1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
//! [![github]](https://github.com/dtolnay/quote) [![crates-io]](https://crates.io/crates/quote) [![docs-rs]](https://docs.rs/quote)
//!
//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs
//!
//! <br>
//!
//! This crate provides the [`quote!`] macro for turning Rust syntax tree data
//! structures into tokens of source code.
//!
//! [`quote!`]: macro.quote.html
//!
//! Procedural macros in Rust receive a stream of tokens as input, execute
//! arbitrary Rust code to determine how to manipulate those tokens, and produce
//! a stream of tokens to hand back to the compiler to compile into the caller's
//! crate. Quasi-quoting is a solution to one piece of that &mdash; producing
//! tokens to return to the compiler.
//!
//! The idea of quasi-quoting is that we write *code* that we treat as *data*.
//! Within the `quote!` macro, we can write what looks like code to our text
//! editor or IDE. We get all the benefits of the editor's brace matching,
//! syntax highlighting, indentation, and maybe autocompletion. But rather than
//! compiling that as code into the current crate, we can treat it as data, pass
//! it around, mutate it, and eventually hand it back to the compiler as tokens
//! to compile into the macro caller's crate.
//!
//! This crate is motivated by the procedural macro use case, but is a
//! general-purpose Rust quasi-quoting library and is not specific to procedural
//! macros.
//!
//! ```toml
//! [dependencies]
//! quote = "1.0"
//! ```
//!
//! <br>
//!
//! # Example
//!
//! The following quasi-quoted block of code is something you might find in [a]
//! procedural macro having to do with data structure serialization. The `#var`
//! syntax performs interpolation of runtime variables into the quoted tokens.
//! Check out the documentation of the [`quote!`] macro for more detail about
//! the syntax. See also the [`quote_spanned!`] macro which is important for
//! implementing hygienic procedural macros.
//!
//! [a]: https://serde.rs/
//! [`quote_spanned!`]: macro.quote_spanned.html
//!
//! ```
//! # use quote::quote;
//! #
//! # let generics = "";
//! # let where_clause = "";
//! # let field_ty = "";
//! # let item_ty = "";
//! # let path = "";
//! # let value = "";
//! #
//! let tokens = quote! {
//!     struct SerializeWith #generics #where_clause {
//!         value: &'a #field_ty,
//!         phantom: core::marker::PhantomData<#item_ty>,
//!     }
//!
//!     impl #generics serde::Serialize for SerializeWith #generics #where_clause {
//!         fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
//!         where
//!             S: serde::Serializer,
//!         {
//!             #path(self.value, serializer)
//!         }
//!     }
//!
//!     SerializeWith {
//!         value: #value,
//!         phantom: core::marker::PhantomData::<#item_ty>,
//!     }
//! };
//! ```
//!
//! <br>
//!
//! # Non-macro code generators
//!
//! When using `quote` in a build.rs or main.rs and writing the output out to a
//! file, consider having the code generator pass the tokens through
//! [prettyplease] before writing. This way if an error occurs in the generated
//! code it is convenient for a human to read and debug.
//!
//! [prettyplease]: https://github.com/dtolnay/prettyplease

// Quote types in rustdoc of other crates get linked to here.
#![doc(html_root_url = "https://docs.rs/quote/1.0.37")]
#![allow(
    clippy::doc_markdown,
    clippy::missing_errors_doc,
    clippy::missing_panics_doc,
    clippy::module_name_repetitions,
    // false positive https://github.com/rust-lang/rust-clippy/issues/6983
    clippy::wrong_self_convention,
)]

extern crate alloc;

#[cfg(feature = "proc-macro")]
extern crate proc_macro;

mod ext;
mod format;
mod ident_fragment;
mod to_tokens;

// Not public API.
#[doc(hidden)]
#[path = "runtime.rs"]
pub mod __private;

pub use crate::ext::TokenStreamExt;
pub use crate::ident_fragment::IdentFragment;
pub use crate::to_tokens::ToTokens;

// Not public API.
#[doc(hidden)]
pub mod spanned;

macro_rules! __quote {
    ($quote:item) => {
        /// The whole point.
        ///
        /// Performs variable interpolation against the input and produces it as
        /// [`proc_macro2::TokenStream`].
        ///
        /// Note: for returning tokens to the compiler in a procedural macro, use
        /// `.into()` on the result to convert to [`proc_macro::TokenStream`].
        ///
        /// [`TokenStream`]: https://docs.rs/proc-macro2/1.0/proc_macro2/struct.TokenStream.html
        ///
        /// <br>
        ///
        /// # Interpolation
        ///
        /// Variable interpolation is done with `#var` (similar to `$var` in
        /// `macro_rules!` macros). This grabs the `var` variable that is currently in
        /// scope and inserts it in that location in the output tokens. Any type
        /// implementing the [`ToTokens`] trait can be interpolated. This includes most
        /// Rust primitive types as well as most of the syntax tree types from the [Syn]
        /// crate.
        ///
        /// [`ToTokens`]: trait.ToTokens.html
        /// [Syn]: https://github.com/dtolnay/syn
        ///
        /// Repetition is done using `#(...)*` or `#(...),*` again similar to
        /// `macro_rules!`. This iterates through the elements of any variable
        /// interpolated within the repetition and inserts a copy of the repetition body
        /// for each one. The variables in an interpolation may be a `Vec`, slice,
        /// `BTreeSet`, or any `Iterator`.
        ///
        /// - `#(#var)*` — no separators
        /// - `#(#var),*` — the character before the asterisk is used as a separator
        /// - `#( struct #var; )*` — the repetition can contain other tokens
        /// - `#( #k => println!("{}", #v), )*` — even multiple interpolations
        ///
        /// <br>
        ///
        /// # Hygiene
        ///
        /// Any interpolated tokens preserve the `Span` information provided by their
        /// `ToTokens` implementation. Tokens that originate within the `quote!`
        /// invocation are spanned with [`Span::call_site()`].
        ///
        /// [`Span::call_site()`]: https://docs.rs/proc-macro2/1.0/proc_macro2/struct.Span.html#method.call_site
        ///
        /// A different span can be provided through the [`quote_spanned!`] macro.
        ///
        /// [`quote_spanned!`]: macro.quote_spanned.html
        ///
        /// <br>
        ///
        /// # Return type
        ///
        /// The macro evaluates to an expression of type `proc_macro2::TokenStream`.
        /// Meanwhile Rust procedural macros are expected to return the type
        /// `proc_macro::TokenStream`.
        ///
        /// The difference between the two types is that `proc_macro` types are entirely
        /// specific to procedural macros and cannot ever exist in code outside of a
        /// procedural macro, while `proc_macro2` types may exist anywhere including
        /// tests and non-macro code like main.rs and build.rs. This is why even the
        /// procedural macro ecosystem is largely built around `proc_macro2`, because
        /// that ensures the libraries are unit testable and accessible in non-macro
        /// contexts.
        ///
        /// There is a [`From`]-conversion in both directions so returning the output of
        /// `quote!` from a procedural macro usually looks like `tokens.into()` or
        /// `proc_macro::TokenStream::from(tokens)`.
        ///
        /// [`From`]: https://doc.rust-lang.org/std/convert/trait.From.html
        ///
        /// <br>
        ///
        /// # Examples
        ///
        /// ### Procedural macro
        ///
        /// The structure of a basic procedural macro is as follows. Refer to the [Syn]
        /// crate for further useful guidance on using `quote!` as part of a procedural
        /// macro.
        ///
        /// [Syn]: https://github.com/dtolnay/syn
        ///
        /// ```
        /// # #[cfg(any())]
        /// extern crate proc_macro;
        /// # extern crate proc_macro2;
        ///
        /// # #[cfg(any())]
        /// use proc_macro::TokenStream;
        /// # use proc_macro2::TokenStream;
        /// use quote::quote;
        ///
        /// # const IGNORE_TOKENS: &'static str = stringify! {
        /// #[proc_macro_derive(HeapSize)]
        /// # };
        /// pub fn derive_heap_size(input: TokenStream) -> TokenStream {
        ///     // Parse the input and figure out what implementation to generate...
        ///     # const IGNORE_TOKENS: &'static str = stringify! {
        ///     let name = /* ... */;
        ///     let expr = /* ... */;
        ///     # };
        ///     #
        ///     # let name = 0;
        ///     # let expr = 0;
        ///
        ///     let expanded = quote! {
        ///         // The generated impl.
        ///         impl heapsize::HeapSize for #name {
        ///             fn heap_size_of_children(&self) -> usize {
        ///                 #expr
        ///             }
        ///         }
        ///     };
        ///
        ///     // Hand the output tokens back to the compiler.
        ///     TokenStream::from(expanded)
        /// }
        /// ```
        ///
        /// <p><br></p>
        ///
        /// ### Combining quoted fragments
        ///
        /// Usually you don't end up constructing an entire final `TokenStream` in one
        /// piece. Different parts may come from different helper functions. The tokens
        /// produced by `quote!` themselves implement `ToTokens` and so can be
        /// interpolated into later `quote!` invocations to build up a final result.
        ///
        /// ```
        /// # use quote::quote;
        /// #
        /// let type_definition = quote! {...};
        /// let methods = quote! {...};
        ///
        /// let tokens = quote! {
        ///     #type_definition
        ///     #methods
        /// };
        /// ```
        ///
        /// <p><br></p>
        ///
        /// ### Constructing identifiers
        ///
        /// Suppose we have an identifier `ident` which came from somewhere in a macro
        /// input and we need to modify it in some way for the macro output. Let's
        /// consider prepending the identifier with an underscore.
        ///
        /// Simply interpolating the identifier next to an underscore will not have the
        /// behavior of concatenating them. The underscore and the identifier will
        /// continue to be two separate tokens as if you had written `_ x`.
        ///
        /// ```
        /// # use proc_macro2::{self as syn, Span};
        /// # use quote::quote;
        /// #
        /// # let ident = syn::Ident::new("i", Span::call_site());
        /// #
        /// // incorrect
        /// quote! {
        ///     let mut _#ident = 0;
        /// }
        /// # ;
        /// ```
        ///
        /// The solution is to build a new identifier token with the correct value. As
        /// this is such a common case, the [`format_ident!`] macro provides a
        /// convenient utility for doing so correctly.
        ///
        /// ```
        /// # use proc_macro2::{Ident, Span};
        /// # use quote::{format_ident, quote};
        /// #
        /// # let ident = Ident::new("i", Span::call_site());
        /// #
        /// let varname = format_ident!("_{}", ident);
        /// quote! {
        ///     let mut #varname = 0;
        /// }
        /// # ;
        /// ```
        ///
        /// Alternatively, the APIs provided by Syn and proc-macro2 can be used to
        /// directly build the identifier. This is roughly equivalent to the above, but
        /// will not handle `ident` being a raw identifier.
        ///
        /// ```
        /// # use proc_macro2::{self as syn, Span};
        /// # use quote::quote;
        /// #
        /// # let ident = syn::Ident::new("i", Span::call_site());
        /// #
        /// let concatenated = format!("_{}", ident);
        /// let varname = syn::Ident::new(&concatenated, ident.span());
        /// quote! {
        ///     let mut #varname = 0;
        /// }
        /// # ;
        /// ```
        ///
        /// <p><br></p>
        ///
        /// ### Making method calls
        ///
        /// Let's say our macro requires some type specified in the macro input to have
        /// a constructor called `new`. We have the type in a variable called
        /// `field_type` of type `syn::Type` and want to invoke the constructor.
        ///
        /// ```
        /// # use quote::quote;
        /// #
        /// # let field_type = quote!(...);
        /// #
        /// // incorrect
        /// quote! {
        ///     let value = #field_type::new();
        /// }
        /// # ;
        /// ```
        ///
        /// This works only sometimes. If `field_type` is `String`, the expanded code
        /// contains `String::new()` which is fine. But if `field_type` is something
        /// like `Vec<i32>` then the expanded code is `Vec<i32>::new()` which is invalid
        /// syntax. Ordinarily in handwritten Rust we would write `Vec::<i32>::new()`
        /// but for macros often the following is more convenient.
        ///
        /// ```
        /// # use quote::quote;
        /// #
        /// # let field_type = quote!(...);
        /// #
        /// quote! {
        ///     let value = <#field_type>::new();
        /// }
        /// # ;
        /// ```
        ///
        /// This expands to `<Vec<i32>>::new()` which behaves correctly.
        ///
        /// A similar pattern is appropriate for trait methods.
        ///
        /// ```
        /// # use quote::quote;
        /// #
        /// # let field_type = quote!(...);
        /// #
        /// quote! {
        ///     let value = <#field_type as core::default::Default>::default();
        /// }
        /// # ;
        /// ```
        ///
        /// <p><br></p>
        ///
        /// ### Interpolating text inside of doc comments
        ///
        /// Neither doc comments nor string literals get interpolation behavior in
        /// quote:
        ///
        /// ```compile_fail
        /// quote! {
        ///     /// try to interpolate: #ident
        ///     ///
        ///     /// ...
        /// }
        /// ```
        ///
        /// ```compile_fail
        /// quote! {
        ///     #[doc = "try to interpolate: #ident"]
        /// }
        /// ```
        ///
        /// Instead the best way to build doc comments that involve variables is by
        /// formatting the doc string literal outside of quote.
        ///
        /// ```rust
        /// # use proc_macro2::{Ident, Span};
        /// # use quote::quote;
        /// #
        /// # const IGNORE: &str = stringify! {
        /// let msg = format!(...);
        /// # };
        /// #
        /// # let ident = Ident::new("var", Span::call_site());
        /// # let msg = format!("try to interpolate: {}", ident);
        /// quote! {
        ///     #[doc = #msg]
        ///     ///
        ///     /// ...
        /// }
        /// # ;
        /// ```
        ///
        /// <p><br></p>
        ///
        /// ### Indexing into a tuple struct
        ///
        /// When interpolating indices of a tuple or tuple struct, we need them not to
        /// appears suffixed as integer literals by interpolating them as [`syn::Index`]
        /// instead.
        ///
        /// [`syn::Index`]: https://docs.rs/syn/2.0/syn/struct.Index.html
        ///
        /// ```compile_fail
        /// let i = 0usize..self.fields.len();
        ///
        /// // expands to 0 + self.0usize.heap_size() + self.1usize.heap_size() + ...
        /// // which is not valid syntax
        /// quote! {
        ///     0 #( + self.#i.heap_size() )*
        /// }
        /// ```
        ///
        /// ```
        /// # use proc_macro2::{Ident, TokenStream};
        /// # use quote::quote;
        /// #
        /// # mod syn {
        /// #     use proc_macro2::{Literal, TokenStream};
        /// #     use quote::{ToTokens, TokenStreamExt};
        /// #
        /// #     pub struct Index(usize);
        /// #
        /// #     impl From<usize> for Index {
        /// #         fn from(i: usize) -> Self {
        /// #             Index(i)
        /// #         }
        /// #     }
        /// #
        /// #     impl ToTokens for Index {
        /// #         fn to_tokens(&self, tokens: &mut TokenStream) {
        /// #             tokens.append(Literal::usize_unsuffixed(self.0));
        /// #         }
        /// #     }
        /// # }
        /// #
        /// # struct Struct {
        /// #     fields: Vec<Ident>,
        /// # }
        /// #
        /// # impl Struct {
        /// #     fn example(&self) -> TokenStream {
        /// let i = (0..self.fields.len()).map(syn::Index::from);
        ///
        /// // expands to 0 + self.0.heap_size() + self.1.heap_size() + ...
        /// quote! {
        ///     0 #( + self.#i.heap_size() )*
        /// }
        /// #     }
        /// # }
        /// ```
        $quote
    };
}

#[cfg(doc)]
__quote![
    #[macro_export]
    macro_rules! quote {
        ($($tt:tt)*) => {
            ...
        };
    }
];

#[cfg(not(doc))]
__quote![
    #[macro_export]
    macro_rules! quote {
        () => {
            $crate::__private::TokenStream::new()
        };

        // Special case rule for a single tt, for performance.
        ($tt:tt) => {{
            let mut _s = $crate::__private::TokenStream::new();
            $crate::quote_token!{$tt _s}
            _s
        }};

        // Special case rules for two tts, for performance.
        (# $var:ident) => {{
            let mut _s = $crate::__private::TokenStream::new();
            $crate::ToTokens::to_tokens(&$var, &mut _s);
            _s
        }};
        ($tt1:tt $tt2:tt) => {{
            let mut _s = $crate::__private::TokenStream::new();
            $crate::quote_token!{$tt1 _s}
            $crate::quote_token!{$tt2 _s}
            _s
        }};

        // Rule for any other number of tokens.
        ($($tt:tt)*) => {{
            let mut _s = $crate::__private::TokenStream::new();
            $crate::quote_each_token!{_s $($tt)*}
            _s
        }};
    }
];

macro_rules! __quote_spanned {
    ($quote_spanned:item) => {
        /// Same as `quote!`, but applies a given span to all tokens originating within
        /// the macro invocation.
        ///
        /// <br>
        ///
        /// # Syntax
        ///
        /// A span expression of type [`Span`], followed by `=>`, followed by the tokens
        /// to quote. The span expression should be brief &mdash; use a variable for
        /// anything more than a few characters. There should be no space before the
        /// `=>` token.
        ///
        /// [`Span`]: https://docs.rs/proc-macro2/1.0/proc_macro2/struct.Span.html
        ///
        /// ```
        /// # use proc_macro2::Span;
        /// # use quote::quote_spanned;
        /// #
        /// # const IGNORE_TOKENS: &'static str = stringify! {
        /// let span = /* ... */;
        /// # };
        /// # let span = Span::call_site();
        /// # let init = 0;
        ///
        /// // On one line, use parentheses.
        /// let tokens = quote_spanned!(span=> Box::into_raw(Box::new(#init)));
        ///
        /// // On multiple lines, place the span at the top and use braces.
        /// let tokens = quote_spanned! {span=>
        ///     Box::into_raw(Box::new(#init))
        /// };
        /// ```
        ///
        /// The lack of space before the `=>` should look jarring to Rust programmers
        /// and this is intentional. The formatting is designed to be visibly
        /// off-balance and draw the eye a particular way, due to the span expression
        /// being evaluated in the context of the procedural macro and the remaining
        /// tokens being evaluated in the generated code.
        ///
        /// <br>
        ///
        /// # Hygiene
        ///
        /// Any interpolated tokens preserve the `Span` information provided by their
        /// `ToTokens` implementation. Tokens that originate within the `quote_spanned!`
        /// invocation are spanned with the given span argument.
        ///
        /// <br>
        ///
        /// # Example
        ///
        /// The following procedural macro code uses `quote_spanned!` to assert that a
        /// particular Rust type implements the [`Sync`] trait so that references can be
        /// safely shared between threads.
        ///
        /// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
        ///
        /// ```
        /// # use quote::{quote_spanned, TokenStreamExt, ToTokens};
        /// # use proc_macro2::{Span, TokenStream};
        /// #
        /// # struct Type;
        /// #
        /// # impl Type {
        /// #     fn span(&self) -> Span {
        /// #         Span::call_site()
        /// #     }
        /// # }
        /// #
        /// # impl ToTokens for Type {
        /// #     fn to_tokens(&self, _tokens: &mut TokenStream) {}
        /// # }
        /// #
        /// # let ty = Type;
        /// # let call_site = Span::call_site();
        /// #
        /// let ty_span = ty.span();
        /// let assert_sync = quote_spanned! {ty_span=>
        ///     struct _AssertSync where #ty: Sync;
        /// };
        /// ```
        ///
        /// If the assertion fails, the user will see an error like the following. The
        /// input span of their type is highlighted in the error.
        ///
        /// ```text
        /// error[E0277]: the trait bound `*const (): std::marker::Sync` is not satisfied
        ///   --> src/main.rs:10:21
        ///    |
        /// 10 |     static ref PTR: *const () = &();
        ///    |                     ^^^^^^^^^ `*const ()` cannot be shared between threads safely
        /// ```
        ///
        /// In this example it is important for the where-clause to be spanned with the
        /// line/column information of the user's input type so that error messages are
        /// placed appropriately by the compiler.
        $quote_spanned
    };
}

#[cfg(doc)]
__quote_spanned![
    #[macro_export]
    macro_rules! quote_spanned {
        ($span:expr=> $($tt:tt)*) => {
            ...
        };
    }
];

#[cfg(not(doc))]
__quote_spanned![
    #[macro_export]
    macro_rules! quote_spanned {
        ($span:expr=>) => {{
            let _: $crate::__private::Span = $crate::__private::get_span($span).__into_span();
            $crate::__private::TokenStream::new()
        }};

        // Special case rule for a single tt, for performance.
        ($span:expr=> $tt:tt) => {{
            let mut _s = $crate::__private::TokenStream::new();
            let _span: $crate::__private::Span = $crate::__private::get_span($span).__into_span();
            $crate::quote_token_spanned!{$tt _s _span}
            _s
        }};

        // Special case rules for two tts, for performance.
        ($span:expr=> # $var:ident) => {{
            let mut _s = $crate::__private::TokenStream::new();
            let _: $crate::__private::Span = $crate::__private::get_span($span).__into_span();
            $crate::ToTokens::to_tokens(&$var, &mut _s);
            _s
        }};
        ($span:expr=> $tt1:tt $tt2:tt) => {{
            let mut _s = $crate::__private::TokenStream::new();
            let _span: $crate::__private::Span = $crate::__private::get_span($span).__into_span();
            $crate::quote_token_spanned!{$tt1 _s _span}
            $crate::quote_token_spanned!{$tt2 _s _span}
            _s
        }};

        // Rule for any other number of tokens.
        ($span:expr=> $($tt:tt)*) => {{
            let mut _s = $crate::__private::TokenStream::new();
            let _span: $crate::__private::Span = $crate::__private::get_span($span).__into_span();
            $crate::quote_each_token_spanned!{_s _span $($tt)*}
            _s
        }};
    }
];

// Extract the names of all #metavariables and pass them to the $call macro.
//
// in:   pounded_var_names!(then!(...) a #b c #( #d )* #e)
// out:  then!(... b);
//       then!(... d);
//       then!(... e);
#[macro_export]
#[doc(hidden)]
macro_rules! pounded_var_names {
    ($call:ident! $extra:tt $($tts:tt)*) => {
        $crate::pounded_var_names_with_context!{$call! $extra
            (@ $($tts)*)
            ($($tts)* @)
        }
    };
}

#[macro_export]
#[doc(hidden)]
macro_rules! pounded_var_names_with_context {
    ($call:ident! $extra:tt ($($b1:tt)*) ($($curr:tt)*)) => {
        $(
            $crate::pounded_var_with_context!{$call! $extra $b1 $curr}
        )*
    };
}

#[macro_export]
#[doc(hidden)]
macro_rules! pounded_var_with_context {
    ($call:ident! $extra:tt $b1:tt ( $($inner:tt)* )) => {
        $crate::pounded_var_names!{$call! $extra $($inner)*}
    };

    ($call:ident! $extra:tt $b1:tt [ $($inner:tt)* ]) => {
        $crate::pounded_var_names!{$call! $extra $($inner)*}
    };

    ($call:ident! $extra:tt $b1:tt { $($inner:tt)* }) => {
        $crate::pounded_var_names!{$call! $extra $($inner)*}
    };

    ($call:ident!($($extra:tt)*) # $var:ident) => {
        $crate::$call!($($extra)* $var);
    };

    ($call:ident! $extra:tt $b1:tt $curr:tt) => {};
}

#[macro_export]
#[doc(hidden)]
macro_rules! quote_bind_into_iter {
    ($has_iter:ident $var:ident) => {
        // `mut` may be unused if $var occurs multiple times in the list.
        #[allow(unused_mut)]
        let (mut $var, i) = $var.quote_into_iter();
        let $has_iter = $has_iter | i;
    };
}

#[macro_export]
#[doc(hidden)]
macro_rules! quote_bind_next_or_break {
    ($var:ident) => {
        let $var = match $var.next() {
            Some(_x) => $crate::__private::RepInterp(_x),
            None => break,
        };
    };
}

// The obvious way to write this macro is as a tt muncher. This implementation
// does something more complex for two reasons.
//
//   - With a tt muncher it's easy to hit Rust's built-in recursion_limit, which
//     this implementation avoids because it isn't tail recursive.
//
//   - Compile times for a tt muncher are quadratic relative to the length of
//     the input. This implementation is linear, so it will be faster
//     (potentially much faster) for big inputs. However, the constant factors
//     of this implementation are higher than that of a tt muncher, so it is
//     somewhat slower than a tt muncher if there are many invocations with
//     short inputs.
//
// An invocation like this:
//
//     quote_each_token!(_s a b c d e f g h i j);
//
// expands to this:
//
//     quote_tokens_with_context!(_s
//         (@  @  @  @   @   @   a   b   c   d   e   f   g  h  i  j)
//         (@  @  @  @   @   a   b   c   d   e   f   g   h  i  j  @)
//         (@  @  @  @   a   b   c   d   e   f   g   h   i  j  @  @)
//         (@  @  @ (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) @  @  @)
//         (@  @  a  b   c   d   e   f   g   h   i   j   @  @  @  @)
//         (@  a  b  c   d   e   f   g   h   i   j   @   @  @  @  @)
//         (a  b  c  d   e   f   g   h   i   j   @   @   @  @  @  @)
//     );
//
// which gets transposed and expanded to this:
//
//     quote_token_with_context!(_s @ @ @  @  @ @ a);
//     quote_token_with_context!(_s @ @ @  @  @ a b);
//     quote_token_with_context!(_s @ @ @  @  a b c);
//     quote_token_with_context!(_s @ @ @ (a) b c d);
//     quote_token_with_context!(_s @ @ a (b) c d e);
//     quote_token_with_context!(_s @ a b (c) d e f);
//     quote_token_with_context!(_s a b c (d) e f g);
//     quote_token_with_context!(_s b c d (e) f g h);
//     quote_token_with_context!(_s c d e (f) g h i);
//     quote_token_with_context!(_s d e f (g) h i j);
//     quote_token_with_context!(_s e f g (h) i j @);
//     quote_token_with_context!(_s f g h (i) j @ @);
//     quote_token_with_context!(_s g h i (j) @ @ @);
//     quote_token_with_context!(_s h i j  @  @ @ @);
//     quote_token_with_context!(_s i j @  @  @ @ @);
//     quote_token_with_context!(_s j @ @  @  @ @ @);
//
// Without having used muncher-style recursion, we get one invocation of
// quote_token_with_context for each original tt, with three tts of context on
// either side. This is enough for the longest possible interpolation form (a
// repetition with separator, as in `# (#var) , *`) to be fully represented with
// the first or last tt in the middle.
//
// The middle tt (surrounded by parentheses) is the tt being processed.
//
//   - When it is a `#`, quote_token_with_context can do an interpolation. The
//     interpolation kind will depend on the three subsequent tts.
//
//   - When it is within a later part of an interpolation, it can be ignored
//     because the interpolation has already been done.
//
//   - When it is not part of an interpolation it can be pushed as a single
//     token into the output.
//
//   - When the middle token is an unparenthesized `@`, that call is one of the
//     first 3 or last 3 calls of quote_token_with_context and does not
//     correspond to one of the original input tokens, so turns into nothing.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_each_token {
    ($tokens:ident $($tts:tt)*) => {
        $crate::quote_tokens_with_context!{$tokens
            (@ @ @ @ @ @ $($tts)*)
            (@ @ @ @ @ $($tts)* @)
            (@ @ @ @ $($tts)* @ @)
            (@ @ @ $(($tts))* @ @ @)
            (@ @ $($tts)* @ @ @ @)
            (@ $($tts)* @ @ @ @ @)
            ($($tts)* @ @ @ @ @ @)
        }
    };
}

// See the explanation on quote_each_token.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_each_token_spanned {
    ($tokens:ident $span:ident $($tts:tt)*) => {
        $crate::quote_tokens_with_context_spanned!{$tokens $span
            (@ @ @ @ @ @ $($tts)*)
            (@ @ @ @ @ $($tts)* @)
            (@ @ @ @ $($tts)* @ @)
            (@ @ @ $(($tts))* @ @ @)
            (@ @ $($tts)* @ @ @ @)
            (@ $($tts)* @ @ @ @ @)
            ($($tts)* @ @ @ @ @ @)
        }
    };
}

// See the explanation on quote_each_token.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_tokens_with_context {
    ($tokens:ident
        ($($b3:tt)*) ($($b2:tt)*) ($($b1:tt)*)
        ($($curr:tt)*)
        ($($a1:tt)*) ($($a2:tt)*) ($($a3:tt)*)
    ) => {
        $(
            $crate::quote_token_with_context!{$tokens $b3 $b2 $b1 $curr $a1 $a2 $a3}
        )*
    };
}

// See the explanation on quote_each_token.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_tokens_with_context_spanned {
    ($tokens:ident $span:ident
        ($($b3:tt)*) ($($b2:tt)*) ($($b1:tt)*)
        ($($curr:tt)*)
        ($($a1:tt)*) ($($a2:tt)*) ($($a3:tt)*)
    ) => {
        $(
            $crate::quote_token_with_context_spanned!{$tokens $span $b3 $b2 $b1 $curr $a1 $a2 $a3}
        )*
    };
}

// See the explanation on quote_each_token.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_token_with_context {
    // Unparenthesized `@` indicates this call does not correspond to one of the
    // original input tokens. Ignore it.
    ($tokens:ident $b3:tt $b2:tt $b1:tt @ $a1:tt $a2:tt $a3:tt) => {};

    // A repetition with no separator.
    ($tokens:ident $b3:tt $b2:tt $b1:tt (#) ( $($inner:tt)* ) * $a3:tt) => {{
        use $crate::__private::ext::*;
        let has_iter = $crate::__private::ThereIsNoIteratorInRepetition;
        $crate::pounded_var_names!{quote_bind_into_iter!(has_iter) () $($inner)*}
        let _: $crate::__private::HasIterator = has_iter;
        // This is `while true` instead of `loop` because if there are no
        // iterators used inside of this repetition then the body would not
        // contain any `break`, so the compiler would emit unreachable code
        // warnings on anything below the loop. We use has_iter to detect and
        // fail to compile when there are no iterators, so here we just work
        // around the unneeded extra warning.
        while true {
            $crate::pounded_var_names!{quote_bind_next_or_break!() () $($inner)*}
            $crate::quote_each_token!{$tokens $($inner)*}
        }
    }};
    // ... and one step later.
    ($tokens:ident $b3:tt $b2:tt # (( $($inner:tt)* )) * $a2:tt $a3:tt) => {};
    // ... and one step later.
    ($tokens:ident $b3:tt # ( $($inner:tt)* ) (*) $a1:tt $a2:tt $a3:tt) => {};

    // A repetition with separator.
    ($tokens:ident $b3:tt $b2:tt $b1:tt (#) ( $($inner:tt)* ) $sep:tt *) => {{
        use $crate::__private::ext::*;
        let mut _i = 0usize;
        let has_iter = $crate::__private::ThereIsNoIteratorInRepetition;
        $crate::pounded_var_names!{quote_bind_into_iter!(has_iter) () $($inner)*}
        let _: $crate::__private::HasIterator = has_iter;
        while true {
            $crate::pounded_var_names!{quote_bind_next_or_break!() () $($inner)*}
            if _i > 0 {
                $crate::quote_token!{$sep $tokens}
            }
            _i += 1;
            $crate::quote_each_token!{$tokens $($inner)*}
        }
    }};
    // ... and one step later.
    ($tokens:ident $b3:tt $b2:tt # (( $($inner:tt)* )) $sep:tt * $a3:tt) => {};
    // ... and one step later.
    ($tokens:ident $b3:tt # ( $($inner:tt)* ) ($sep:tt) * $a2:tt $a3:tt) => {};
    // (A special case for `#(var)**`, where the first `*` is treated as the
    // repetition symbol and the second `*` is treated as an ordinary token.)
    ($tokens:ident # ( $($inner:tt)* ) * (*) $a1:tt $a2:tt $a3:tt) => {
        // https://github.com/dtolnay/quote/issues/130
        $crate::quote_token!{* $tokens}
    };
    // ... and one step later.
    ($tokens:ident # ( $($inner:tt)* ) $sep:tt (*) $a1:tt $a2:tt $a3:tt) => {};

    // A non-repetition interpolation.
    ($tokens:ident $b3:tt $b2:tt $b1:tt (#) $var:ident $a2:tt $a3:tt) => {
        $crate::ToTokens::to_tokens(&$var, &mut $tokens);
    };
    // ... and one step later.
    ($tokens:ident $b3:tt $b2:tt # ($var:ident) $a1:tt $a2:tt $a3:tt) => {};

    // An ordinary token, not part of any interpolation.
    ($tokens:ident $b3:tt $b2:tt $b1:tt ($curr:tt) $a1:tt $a2:tt $a3:tt) => {
        $crate::quote_token!{$curr $tokens}
    };
}

// See the explanation on quote_each_token, and on the individual rules of
// quote_token_with_context.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_token_with_context_spanned {
    ($tokens:ident $span:ident $b3:tt $b2:tt $b1:tt @ $a1:tt $a2:tt $a3:tt) => {};

    ($tokens:ident $span:ident $b3:tt $b2:tt $b1:tt (#) ( $($inner:tt)* ) * $a3:tt) => {{
        use $crate::__private::ext::*;
        let has_iter = $crate::__private::ThereIsNoIteratorInRepetition;
        $crate::pounded_var_names!{quote_bind_into_iter!(has_iter) () $($inner)*}
        let _: $crate::__private::HasIterator = has_iter;
        while true {
            $crate::pounded_var_names!{quote_bind_next_or_break!() () $($inner)*}
            $crate::quote_each_token_spanned!{$tokens $span $($inner)*}
        }
    }};
    ($tokens:ident $span:ident $b3:tt $b2:tt # (( $($inner:tt)* )) * $a2:tt $a3:tt) => {};
    ($tokens:ident $span:ident $b3:tt # ( $($inner:tt)* ) (*) $a1:tt $a2:tt $a3:tt) => {};

    ($tokens:ident $span:ident $b3:tt $b2:tt $b1:tt (#) ( $($inner:tt)* ) $sep:tt *) => {{
        use $crate::__private::ext::*;
        let mut _i = 0usize;
        let has_iter = $crate::__private::ThereIsNoIteratorInRepetition;
        $crate::pounded_var_names!{quote_bind_into_iter!(has_iter) () $($inner)*}
        let _: $crate::__private::HasIterator = has_iter;
        while true {
            $crate::pounded_var_names!{quote_bind_next_or_break!() () $($inner)*}
            if _i > 0 {
                $crate::quote_token_spanned!{$sep $tokens $span}
            }
            _i += 1;
            $crate::quote_each_token_spanned!{$tokens $span $($inner)*}
        }
    }};
    ($tokens:ident $span:ident $b3:tt $b2:tt # (( $($inner:tt)* )) $sep:tt * $a3:tt) => {};
    ($tokens:ident $span:ident $b3:tt # ( $($inner:tt)* ) ($sep:tt) * $a2:tt $a3:tt) => {};
    ($tokens:ident $span:ident # ( $($inner:tt)* ) * (*) $a1:tt $a2:tt $a3:tt) => {
        // https://github.com/dtolnay/quote/issues/130
        $crate::quote_token_spanned!{* $tokens $span}
    };
    ($tokens:ident $span:ident # ( $($inner:tt)* ) $sep:tt (*) $a1:tt $a2:tt $a3:tt) => {};

    ($tokens:ident $span:ident $b3:tt $b2:tt $b1:tt (#) $var:ident $a2:tt $a3:tt) => {
        $crate::ToTokens::to_tokens(&$var, &mut $tokens);
    };
    ($tokens:ident $span:ident $b3:tt $b2:tt # ($var:ident) $a1:tt $a2:tt $a3:tt) => {};

    ($tokens:ident $span:ident $b3:tt $b2:tt $b1:tt ($curr:tt) $a1:tt $a2:tt $a3:tt) => {
        $crate::quote_token_spanned!{$curr $tokens $span}
    };
}

// These rules are ordered by approximate token frequency, at least for the
// first 10 or so, to improve compile times. Having `ident` first is by far the
// most important because it's typically 2-3x more common than the next most
// common token.
//
// Separately, we put the token being matched in the very front so that failing
// rules may fail to match as quickly as possible.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_token {
    ($ident:ident $tokens:ident) => {
        $crate::__private::push_ident(&mut $tokens, stringify!($ident));
    };

    (:: $tokens:ident) => {
        $crate::__private::push_colon2(&mut $tokens);
    };

    (( $($inner:tt)* ) $tokens:ident) => {
        $crate::__private::push_group(
            &mut $tokens,
            $crate::__private::Delimiter::Parenthesis,
            $crate::quote!($($inner)*),
        );
    };

    ([ $($inner:tt)* ] $tokens:ident) => {
        $crate::__private::push_group(
            &mut $tokens,
            $crate::__private::Delimiter::Bracket,
            $crate::quote!($($inner)*),
        );
    };

    ({ $($inner:tt)* } $tokens:ident) => {
        $crate::__private::push_group(
            &mut $tokens,
            $crate::__private::Delimiter::Brace,
            $crate::quote!($($inner)*),
        );
    };

    (# $tokens:ident) => {
        $crate::__private::push_pound(&mut $tokens);
    };

    (, $tokens:ident) => {
        $crate::__private::push_comma(&mut $tokens);
    };

    (. $tokens:ident) => {
        $crate::__private::push_dot(&mut $tokens);
    };

    (; $tokens:ident) => {
        $crate::__private::push_semi(&mut $tokens);
    };

    (: $tokens:ident) => {
        $crate::__private::push_colon(&mut $tokens);
    };

    (+ $tokens:ident) => {
        $crate::__private::push_add(&mut $tokens);
    };

    (+= $tokens:ident) => {
        $crate::__private::push_add_eq(&mut $tokens);
    };

    (& $tokens:ident) => {
        $crate::__private::push_and(&mut $tokens);
    };

    (&& $tokens:ident) => {
        $crate::__private::push_and_and(&mut $tokens);
    };

    (&= $tokens:ident) => {
        $crate::__private::push_and_eq(&mut $tokens);
    };

    (@ $tokens:ident) => {
        $crate::__private::push_at(&mut $tokens);
    };

    (! $tokens:ident) => {
        $crate::__private::push_bang(&mut $tokens);
    };

    (^ $tokens:ident) => {
        $crate::__private::push_caret(&mut $tokens);
    };

    (^= $tokens:ident) => {
        $crate::__private::push_caret_eq(&mut $tokens);
    };

    (/ $tokens:ident) => {
        $crate::__private::push_div(&mut $tokens);
    };

    (/= $tokens:ident) => {
        $crate::__private::push_div_eq(&mut $tokens);
    };

    (.. $tokens:ident) => {
        $crate::__private::push_dot2(&mut $tokens);
    };

    (... $tokens:ident) => {
        $crate::__private::push_dot3(&mut $tokens);
    };

    (..= $tokens:ident) => {
        $crate::__private::push_dot_dot_eq(&mut $tokens);
    };

    (= $tokens:ident) => {
        $crate::__private::push_eq(&mut $tokens);
    };

    (== $tokens:ident) => {
        $crate::__private::push_eq_eq(&mut $tokens);
    };

    (>= $tokens:ident) => {
        $crate::__private::push_ge(&mut $tokens);
    };

    (> $tokens:ident) => {
        $crate::__private::push_gt(&mut $tokens);
    };

    (<= $tokens:ident) => {
        $crate::__private::push_le(&mut $tokens);
    };

    (< $tokens:ident) => {
        $crate::__private::push_lt(&mut $tokens);
    };

    (*= $tokens:ident) => {
        $crate::__private::push_mul_eq(&mut $tokens);
    };

    (!= $tokens:ident) => {
        $crate::__private::push_ne(&mut $tokens);
    };

    (| $tokens:ident) => {
        $crate::__private::push_or(&mut $tokens);
    };

    (|= $tokens:ident) => {
        $crate::__private::push_or_eq(&mut $tokens);
    };

    (|| $tokens:ident) => {
        $crate::__private::push_or_or(&mut $tokens);
    };

    (? $tokens:ident) => {
        $crate::__private::push_question(&mut $tokens);
    };

    (-> $tokens:ident) => {
        $crate::__private::push_rarrow(&mut $tokens);
    };

    (<- $tokens:ident) => {
        $crate::__private::push_larrow(&mut $tokens);
    };

    (% $tokens:ident) => {
        $crate::__private::push_rem(&mut $tokens);
    };

    (%= $tokens:ident) => {
        $crate::__private::push_rem_eq(&mut $tokens);
    };

    (=> $tokens:ident) => {
        $crate::__private::push_fat_arrow(&mut $tokens);
    };

    (<< $tokens:ident) => {
        $crate::__private::push_shl(&mut $tokens);
    };

    (<<= $tokens:ident) => {
        $crate::__private::push_shl_eq(&mut $tokens);
    };

    (>> $tokens:ident) => {
        $crate::__private::push_shr(&mut $tokens);
    };

    (>>= $tokens:ident) => {
        $crate::__private::push_shr_eq(&mut $tokens);
    };

    (* $tokens:ident) => {
        $crate::__private::push_star(&mut $tokens);
    };

    (- $tokens:ident) => {
        $crate::__private::push_sub(&mut $tokens);
    };

    (-= $tokens:ident) => {
        $crate::__private::push_sub_eq(&mut $tokens);
    };

    ($lifetime:lifetime $tokens:ident) => {
        $crate::__private::push_lifetime(&mut $tokens, stringify!($lifetime));
    };

    (_ $tokens:ident) => {
        $crate::__private::push_underscore(&mut $tokens);
    };

    ($other:tt $tokens:ident) => {
        $crate::__private::parse(&mut $tokens, stringify!($other));
    };
}

// See the comment above `quote_token!` about the rule ordering.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_token_spanned {
    ($ident:ident $tokens:ident $span:ident) => {
        $crate::__private::push_ident_spanned(&mut $tokens, $span, stringify!($ident));
    };

    (:: $tokens:ident $span:ident) => {
        $crate::__private::push_colon2_spanned(&mut $tokens, $span);
    };

    (( $($inner:tt)* ) $tokens:ident $span:ident) => {
        $crate::__private::push_group_spanned(
            &mut $tokens,
            $span,
            $crate::__private::Delimiter::Parenthesis,
            $crate::quote_spanned!($span=> $($inner)*),
        );
    };

    ([ $($inner:tt)* ] $tokens:ident $span:ident) => {
        $crate::__private::push_group_spanned(
            &mut $tokens,
            $span,
            $crate::__private::Delimiter::Bracket,
            $crate::quote_spanned!($span=> $($inner)*),
        );
    };

    ({ $($inner:tt)* } $tokens:ident $span:ident) => {
        $crate::__private::push_group_spanned(
            &mut $tokens,
            $span,
            $crate::__private::Delimiter::Brace,
            $crate::quote_spanned!($span=> $($inner)*),
        );
    };

    (# $tokens:ident $span:ident) => {
        $crate::__private::push_pound_spanned(&mut $tokens, $span);
    };

    (, $tokens:ident $span:ident) => {
        $crate::__private::push_comma_spanned(&mut $tokens, $span);
    };

    (. $tokens:ident $span:ident) => {
        $crate::__private::push_dot_spanned(&mut $tokens, $span);
    };

    (; $tokens:ident $span:ident) => {
        $crate::__private::push_semi_spanned(&mut $tokens, $span);
    };

    (: $tokens:ident $span:ident) => {
        $crate::__private::push_colon_spanned(&mut $tokens, $span);
    };

    (+ $tokens:ident $span:ident) => {
        $crate::__private::push_add_spanned(&mut $tokens, $span);
    };

    (+= $tokens:ident $span:ident) => {
        $crate::__private::push_add_eq_spanned(&mut $tokens, $span);
    };

    (& $tokens:ident $span:ident) => {
        $crate::__private::push_and_spanned(&mut $tokens, $span);
    };

    (&& $tokens:ident $span:ident) => {
        $crate::__private::push_and_and_spanned(&mut $tokens, $span);
    };

    (&= $tokens:ident $span:ident) => {
        $crate::__private::push_and_eq_spanned(&mut $tokens, $span);
    };

    (@ $tokens:ident $span:ident) => {
        $crate::__private::push_at_spanned(&mut $tokens, $span);
    };

    (! $tokens:ident $span:ident) => {
        $crate::__private::push_bang_spanned(&mut $tokens, $span);
    };

    (^ $tokens:ident $span:ident) => {
        $crate::__private::push_caret_spanned(&mut $tokens, $span);
    };

    (^= $tokens:ident $span:ident) => {
        $crate::__private::push_caret_eq_spanned(&mut $tokens, $span);
    };

    (/ $tokens:ident $span:ident) => {
        $crate::__private::push_div_spanned(&mut $tokens, $span);
    };

    (/= $tokens:ident $span:ident) => {
        $crate::__private::push_div_eq_spanned(&mut $tokens, $span);
    };

    (.. $tokens:ident $span:ident) => {
        $crate::__private::push_dot2_spanned(&mut $tokens, $span);
    };

    (... $tokens:ident $span:ident) => {
        $crate::__private::push_dot3_spanned(&mut $tokens, $span);
    };

    (..= $tokens:ident $span:ident) => {
        $crate::__private::push_dot_dot_eq_spanned(&mut $tokens, $span);
    };

    (= $tokens:ident $span:ident) => {
        $crate::__private::push_eq_spanned(&mut $tokens, $span);
    };

    (== $tokens:ident $span:ident) => {
        $crate::__private::push_eq_eq_spanned(&mut $tokens, $span);
    };

    (>= $tokens:ident $span:ident) => {
        $crate::__private::push_ge_spanned(&mut $tokens, $span);
    };

    (> $tokens:ident $span:ident) => {
        $crate::__private::push_gt_spanned(&mut $tokens, $span);
    };

    (<= $tokens:ident $span:ident) => {
        $crate::__private::push_le_spanned(&mut $tokens, $span);
    };

    (< $tokens:ident $span:ident) => {
        $crate::__private::push_lt_spanned(&mut $tokens, $span);
    };

    (*= $tokens:ident $span:ident) => {
        $crate::__private::push_mul_eq_spanned(&mut $tokens, $span);
    };

    (!= $tokens:ident $span:ident) => {
        $crate::__private::push_ne_spanned(&mut $tokens, $span);
    };

    (| $tokens:ident $span:ident) => {
        $crate::__private::push_or_spanned(&mut $tokens, $span);
    };

    (|= $tokens:ident $span:ident) => {
        $crate::__private::push_or_eq_spanned(&mut $tokens, $span);
    };

    (|| $tokens:ident $span:ident) => {
        $crate::__private::push_or_or_spanned(&mut $tokens, $span);
    };

    (? $tokens:ident $span:ident) => {
        $crate::__private::push_question_spanned(&mut $tokens, $span);
    };

    (-> $tokens:ident $span:ident) => {
        $crate::__private::push_rarrow_spanned(&mut $tokens, $span);
    };

    (<- $tokens:ident $span:ident) => {
        $crate::__private::push_larrow_spanned(&mut $tokens, $span);
    };

    (% $tokens:ident $span:ident) => {
        $crate::__private::push_rem_spanned(&mut $tokens, $span);
    };

    (%= $tokens:ident $span:ident) => {
        $crate::__private::push_rem_eq_spanned(&mut $tokens, $span);
    };

    (=> $tokens:ident $span:ident) => {
        $crate::__private::push_fat_arrow_spanned(&mut $tokens, $span);
    };

    (<< $tokens:ident $span:ident) => {
        $crate::__private::push_shl_spanned(&mut $tokens, $span);
    };

    (<<= $tokens:ident $span:ident) => {
        $crate::__private::push_shl_eq_spanned(&mut $tokens, $span);
    };

    (>> $tokens:ident $span:ident) => {
        $crate::__private::push_shr_spanned(&mut $tokens, $span);
    };

    (>>= $tokens:ident $span:ident) => {
        $crate::__private::push_shr_eq_spanned(&mut $tokens, $span);
    };

    (* $tokens:ident $span:ident) => {
        $crate::__private::push_star_spanned(&mut $tokens, $span);
    };

    (- $tokens:ident $span:ident) => {
        $crate::__private::push_sub_spanned(&mut $tokens, $span);
    };

    (-= $tokens:ident $span:ident) => {
        $crate::__private::push_sub_eq_spanned(&mut $tokens, $span);
    };

    ($lifetime:lifetime $tokens:ident $span:ident) => {
        $crate::__private::push_lifetime_spanned(&mut $tokens, $span, stringify!($lifetime));
    };

    (_ $tokens:ident $span:ident) => {
        $crate::__private::push_underscore_spanned(&mut $tokens, $span);
    };

    ($other:tt $tokens:ident $span:ident) => {
        $crate::__private::parse_spanned(&mut $tokens, $span, stringify!($other));
    };
}