1 use crate::Error;
2 use alloc::string::String;
3 use core::fmt::{self, Debug, Write};
4 use core::mem::MaybeUninit;
5 use core::ptr;
6 use core::slice;
7 use core::str;
8
9 #[doc(hidden)]
10 pub trait BothDebug {
__dispatch_ensure(self, msg: &'static str) -> Error11 fn __dispatch_ensure(self, msg: &'static str) -> Error;
12 }
13
14 impl<A, B> BothDebug for (A, B)
15 where
16 A: Debug,
17 B: Debug,
18 {
__dispatch_ensure(self, msg: &'static str) -> Error19 fn __dispatch_ensure(self, msg: &'static str) -> Error {
20 render(msg, &self.0, &self.1)
21 }
22 }
23
24 #[doc(hidden)]
25 pub trait NotBothDebug {
__dispatch_ensure(self, msg: &'static str) -> Error26 fn __dispatch_ensure(self, msg: &'static str) -> Error;
27 }
28
29 impl<A, B> NotBothDebug for &(A, B) {
__dispatch_ensure(self, msg: &'static str) -> Error30 fn __dispatch_ensure(self, msg: &'static str) -> Error {
31 Error::msg(msg)
32 }
33 }
34
35 struct Buf {
36 bytes: [MaybeUninit<u8>; 40],
37 written: usize,
38 }
39
40 impl Buf {
new() -> Self41 fn new() -> Self {
42 Buf {
43 bytes: [MaybeUninit::uninit(); 40],
44 written: 0,
45 }
46 }
47
as_str(&self) -> &str48 fn as_str(&self) -> &str {
49 unsafe {
50 str::from_utf8_unchecked(slice::from_raw_parts(
51 self.bytes.as_ptr().cast::<u8>(),
52 self.written,
53 ))
54 }
55 }
56 }
57
58 impl Write for Buf {
write_str(&mut self, s: &str) -> fmt::Result59 fn write_str(&mut self, s: &str) -> fmt::Result {
60 if s.bytes().any(|b| b == b' ' || b == b'\n') {
61 return Err(fmt::Error);
62 }
63
64 let remaining = self.bytes.len() - self.written;
65 if s.len() > remaining {
66 return Err(fmt::Error);
67 }
68
69 unsafe {
70 ptr::copy_nonoverlapping(
71 s.as_ptr(),
72 self.bytes.as_mut_ptr().add(self.written).cast::<u8>(),
73 s.len(),
74 );
75 }
76 self.written += s.len();
77 Ok(())
78 }
79 }
80
render(msg: &'static str, lhs: &dyn Debug, rhs: &dyn Debug) -> Error81 fn render(msg: &'static str, lhs: &dyn Debug, rhs: &dyn Debug) -> Error {
82 let mut lhs_buf = Buf::new();
83 if fmt::write(&mut lhs_buf, format_args!("{:?}", lhs)).is_ok() {
84 let mut rhs_buf = Buf::new();
85 if fmt::write(&mut rhs_buf, format_args!("{:?}", rhs)).is_ok() {
86 let lhs_str = lhs_buf.as_str();
87 let rhs_str = rhs_buf.as_str();
88 // "{msg} ({lhs} vs {rhs})"
89 let len = msg.len() + 2 + lhs_str.len() + 4 + rhs_str.len() + 1;
90 let mut string = String::with_capacity(len);
91 string.push_str(msg);
92 string.push_str(" (");
93 string.push_str(lhs_str);
94 string.push_str(" vs ");
95 string.push_str(rhs_str);
96 string.push(')');
97 return Error::msg(string);
98 }
99 }
100 Error::msg(msg)
101 }
102
103 #[doc(hidden)]
104 #[macro_export]
105 macro_rules! __parse_ensure {
106 (atom () $bail:tt $fuel:tt {($($rhs:tt)+) ($($lhs:tt)+) $op:tt} $dup:tt $(,)?) => {
107 $crate::__fancy_ensure!($($lhs)+, $op, $($rhs)+)
108 };
109
110 // low precedence control flow constructs
111
112 (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt return $($rest:tt)*) => {
113 $crate::__fallback_ensure!($($bail)*)
114 };
115
116 (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt break $($rest:tt)*) => {
117 $crate::__fallback_ensure!($($bail)*)
118 };
119
120 (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt continue $($rest:tt)*) => {
121 $crate::__fallback_ensure!($($bail)*)
122 };
123
124 (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt yield $($rest:tt)*) => {
125 $crate::__fallback_ensure!($($bail)*)
126 };
127
128 (0 $stack:tt ($($bail:tt)*) $fuel:tt $parse:tt $dup:tt move $($rest:tt)*) => {
129 $crate::__fallback_ensure!($($bail)*)
130 };
131
132 // unary operators
133
134 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($deref:tt $($dup:tt)*) * $($rest:tt)*) => {
135 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $deref) $($parse)*} ($($rest)*) $($rest)*)
136 };
137
138 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($not:tt $($dup:tt)*) ! $($rest:tt)*) => {
139 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $not) $($parse)*} ($($rest)*) $($rest)*)
140 };
141
142 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($neg:tt $($dup:tt)*) - $($rest:tt)*) => {
143 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $neg) $($parse)*} ($($rest)*) $($rest)*)
144 };
145
146 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($let:tt $($dup:tt)*) let $($rest:tt)*) => {
147 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $let) $($parse)*} ($($rest)*) $($rest)*)
148 };
149
150 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($life:tt $colon:tt $($dup:tt)*) $label:lifetime : $($rest:tt)*) => {
151 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $life $colon) $($parse)*} ($($rest)*) $($rest)*)
152 };
153
154 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $mut:tt $($dup:tt)*) &mut $($rest:tt)*) => {
155 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $and $mut) $($parse)*} ($($rest)*) $($rest)*)
156 };
157
158 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) & $($rest:tt)*) => {
159 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*)
160 };
161
162 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($andand:tt $mut:tt $($dup:tt)*) &&mut $($rest:tt)*) => {
163 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $andand $mut) $($parse)*} ($($rest)*) $($rest)*)
164 };
165
166 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($andand:tt $($dup:tt)*) && $($rest:tt)*) => {
167 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $andand) $($parse)*} ($($rest)*) $($rest)*)
168 };
169
170 // control flow constructs
171
172 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($if:tt $($dup:tt)*) if $($rest:tt)*) => {
173 $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $if) $($parse)*} ($($rest)*) $($rest)*)
174 };
175
176 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($match:tt $($dup:tt)*) match $($rest:tt)*) => {
177 $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $match) $($parse)*} ($($rest)*) $($rest)*)
178 };
179
180 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($while:tt $($dup:tt)*) while $($rest:tt)*) => {
181 $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $while) $($parse)*} ($($rest)*) $($rest)*)
182 };
183
184 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($for:tt $($dup:tt)*) for $($rest:tt)*) => {
185 $crate::__parse_ensure!(pat (cond $stack) $bail ($($fuel)*) {($($buf)* $for) $($parse)*} ($($rest)*) $($rest)*)
186 };
187
188 (atom (cond $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($block:tt)*} $($rest:tt)*) => {
189 $crate::__parse_ensure!(cond $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*)
190 };
191
192 (cond $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($else:tt $if:tt $($dup:tt)*) else if $($rest:tt)*) => {
193 $crate::__parse_ensure!(0 (cond $stack) $bail ($($fuel)*) {($($buf)* $else $if) $($parse)*} ($($rest)*) $($rest)*)
194 };
195
196 (cond $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($else:tt $brace:tt $($dup:tt)*) else {$($block:tt)*} $($rest:tt)*) => {
197 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $else $brace) $($parse)*} ($($rest)*) $($rest)*)
198 };
199
200 (cond $stack:tt $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => {
201 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) $parse $dup $($rest)*)
202 };
203
204 // atomic expressions
205
206 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($content:tt)*) $($rest:tt)*) => {
207 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*)
208 };
209
210 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($array:tt)*] $($rest:tt)*) => {
211 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*)
212 };
213
214 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($block:tt)*} $($rest:tt)*) => {
215 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*)
216 };
217
218 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($loop:tt $block:tt $($dup:tt)*) loop {$($body:tt)*} $($rest:tt)*) => {
219 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $loop $block) $($parse)*} ($($rest)*) $($rest)*)
220 };
221
222 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($async:tt $block:tt $($dup:tt)*) async {$($body:tt)*} $($rest:tt)*) => {
223 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $async $block) $($parse)*} ($($rest)*) $($rest)*)
224 };
225
226 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($async:tt $move:tt $block:tt $($dup:tt)*) async move {$($body:tt)*} $($rest:tt)*) => {
227 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $async $move $block) $($parse)*} ($($rest)*) $($rest)*)
228 };
229
230 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($unsafe:tt $block:tt $($dup:tt)*) unsafe {$($body:tt)*} $($rest:tt)*) => {
231 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $unsafe $block) $($parse)*} ($($rest)*) $($rest)*)
232 };
233
234 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($const:tt $block:tt $($dup:tt)*) const {$($body:tt)*} $($rest:tt)*) => {
235 // TODO: this is mostly useless due to https://github.com/rust-lang/rust/issues/86730
236 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $const $block) $($parse)*} ($($rest)*) $($rest)*)
237 };
238
239 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $lit:literal $($rest:tt)*) => {
240 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $lit) $($parse)*} ($($rest)*) $($rest)*)
241 };
242
243 // path expressions
244
245 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => {
246 $crate::__parse_ensure!(epath (atom $stack) $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*)
247 };
248
249 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $ident:ident $($rest:tt)*) => {
250 $crate::__parse_ensure!(epath (atom $stack) $bail ($($fuel)*) {($($buf)* $ident) $($parse)*} ($($rest)*) $($rest)*)
251 };
252
253 (0 $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => {
254 $crate::__parse_ensure!(type (qpath (epath (atom $stack))) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*)
255 };
256
257 (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $langle:tt $($dup:tt)*) :: < $($rest:tt)*) => {
258 $crate::__parse_ensure!(generic (epath $stack) $bail ($($fuel)*) {($($buf)* $colons $langle) $($parse)*} ($($rest)*) $($rest)*)
259 };
260
261 (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: << $($rest:tt)*) => {
262 $crate::__parse_ensure!(generic (epath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (< $($rest)*) < $($rest)*)
263 };
264
265 (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: <- $($rest:tt)*) => {
266 $crate::__parse_ensure!(generic (epath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (- $($rest)*) - $($rest)*)
267 };
268
269 (epath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => {
270 $crate::__parse_ensure!(epath $stack $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*)
271 };
272
273 (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! ($($mac:tt)*) $($rest:tt)*) => {
274 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*)
275 };
276
277 (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! [$($mac:tt)*] $($rest:tt)*) => {
278 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*)
279 };
280
281 (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! {$($mac:tt)*} $($rest:tt)*) => {
282 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*)
283 };
284
285 (epath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => {
286 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) $parse $dup $($rest)*)
287 };
288
289 // trailer expressions
290
291 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($call:tt)*) $($rest:tt)*) => {
292 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*)
293 };
294
295 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($index:tt)*] $($rest:tt)*) => {
296 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*)
297 };
298
299 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($init:tt)*} $($rest:tt)*) => {
300 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*)
301 };
302
303 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($question:tt $($dup:tt)*) ? $($rest:tt)*) => {
304 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $question) $($parse)*} ($($rest)*) $($rest)*)
305 };
306
307 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $ident:tt $colons:tt $langle:tt $($dup:tt)*) . $i:ident :: < $($rest:tt)*) => {
308 $crate::__parse_ensure!(generic (atom $stack) $bail ($($fuel)*) {($($buf)* $dot $ident $colons $langle) $($parse)*} ($($rest)*) $($rest)*)
309 };
310
311 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $ident:tt $colons:tt $($dup:tt)*) . $i:ident :: << $($rest:tt)*) => {
312 $crate::__parse_ensure!(generic (atom $stack) $bail ($($fuel)*) {($($buf)* $dot $ident $colons <) $($parse)*} (< $($rest)*) < $($rest)*)
313 };
314
315 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $ident:tt $colons:tt $($dup:tt)*) . $i:ident :: <- $($rest:tt)*) => {
316 $crate::__parse_ensure!(generic (atom $stack) $bail ($($fuel)*) {($($buf)* $dot $ident $colons <) $($parse)*} (- $($rest)*) - $($rest)*)
317 };
318
319 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $($dup:tt)*) . $field:ident $($rest:tt)*) => {
320 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $dot $field) $($parse)*} ($($rest)*) $($rest)*)
321 };
322
323 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $index:tt $($dup:tt)*) . $lit:literal $($rest:tt)*) => {
324 $crate::__parse_ensure!(atom $stack $bail ($($fuel)*) {($($buf)* $dot $index) $($parse)*} ($($rest)*) $($rest)*)
325 };
326
327 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($as:tt $($dup:tt)*) as $($rest:tt)*) => {
328 $crate::__parse_ensure!(type (atom $stack) $bail ($($fuel)*) {($($buf)* $as) $($parse)*} ($($rest)*) $($rest)*)
329 };
330
331 // types
332
333 (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($content:tt)*] $($rest:tt)*) => {
334 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*)
335 };
336
337 (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($content:tt)*) $($rest:tt)*) => {
338 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*)
339 };
340
341 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($star:tt $const:tt $($dup:tt)*) *const $($rest:tt)*) => {
342 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $star $const) $($parse)*} ($($rest)*) $($rest)*)
343 };
344
345 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($star:tt $mut:tt $($dup:tt)*) *mut $($rest:tt)*) => {
346 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $star $mut) $($parse)*} ($($rest)*) $($rest)*)
347 };
348
349 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $mut:tt $($dup:tt)*) & $l:lifetime mut $($rest:tt)*) => {
350 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life $mut) $($parse)*} ($($rest)*) $($rest)*)
351 };
352
353 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $mut:tt $($dup:tt)*) & mut $($rest:tt)*) => {
354 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $mut) $($parse)*} ($($rest)*) $($rest)*)
355 };
356
357 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $($dup:tt)*) & $l:lifetime $($rest:tt)*) => {
358 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life) $($parse)*} ($($rest)*) $($rest)*)
359 };
360
361 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) & $($rest:tt)*) => {
362 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*)
363 };
364
365 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $mut:tt $($dup:tt)*) && $l:lifetime mut $($rest:tt)*) => {
366 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life $mut) $($parse)*} ($($rest)*) $($rest)*)
367 };
368
369 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $mut:tt $($dup:tt)*) && mut $($rest:tt)*) => {
370 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $mut) $($parse)*} ($($rest)*) $($rest)*)
371 };
372
373 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $life:lifetime $($dup:tt)*) && $l:lifetime $($rest:tt)*) => {
374 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and $life) $($parse)*} ($($rest)*) $($rest)*)
375 };
376
377 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) && $($rest:tt)*) => {
378 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*)
379 };
380
381 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($unsafe:tt $(extern $($abi:literal)?)? fn $($dup:tt)*) unsafe $($rest:tt)*) => {
382 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $unsafe) $($parse)*} ($($rest)*) $($rest)*)
383 };
384
385 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($extern:tt $abi:literal fn $($dup:tt)*) extern $lit:literal $($rest:tt)*) => {
386 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $extern $abi) $($parse)*} ($($rest)*) $($rest)*)
387 };
388
389 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($extern:tt fn $($dup:tt)*) extern $($rest:tt)*) => {
390 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $extern) $($parse)*} ($($rest)*) $($rest)*)
391 };
392
393 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($fn:tt $paren:tt $arrow:tt $($dup:tt)*) fn ($($args:tt)*) -> $($rest:tt)*) => {
394 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $fn $paren $arrow) $($parse)*} ($($rest)*) $($rest)*)
395 };
396
397 (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($fn:tt $paren:tt $($dup:tt)*) fn ($($args:tt)*) $($rest:tt)*) => {
398 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $fn $paren) $($parse)*} ($($rest)*) $($rest)*)
399 };
400
401 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($impl:tt $($dup:tt)*) impl $($rest:tt)*) => {
402 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $impl) $($parse)*} ($($rest)*) $($rest)*)
403 };
404
405 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dyn:tt $($dup:tt)*) dyn $($rest:tt)*) => {
406 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $dyn) $($parse)*} ($($rest)*) $($rest)*)
407 };
408
409 (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($wild:tt $($dup:tt)*) _ $($rest:tt)*) => {
410 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $wild) $($parse)*} ($($rest)*) $($rest)*)
411 };
412
413 (type ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($never:tt $($dup:tt)*) ! $($rest:tt)*) => {
414 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $never) $($parse)*} ($($rest)*) $($rest)*)
415 };
416
417 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($for:tt $langle:tt $($dup:tt)*) for < $($rest:tt)*) => {
418 $crate::__parse_ensure!(generic (type $stack) $bail ($($fuel)*) {($($buf)* $for $langle) $($parse)*} ($($rest)*) $($rest)*)
419 };
420
421 // path types
422
423 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => {
424 $crate::__parse_ensure!(tpath $stack $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*)
425 };
426
427 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $ident:ident $($rest:tt)*) => {
428 $crate::__parse_ensure!(tpath $stack $bail ($($fuel)*) {($($buf)* $ident) $($parse)*} ($($rest)*) $($rest)*)
429 };
430
431 (type $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => {
432 $crate::__parse_ensure!(type (qpath (tpath $stack)) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*)
433 };
434
435 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => {
436 $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*)
437 };
438
439 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt << $($rest:tt)*) => {
440 $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* <) $($parse)*} (< $($rest)*) < $($rest)*)
441 };
442
443 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt <- $($rest:tt)*) => {
444 $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* <) $($parse)*} (- $($rest)*) - $($rest)*)
445 };
446
447 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $langle:tt $($dup:tt)*) :: < $($rest:tt)*) => {
448 $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $colons $langle) $($parse)*} ($($rest)*) $($rest)*)
449 };
450
451 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: << $($rest:tt)*) => {
452 $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (< $($rest)*) < $($rest)*)
453 };
454
455 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: <- $($rest:tt)*) => {
456 $crate::__parse_ensure!(generic (tpath $stack) $bail ($($fuel)*) {($($buf)* $colons <) $($parse)*} (- $($rest)*) - $($rest)*)
457 };
458
459 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => {
460 $crate::__parse_ensure!(tpath $stack $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*)
461 };
462
463 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $arrow:tt $($dup:tt)*) ($($args:tt)*) -> $($rest:tt)*) => {
464 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $paren $arrow) $($parse)*} ($($rest)*) $($rest)*)
465 };
466
467 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($args:tt)*) $($rest:tt)*) => {
468 $crate::__parse_ensure!(object $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*)
469 };
470
471 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $paren:tt $arrow:tt $($dup:tt)*) :: ($($args:tt)*) -> $($rest:tt)*) => {
472 $crate::__parse_ensure!(type $stack $bail ($($fuel)*) {($($buf)* $colons $paren $arrow) $($parse)*} ($($rest)*) $($rest)*)
473 };
474
475 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $paren:tt $($dup:tt)*) :: ($($args:tt)*) $($rest:tt)*) => {
476 $crate::__parse_ensure!(object $stack $bail ($($fuel)*) {($($buf)* $colons $paren) $($parse)*} ($($rest)*) $($rest)*)
477 };
478
479 (tpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! ($($mac:tt)*) $($rest:tt)*) => {
480 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*)
481 };
482
483 (tpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! [$($mac:tt)*] $($rest:tt)*) => {
484 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*)
485 };
486
487 (tpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bang:tt $args:tt $($dup:tt)*) ! {$($mac:tt)*} $($rest:tt)*) => {
488 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $bang $args) $($parse)*} ($($rest)*) $($rest)*)
489 };
490
491 (tpath $stack:tt $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => {
492 $crate::__parse_ensure!(object $stack $bail ($($fuel)*) $parse $dup $($rest)*)
493 };
494
495 // qualified paths
496
497 (qpath ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rangle:tt $colons:tt $($dup:tt)*) > :: $ident:ident $($rest:tt)*) => {
498 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $rangle $colons $ident) $($parse)*} ($($rest)*) $($rest)*)
499 };
500
501 (qpath $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($as:tt $($dup:tt)*) as $($rest:tt)*) => {
502 $crate::__parse_ensure!(type (qpath $stack) $bail ($($fuel)*) {($($buf)* $as) $($parse)*} ($($rest)*) $($rest)*)
503 };
504
505 // trait objects
506
507 (object (arglist $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($plus:tt $colons:tt $($dup:tt)*) + :: $ident:ident $($rest:tt)*) => {
508 $crate::__parse_ensure!(tpath (arglist $stack) $bail ($($fuel)*) {($($buf)* $plus $colons $ident) $($parse)*} ($($rest)*) $($rest)*)
509 };
510
511 (object (arglist $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($plus:tt $($dup:tt)*) + $ident:ident $($rest:tt)*) => {
512 $crate::__parse_ensure!(tpath (arglist $stack) $bail ($($fuel)*) {($($buf)* $plus $ident) $($parse)*} ($($rest)*) $($rest)*)
513 };
514
515 (object ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => {
516 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) $parse $dup $($rest)*)
517 };
518
519 // angle bracketed generic arguments
520
521 (generic ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rangle:tt $($dup:tt)*) > $($rest:tt)*) => {
522 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $rangle) $($parse)*} ($($rest)*) $($rest)*)
523 };
524
525 (generic ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt >> $($rest:tt)*) => {
526 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* >) $($parse)*} (> $($rest)*) > $($rest)*)
527 };
528
529 (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $lit:literal $($rest:tt)*) => {
530 $crate::__parse_ensure!(arglist $stack $bail ($($fuel)*) {($($buf)* $lit) $($parse)*} ($($rest)*) $($rest)*)
531 };
532
533 (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($block:tt)*} $($rest:tt)*) => {
534 $crate::__parse_ensure!(arglist $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*)
535 };
536
537 (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $life:lifetime $($rest:tt)*) => {
538 $crate::__parse_ensure!(arglist $stack $bail ($($fuel)*) {($($buf)* $life) $($parse)*} ($($rest)*) $($rest)*)
539 };
540
541 (generic $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($assoc:ident $eq:tt $($dup:tt)*) $ident:ident = $($rest:tt)*) => {
542 $crate::__parse_ensure!(type (arglist $stack) $bail ($($fuel)*) {($($buf)* $assoc $eq) $($parse)*} ($($rest)*) $($rest)*)
543 };
544
545 (generic $stack:tt $bail:tt (~$($fuel:tt)*) $parse:tt $dup:tt $($rest:tt)*) => {
546 $crate::__parse_ensure!(type (arglist $stack) $bail ($($fuel)*) $parse $dup $($rest)*)
547 };
548
549 (arglist $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($comma:tt $($dup:tt)*) , $($rest:tt)*) => {
550 $crate::__parse_ensure!(generic $stack $bail ($($fuel)*) {($($buf)* $comma) $($parse)*} ($($rest)*) $($rest)*)
551 };
552
553 (arglist ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rangle:tt $($dup:tt)*) > $($rest:tt)*) => {
554 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* $rangle) $($parse)*} ($($rest)*) $($rest)*)
555 };
556
557 (arglist ($pop:ident $stack:tt) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt >> $($rest:tt)*) => {
558 $crate::__parse_ensure!($pop $stack $bail ($($fuel)*) {($($buf)* >) $($parse)*} (> $($rest)*) > $($rest)*)
559 };
560
561 // patterns
562
563 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($pipe:tt $($dup:tt)*) | $($rest:tt)*) => {
564 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $pipe) $($parse)*} ($($rest)*) $($rest)*)
565 };
566
567 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($eq:tt $($dup:tt)*) = $($rest:tt)*) => {
568 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $eq) $($parse)*} ($($rest)*) $($rest)*)
569 };
570
571 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($in:tt $($dup:tt)*) in $($rest:tt)*) => {
572 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $in) $($parse)*} ($($rest)*) $($rest)*)
573 };
574
575 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($ref:tt $($dup:tt)*) ref $($rest:tt)*) => {
576 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $ref) $($parse)*} ($($rest)*) $($rest)*)
577 };
578
579 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($mut:tt $($dup:tt)*) mut $($rest:tt)*) => {
580 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $mut) $($parse)*} ($($rest)*) $($rest)*)
581 };
582
583 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($at:tt $($dup:tt)*) @ $($rest:tt)*) => {
584 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $at) $($parse)*} ($($rest)*) $($rest)*)
585 };
586
587 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $lit:literal $($rest:tt)*) => {
588 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $lit) $($parse)*} ($($rest)*) $($rest)*)
589 };
590
591 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($range:tt $($dup:tt)*) .. $($rest:tt)*) => {
592 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $range) $($parse)*} ($($rest)*) $($rest)*)
593 };
594
595 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($range:tt $($dup:tt)*) ..= $($rest:tt)*) => {
596 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $range) $($parse)*} ($($rest)*) $($rest)*)
597 };
598
599 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) & $($rest:tt)*) => {
600 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*)
601 };
602
603 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($andand:tt $($dup:tt)*) && $($rest:tt)*) => {
604 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $andand) $($parse)*} ($($rest)*) $($rest)*)
605 };
606
607 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($paren:tt $($dup:tt)*) ($($content:tt)*) $($rest:tt)*) => {
608 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $paren) $($parse)*} ($($rest)*) $($rest)*)
609 };
610
611 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bracket:tt $($dup:tt)*) [$($content:tt)*] $($rest:tt)*) => {
612 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $bracket) $($parse)*} ($($rest)*) $($rest)*)
613 };
614
615 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($brace:tt $($dup:tt)*) {$($content:tt)*} $($rest:tt)*) => {
616 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $brace) $($parse)*} ($($rest)*) $($rest)*)
617 };
618
619 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($wild:tt $($dup:tt)*) _ $($rest:tt)*) => {
620 $crate::__parse_ensure!(pat $stack $bail ($($fuel)*) {($($buf)* $wild) $($parse)*} ($($rest)*) $($rest)*)
621 };
622
623 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($colons:tt $($dup:tt)*) :: $ident:ident $($rest:tt)*) => {
624 $crate::__parse_ensure!(epath (pat $stack) $bail ($($fuel)*) {($($buf)* $colons $ident) $($parse)*} ($($rest)*) $($rest)*)
625 };
626
627 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} $dup:tt $ident:ident $($rest:tt)*) => {
628 $crate::__parse_ensure!(epath (pat $stack) $bail ($($fuel)*) {($($buf)* $ident) $($parse)*} ($($rest)*) $($rest)*)
629 };
630
631 (pat $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($langle:tt $($dup:tt)*) < $($rest:tt)*) => {
632 $crate::__parse_ensure!(type (qpath (epath (pat $stack))) $bail ($($fuel)*) {($($buf)* $langle) $($parse)*} ($($rest)*) $($rest)*)
633 };
634
635 // high precedence binary operators
636
637 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($add:tt $($dup:tt)*) + $($rest:tt)*) => {
638 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $add) $($parse)*} ($($rest)*) $($rest)*)
639 };
640
641 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($sub:tt $($dup:tt)*) - $($rest:tt)*) => {
642 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $sub) $($parse)*} ($($rest)*) $($rest)*)
643 };
644
645 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($mul:tt $($dup:tt)*) * $($rest:tt)*) => {
646 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $mul) $($parse)*} ($($rest)*) $($rest)*)
647 };
648
649 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($div:tt $($dup:tt)*) / $($rest:tt)*) => {
650 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $div) $($parse)*} ($($rest)*) $($rest)*)
651 };
652
653 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($rem:tt $($dup:tt)*) % $($rest:tt)*) => {
654 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $rem) $($parse)*} ($($rest)*) $($rest)*)
655 };
656
657 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitxor:tt $($dup:tt)*) ^ $($rest:tt)*) => {
658 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $bitxor) $($parse)*} ($($rest)*) $($rest)*)
659 };
660
661 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitand:tt $($dup:tt)*) & $($rest:tt)*) => {
662 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $bitand) $($parse)*} ($($rest)*) $($rest)*)
663 };
664
665 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitor:tt $($dup:tt)*) | $($rest:tt)*) => {
666 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $bitor) $($parse)*} ($($rest)*) $($rest)*)
667 };
668
669 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shl:tt $($dup:tt)*) << $($rest:tt)*) => {
670 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $shl) $($parse)*} ($($rest)*) $($rest)*)
671 };
672
673 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shr:tt $($dup:tt)*) >> $($rest:tt)*) => {
674 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $shr) $($parse)*} ($($rest)*) $($rest)*)
675 };
676
677 // comparison binary operators
678
679 (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($eq:tt $($dup:tt)*) == $($rest:tt)*) => {
680 $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $eq} ($($rest)*) $($rest)*)
681 };
682
683 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($eq:tt $($dup:tt)*) == $($rest:tt)*) => {
684 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $eq) $($parse)*} ($($rest)*) $($rest)*)
685 };
686
687 (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($le:tt $($dup:tt)*) <= $($rest:tt)*) => {
688 $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $le} ($($rest)*) $($rest)*)
689 };
690
691 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($le:tt $($dup:tt)*) <= $($rest:tt)*) => {
692 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $le) $($parse)*} ($($rest)*) $($rest)*)
693 };
694
695 (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($lt:tt $($dup:tt)*) < $($rest:tt)*) => {
696 $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $lt} ($($rest)*) $($rest)*)
697 };
698
699 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($lt:tt $($dup:tt)*) < $($rest:tt)*) => {
700 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $lt) $($parse)*} ($($rest)*) $($rest)*)
701 };
702
703 (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($ne:tt $($dup:tt)*) != $($rest:tt)*) => {
704 $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $ne} ($($rest)*) $($rest)*)
705 };
706
707 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($ne:tt $($dup:tt)*) != $($rest:tt)*) => {
708 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $ne) $($parse)*} ($($rest)*) $($rest)*)
709 };
710
711 (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($ge:tt $($dup:tt)*) >= $($rest:tt)*) => {
712 $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $ge} ($($rest)*) $($rest)*)
713 };
714
715 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($ge:tt $($dup:tt)*) >= $($rest:tt)*) => {
716 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $ge) $($parse)*} ($($rest)*) $($rest)*)
717 };
718
719 (atom () $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($gt:tt $($dup:tt)*) > $($rest:tt)*) => {
720 $crate::__parse_ensure!(0 () $bail ($($fuel)*) {() $($parse)* ($($buf)*) $gt} ($($rest)*) $($rest)*)
721 };
722
723 (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)+) $($parse:tt)*} ($gt:tt $($dup:tt)*) > $($rest:tt)*) => {
724 $crate::__parse_ensure!(0 $stack $bail ($($fuel)*) {($($buf)* $gt) $($parse)*} ($($rest)*) $($rest)*)
725 };
726
727 // low precedence binary operators
728
729 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($and:tt $($dup:tt)*) && $($rest:tt)*) => {
730 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $and) $($parse)*} ($($rest)*) $($rest)*)
731 };
732
733 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($or:tt $($dup:tt)*) || $($rest:tt)*) => {
734 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $or) $($parse)*} ($($rest)*) $($rest)*)
735 };
736
737 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($assign:tt $($dup:tt)*) = $($rest:tt)*) => {
738 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $assign) $($parse)*} ($($rest)*) $($rest)*)
739 };
740
741 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($addeq:tt $($dup:tt)*) += $($rest:tt)*) => {
742 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $addeq) $($parse)*} ($($rest)*) $($rest)*)
743 };
744
745 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($subeq:tt $($dup:tt)*) -= $($rest:tt)*) => {
746 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $subeq) $($parse)*} ($($rest)*) $($rest)*)
747 };
748
749 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($muleq:tt $($dup:tt)*) *= $($rest:tt)*) => {
750 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $muleq) $($parse)*} ($($rest)*) $($rest)*)
751 };
752
753 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($diveq:tt $($dup:tt)*) /= $($rest:tt)*) => {
754 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $diveq) $($parse)*} ($($rest)*) $($rest)*)
755 };
756
757 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($remeq:tt $($dup:tt)*) %= $($rest:tt)*) => {
758 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $remeq) $($parse)*} ($($rest)*) $($rest)*)
759 };
760
761 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitxoreq:tt $($dup:tt)*) ^= $($rest:tt)*) => {
762 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $bitxoreq) $($parse)*} ($($rest)*) $($rest)*)
763 };
764
765 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitandeq:tt $($dup:tt)*) &= $($rest:tt)*) => {
766 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $bitandeq) $($parse)*} ($($rest)*) $($rest)*)
767 };
768
769 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($bitoreq:tt $($dup:tt)*) |= $($rest:tt)*) => {
770 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $bitoreq) $($parse)*} ($($rest)*) $($rest)*)
771 };
772
773 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shleq:tt $($dup:tt)*) <<= $($rest:tt)*) => {
774 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $shleq) $($parse)*} ($($rest)*) $($rest)*)
775 };
776
777 (atom ($($stack:tt)+) $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($shreq:tt $($dup:tt)*) >>= $($rest:tt)*) => {
778 $crate::__parse_ensure!(0 ($($stack)*) $bail ($($fuel)*) {($($buf)* $shreq) $($parse)*} ($($rest)*) $($rest)*)
779 };
780
781 // unrecognized expression
782
783 ($state:tt $stack:tt ($($bail:tt)*) $($rest:tt)*) => {
784 $crate::__fallback_ensure!($($bail)*)
785 };
786 }
787
788 #[doc(hidden)]
789 #[macro_export]
790 macro_rules! __fancy_ensure {
791 ($lhs:expr, $op:tt, $rhs:expr) => {
792 match (&$lhs, &$rhs) {
793 (lhs, rhs) => {
794 if !(lhs $op rhs) {
795 #[allow(unused_imports)]
796 use $crate::__private::{BothDebug, NotBothDebug};
797 return Err((lhs, rhs).__dispatch_ensure(
798 $crate::__private::concat!(
799 "Condition failed: `",
800 $crate::__private::stringify!($lhs),
801 " ",
802 $crate::__private::stringify!($op),
803 " ",
804 $crate::__private::stringify!($rhs),
805 "`",
806 ),
807 ));
808 }
809 }
810 }
811 };
812 }
813
814 #[doc(hidden)]
815 #[macro_export]
816 macro_rules! __fallback_ensure {
817 ($cond:expr $(,)?) => {
818 if !$cond {
819 return $crate::__private::Err($crate::Error::msg(
820 $crate::__private::concat!("Condition failed: `", $crate::__private::stringify!($cond), "`")
821 ));
822 }
823 };
824 ($cond:expr, $msg:literal $(,)?) => {
825 if !$cond {
826 return $crate::__private::Err($crate::__anyhow!($msg));
827 }
828 };
829 ($cond:expr, $err:expr $(,)?) => {
830 if !$cond {
831 return $crate::__private::Err($crate::__anyhow!($err));
832 }
833 };
834 ($cond:expr, $fmt:expr, $($arg:tt)*) => {
835 if !$cond {
836 return $crate::__private::Err($crate::__anyhow!($fmt, $($arg)*));
837 }
838 };
839 }
840