Struct(l, _), Struct(r, _)) | (Tuple(l, _), Tuple(r, _)) => over(l, r, |l, r| eq_struct_field(l, r)),
374 pub fn eq_struct_field(l: &FieldDef, r: &FieldDef) -> bool {
375 l.is_placeholder == r.is_placeholder
376 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
377 && eq_vis(&l.vis, &r.vis)
378 && both(&l.ident, &r.ident, |l, r| eq_id(*l, *r))
379 && eq_ty(&l.ty, &r.ty)
382 pub fn eq_fn_sig(l: &FnSig, r: &FnSig) -> bool {
383 eq_fn_decl(&l.decl, &r.decl) && eq_fn_header(&l.header, &r.header)
386 pub fn eq_fn_header(l: &FnHeader, r: &FnHeader) -> bool {
387 matches!(l.unsafety, Unsafe::No) == matches!(r.unsafety, Unsafe::No)
388 && l.asyncness.is_async() == r.asyncness.is_async()
389 && matches!(l.constness, Const::No) == matches!(r.constness, Const::No)
390 && eq_ext(&l.ext, &r.ext)
393 pub fn eq_generics(l: &Generics, r: &Generics) -> bool {
394 over(&l.params, &r.params, |l, r| eq_generic_param(l, r))
395 && over(&l.where_clause.predicates, &r.where_clause.predicates, |l, r| {
396 eq_where_predicate(l, r)
400 pub fn eq_where_predicate(l: &WherePredicate, r: &WherePredicate) -> bool {
401 use WherePredicate::*;
403 (BoundPredicate(l), BoundPredicate(r)) => {
404 over(&l.bound_generic_params, &r.bound_generic_params, |l, r| {
405 eq_generic_param(l, r)
406 }) && eq_ty(&l.bounded_ty, &r.bounded_ty)
407 && over(&l.bounds, &r.bounds, |l, r| eq_generic_bound(l, r))
409 (RegionPredicate(l), RegionPredicate(r)) => {
410 eq_id(l.lifetime.ident, r.lifetime.ident) && over(&l.bounds, &r.bounds, |l, r| eq_generic_bound(l, r))
412 (EqPredicate(l), EqPredicate(r)) => eq_ty(&l.lhs_ty, &r.lhs_ty) && eq_ty(&l.rhs_ty, &r.rhs_ty),
417 pub fn eq_use_tree(l: &UseTree, r: &UseTree) -> bool {
418 eq_path(&l.prefix, &r.prefix) && eq_use_tree_kind(&l.kind, &r.kind)
421 pub fn eq_anon_const(l: &AnonConst, r: &AnonConst) -> bool {
422 eq_expr(&l.value, &r.value)
425 pub fn eq_use_tree_kind(l: &UseTreeKind, r: &UseTreeKind) -> bool {
428 (Glob, Glob) => true,
429 (Simple(l, _, _), Simple(r, _, _)) => both(l, r, |l, r| eq_id(*l, *r)),
430 (Nested(l), Nested(r)) => over(l, r, |(l, _), (r, _)| eq_use_tree(l, r)),
435 pub fn eq_defaultness(l: Defaultness, r: Defaultness) -> bool {
438 (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_))
442 pub fn eq_vis(l: &Visibility, r: &Visibility) -> bool {
443 use VisibilityKind::*;
444 match (&l.kind, &r.kind) {
445 (Public, Public) | (Inherited, Inherited) | (Crate(_), Crate(_)) => true,
446 (Restricted { path: l, .. }, Restricted { path: r, .. }) => eq_path(l, r),
451 pub fn eq_fn_decl(l: &FnDecl, r: &FnDecl) -> bool {
452 eq_fn_ret_ty(&l.output, &r.output)
453 && over(&l.inputs, &r.inputs, |l, r| {
454 l.is_placeholder == r.is_placeholder
455 && eq_pat(&l.pat, &r.pat)
456 && eq_ty(&l.ty, &r.ty)
457 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
461 pub fn eq_fn_ret_ty(l: &FnRetTy, r: &FnRetTy) -> bool {
463 (FnRetTy::Default(_), FnRetTy::Default(_)) => true,
464 (FnRetTy::Ty(l), FnRetTy::Ty(r)) => eq_ty(l, r),
469 pub fn eq_ty(l: &Ty, r: &Ty) -> bool {
471 match (&l.kind, &r.kind) {
472 (Paren(l), _) => eq_ty(l, r),
473 (_, Paren(r)) => eq_ty(l, r),
474 (Never, Never) | (Infer, Infer) | (ImplicitSelf, ImplicitSelf) | (Err, Err) | (CVarArgs, CVarArgs) => true,
475 (Slice(l), Slice(r)) => eq_ty(l, r),
476 (Array(le, ls), Array(re, rs)) => eq_ty(le, re) && eq_expr(&ls.value, &rs.value),
477 (Ptr(l), Ptr(r)) => l.mutbl == r.mutbl && eq_ty(&l.ty, &r.ty),
478 (Rptr(ll, l), Rptr(rl, r)) => {
479 both(ll, rl, |l, r| eq_id(l.ident, r.ident)) && l.mutbl == r.mutbl && eq_ty(&l.ty, &r.ty)
481 (BareFn(l), BareFn(r)) => {
482 l.unsafety == r.unsafety
483 && eq_ext(&l.ext, &r.ext)
484 && over(&l.generic_params, &r.generic_params, |l, r| eq_generic_param(l, r))
485 && eq_fn_decl(&l.decl, &r.decl)
487 (Tup(l), Tup(r)) => over(l, r, |l, r| eq_ty(l, r)),
488 (Path(lq, lp), Path(rq, rp)) => both(lq, rq, |l, r| eq_qself(l, r)) && eq_path(lp, rp),
489 (TraitObject(lg, ls), TraitObject(rg, rs)) => ls == rs && over(lg, rg, |l, r| eq_generic_bound(l, r)),
490 (ImplTrait(_, lg), ImplTrait(_, rg)) => over(lg, rg, |l, r| eq_generic_bound(l, r)),
491 (Typeof(l), Typeof(r)) => eq_expr(&l.value, &r.value),
492 (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
497 pub fn eq_ext(l: &Extern, r: &Extern) -> bool {
500 (None, None) | (Implicit, Implicit) => true,
501 (Explicit(l), Explicit(r)) => eq_str_lit(l, r),
506 pub fn eq_str_lit(l: &StrLit, r: &StrLit) -> bool {
507 l.style == r.style && l.symbol == r.symbol && l.suffix == r.suffix
510 pub fn eq_poly_ref_trait(l: &PolyTraitRef, r: &PolyTraitRef) -> bool {
511 eq_path(&l.trait_ref.path, &r.trait_ref.path)
512 && over(&l.bound_generic_params, &r.bound_generic_params, |l, r| {
513 eq_generic_param(l, r)
517 pub fn eq_generic_param(l: &GenericParam, r: &GenericParam) -> bool {
518 use GenericParamKind::*;
519 l.is_placeholder == r.is_placeholder
520 && eq_id(l.ident, r.ident)
521 && over(&l.bounds, &r.bounds, |l, r| eq_generic_bound(l, r))
522 && match (&l.kind, &r.kind) {
523 (Lifetime, Lifetime) => true,
524 (Type { default: l }, Type { default: r }) => both(l, r, |l, r| eq_ty(l, r)),
536 ) => eq_ty(lt, rt) && both(ld, rd, |ld, rd| eq_anon_const(ld, rd)),
539 && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r))
542 pub fn eq_generic_bound(l: &GenericBound, r: &GenericBound) -> bool {
545 (Trait(ptr1, tbm1), Trait(ptr2, tbm2)) => tbm1 == tbm2 && eq_poly_ref_trait(ptr1, ptr2),
546 (Outlives(l), Outlives(r)) => eq_id(l.ident, r.ident),
551 pub fn eq_assoc_constraint(l: &AssocTyConstraint, r: &AssocTyConstraint) -> bool {
552 use AssocTyConstraintKind::*;
553 eq_id(l.ident, r.ident)
554 && match (&l.kind, &r.kind) {
555 (Equality { ty: l }, Equality { ty: r }) => eq_ty(l, r),
556 (Bound { bounds: l }, Bound { bounds: r }) => over(l, r, |l, r| eq_generic_bound(l, r)),
561 pub fn eq_mac_call(l: &MacCall, r: &MacCall) -> bool {
562 eq_path(&l.path, &r.path) && eq_mac_args(&l.args, &r.args)
565 pub fn eq_attr(l: &Attribute, r: &Attribute) -> bool {
568 && match (&l.kind, &r.kind) {
569 (DocComment(l1, l2), DocComment(r1, r2)) => l1 == r1 && l2 == r2,
570 (Normal(l, _), Normal(r, _)) => eq_path(&l.path, &r.path) && eq_mac_args(&l.args, &r.args),
575 pub fn eq_mac_args(l: &MacArgs, r: &MacArgs) -> bool {
578 (Empty, Empty) => true,
579 (Delimited(_, ld, lts), Delimited(_, rd, rts)) => ld == rd && lts.eq_unspanned(rts),
580 (Eq(_, lt), Eq(_, rt)) => lt.kind == rt.kind,
585 /// Extract args from an assert-like macro.
587 /// Currently working with:
588 /// - `assert_eq!` and `assert_ne!`
589 /// - `debug_assert_eq!` and `debug_assert_ne!`
593 /// `debug_assert_eq!(a, b)` will return Some([a, b])
594 pub fn extract_assert_macro_args(mut expr: &Expr) -> Option<[&Expr; 2]> {
596 if let ExprKind::If(_, ref block, _) = expr.kind;
597 if let StmtKind::Semi(ref e) = block.stmts.get(0)?.kind;
603 if let ExprKind::Block(ref block, _) = expr.kind;
604 if let StmtKind::Expr(ref expr) = block.stmts.get(0)?.kind;
605 if let ExprKind::Match(ref match_expr, _) = expr.kind;
606 if let ExprKind::Tup(ref tup) = match_expr.kind;
607 if let [a, b, ..] = tup.as_slice();
608 if let (&ExprKind::AddrOf(_, _, ref a), &ExprKind::AddrOf(_, _, ref b)) = (&a.kind, &b.kind);
610 return Some([&*a, &*b]);