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RalfJungRalfJung
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unused_parens: do not lint against parens around &raw
1 parent 6a2cd0d commit c189796

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4 files changed

+79
-32
lines changed

4 files changed

+79
-32
lines changed

‎compiler/rustc_lint/src/unused.rs

+7
Original file line numberDiff line numberDiff line change
@@ -675,6 +675,13 @@ trait UnusedDelimLint {
675675
return true;
676676
}
677677

678+
// Do not lint against parentheses around `&raw [const|mut] expr`.
679+
// These parentheses will have to be added e.g. when calling a method on the result of this
680+
// expression, and we want to avoid churn wrt adding and removing parentheses.
681+
if matches!(inner.kind, ast::ExprKind::AddrOf(ast::BorrowKind::Raw, ..)) {
682+
return true;
683+
}
684+
678685
// Check if LHS needs parens to prevent false-positives in cases like
679686
// `fn x() -> u8 { ({ 0 } + 1) }`.
680687
//

‎tests/ui/lint/lint-unnecessary-parens.fixed

+8
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
11
//@ run-rustfix
22

33
#![deny(unused_parens)]
4+
#![feature(raw_ref_op)]
45
#![allow(while_true)] // for rustfix
56

67
#[derive(Eq, PartialEq)]
@@ -125,4 +126,11 @@ fn main() {
125126
// FIXME: false positive. This parenthesis is required.
126127
unit! {} - One //~ ERROR unnecessary parentheses around block return value
127128
};
129+
130+
// Do *not* lint around `&raw` (but do lint when `&` creates a reference).
131+
let mut x = 0;
132+
let _r = &x; //~ ERROR unnecessary parentheses
133+
let _r = &mut x; //~ ERROR unnecessary parentheses
134+
let _r = (&raw const x);
135+
let _r = (&raw mut x);
128136
}

‎tests/ui/lint/lint-unnecessary-parens.rs

+8
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
11
//@ run-rustfix
22

33
#![deny(unused_parens)]
4+
#![feature(raw_ref_op)]
45
#![allow(while_true)] // for rustfix
56

67
#[derive(Eq, PartialEq)]
@@ -125,4 +126,11 @@ fn main() {
125126
// FIXME: false positive. This parenthesis is required.
126127
(unit! {} - One) //~ ERROR unnecessary parentheses around block return value
127128
};
129+
130+
// Do *not* lint around `&raw` (but do lint when `&` creates a reference).
131+
let mut x = 0;
132+
let _r = (&x); //~ ERROR unnecessary parentheses
133+
let _r = (&mut x); //~ ERROR unnecessary parentheses
134+
let _r = (&raw const x);
135+
let _r = (&raw mut x);
128136
}

‎tests/ui/lint/lint-unnecessary-parens.stderr

+56-32
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
error: unnecessary parentheses around `return` value
2-
--> $DIR/lint-unnecessary-parens.rs:13:12
2+
--> $DIR/lint-unnecessary-parens.rs:14:12
33
|
44
LL | return (1);
55
| ^ ^
@@ -16,7 +16,7 @@ LL + return 1;
1616
|
1717

1818
error: unnecessary parentheses around `return` value
19-
--> $DIR/lint-unnecessary-parens.rs:16:12
19+
--> $DIR/lint-unnecessary-parens.rs:17:12
2020
|
2121
LL | return (X { y });
2222
| ^ ^
@@ -28,7 +28,7 @@ LL + return X { y };
2828
|
2929

3030
error: unnecessary parentheses around type
31-
--> $DIR/lint-unnecessary-parens.rs:19:46
31+
--> $DIR/lint-unnecessary-parens.rs:20:46
3232
|
3333
LL | pub fn unused_parens_around_return_type() -> (u32) {
3434
| ^ ^
@@ -40,7 +40,7 @@ LL + pub fn unused_parens_around_return_type() -> u32 {
4040
|
4141

4242
error: unnecessary parentheses around block return value
43-
--> $DIR/lint-unnecessary-parens.rs:25:9
43+
--> $DIR/lint-unnecessary-parens.rs:26:9
4444
|
4545
LL | (5)
4646
| ^ ^
@@ -52,7 +52,7 @@ LL + 5
5252
|
5353

5454
error: unnecessary parentheses around block return value
55-
--> $DIR/lint-unnecessary-parens.rs:27:5
55+
--> $DIR/lint-unnecessary-parens.rs:28:5
5656
|
5757
LL | (5)
5858
| ^ ^
@@ -64,7 +64,7 @@ LL + 5
6464
|
6565

6666
error: unnecessary parentheses around `if` condition
67-
--> $DIR/lint-unnecessary-parens.rs:39:7
67+
--> $DIR/lint-unnecessary-parens.rs:40:7
6868
|
6969
LL | if(true) {}
7070
| ^ ^
@@ -76,7 +76,7 @@ LL + if true {}
7676
|
7777

7878
error: unnecessary parentheses around `while` condition
79-
--> $DIR/lint-unnecessary-parens.rs:40:10
79+
--> $DIR/lint-unnecessary-parens.rs:41:10
8080
|
8181
LL | while(true) {}
8282
| ^ ^
@@ -88,7 +88,7 @@ LL + while true {}
8888
|
8989

9090
error: unnecessary parentheses around `for` iterator expression
91-
--> $DIR/lint-unnecessary-parens.rs:41:13
91+
--> $DIR/lint-unnecessary-parens.rs:42:13
9292
|
9393
LL | for _ in(e) {}
9494
| ^ ^
@@ -100,7 +100,7 @@ LL + for _ in e {}
100100
|
101101

102102
error: unnecessary parentheses around `match` scrutinee expression
103-
--> $DIR/lint-unnecessary-parens.rs:42:10
103+
--> $DIR/lint-unnecessary-parens.rs:43:10
104104
|
105105
LL | match(1) { _ => ()}
106106
| ^ ^
@@ -112,7 +112,7 @@ LL + match 1 { _ => ()}
112112
|
113113

114114
error: unnecessary parentheses around `return` value
115-
--> $DIR/lint-unnecessary-parens.rs:43:11
115+
--> $DIR/lint-unnecessary-parens.rs:44:11
116116
|
117117
LL | return(1);
118118
| ^ ^
@@ -124,7 +124,7 @@ LL + return 1;
124124
|
125125

126126
error: unnecessary parentheses around assigned value
127-
--> $DIR/lint-unnecessary-parens.rs:74:31
127+
--> $DIR/lint-unnecessary-parens.rs:75:31
128128
|
129129
LL | pub const CONST_ITEM: usize = (10);
130130
| ^ ^
@@ -136,7 +136,7 @@ LL + pub const CONST_ITEM: usize = 10;
136136
|
137137

138138
error: unnecessary parentheses around assigned value
139-
--> $DIR/lint-unnecessary-parens.rs:75:33
139+
--> $DIR/lint-unnecessary-parens.rs:76:33
140140
|
141141
LL | pub static STATIC_ITEM: usize = (10);
142142
| ^ ^
@@ -148,7 +148,7 @@ LL + pub static STATIC_ITEM: usize = 10;
148148
|
149149

150150
error: unnecessary parentheses around function argument
151-
--> $DIR/lint-unnecessary-parens.rs:79:9
151+
--> $DIR/lint-unnecessary-parens.rs:80:9
152152
|
153153
LL | bar((true));
154154
| ^ ^
@@ -160,7 +160,7 @@ LL + bar(true);
160160
|
161161

162162
error: unnecessary parentheses around `if` condition
163-
--> $DIR/lint-unnecessary-parens.rs:81:8
163+
--> $DIR/lint-unnecessary-parens.rs:82:8
164164
|
165165
LL | if (true) {}
166166
| ^ ^
@@ -172,7 +172,7 @@ LL + if true {}
172172
|
173173

174174
error: unnecessary parentheses around `while` condition
175-
--> $DIR/lint-unnecessary-parens.rs:82:11
175+
--> $DIR/lint-unnecessary-parens.rs:83:11
176176
|
177177
LL | while (true) {}
178178
| ^ ^
@@ -184,7 +184,7 @@ LL + while true {}
184184
|
185185

186186
error: unnecessary parentheses around `match` scrutinee expression
187-
--> $DIR/lint-unnecessary-parens.rs:83:11
187+
--> $DIR/lint-unnecessary-parens.rs:84:11
188188
|
189189
LL | match (true) {
190190
| ^ ^
@@ -196,7 +196,7 @@ LL + match true {
196196
|
197197

198198
error: unnecessary parentheses around `let` scrutinee expression
199-
--> $DIR/lint-unnecessary-parens.rs:86:16
199+
--> $DIR/lint-unnecessary-parens.rs:87:16
200200
|
201201
LL | if let 1 = (1) {}
202202
| ^ ^
@@ -208,7 +208,7 @@ LL + if let 1 = 1 {}
208208
|
209209

210210
error: unnecessary parentheses around `let` scrutinee expression
211-
--> $DIR/lint-unnecessary-parens.rs:87:19
211+
--> $DIR/lint-unnecessary-parens.rs:88:19
212212
|
213213
LL | while let 1 = (2) {}
214214
| ^ ^
@@ -220,7 +220,7 @@ LL + while let 1 = 2 {}
220220
|
221221

222222
error: unnecessary parentheses around method argument
223-
--> $DIR/lint-unnecessary-parens.rs:103:24
223+
--> $DIR/lint-unnecessary-parens.rs:104:24
224224
|
225225
LL | X { y: false }.foo((true));
226226
| ^ ^
@@ -232,7 +232,7 @@ LL + X { y: false }.foo(true);
232232
|
233233

234234
error: unnecessary parentheses around assigned value
235-
--> $DIR/lint-unnecessary-parens.rs:105:18
235+
--> $DIR/lint-unnecessary-parens.rs:106:18
236236
|
237237
LL | let mut _a = (0);
238238
| ^ ^
@@ -244,7 +244,7 @@ LL + let mut _a = 0;
244244
|
245245

246246
error: unnecessary parentheses around assigned value
247-
--> $DIR/lint-unnecessary-parens.rs:106:10
247+
--> $DIR/lint-unnecessary-parens.rs:107:10
248248
|
249249
LL | _a = (0);
250250
| ^ ^
@@ -256,7 +256,7 @@ LL + _a = 0;
256256
|
257257

258258
error: unnecessary parentheses around assigned value
259-
--> $DIR/lint-unnecessary-parens.rs:107:11
259+
--> $DIR/lint-unnecessary-parens.rs:108:11
260260
|
261261
LL | _a += (1);
262262
| ^ ^
@@ -268,7 +268,7 @@ LL + _a += 1;
268268
|
269269

270270
error: unnecessary parentheses around pattern
271-
--> $DIR/lint-unnecessary-parens.rs:109:8
271+
--> $DIR/lint-unnecessary-parens.rs:110:8
272272
|
273273
LL | let(mut _a) = 3;
274274
| ^ ^
@@ -280,7 +280,7 @@ LL + let mut _a = 3;
280280
|
281281

282282
error: unnecessary parentheses around pattern
283-
--> $DIR/lint-unnecessary-parens.rs:110:9
283+
--> $DIR/lint-unnecessary-parens.rs:111:9
284284
|
285285
LL | let (mut _a) = 3;
286286
| ^ ^
@@ -292,7 +292,7 @@ LL + let mut _a = 3;
292292
|
293293

294294
error: unnecessary parentheses around pattern
295-
--> $DIR/lint-unnecessary-parens.rs:111:8
295+
--> $DIR/lint-unnecessary-parens.rs:112:8
296296
|
297297
LL | let( mut _a) = 3;
298298
| ^^ ^
@@ -304,7 +304,7 @@ LL + let mut _a = 3;
304304
|
305305

306306
error: unnecessary parentheses around pattern
307-
--> $DIR/lint-unnecessary-parens.rs:113:8
307+
--> $DIR/lint-unnecessary-parens.rs:114:8
308308
|
309309
LL | let(_a) = 3;
310310
| ^ ^
@@ -316,7 +316,7 @@ LL + let _a = 3;
316316
|
317317

318318
error: unnecessary parentheses around pattern
319-
--> $DIR/lint-unnecessary-parens.rs:114:9
319+
--> $DIR/lint-unnecessary-parens.rs:115:9
320320
|
321321
LL | let (_a) = 3;
322322
| ^ ^
@@ -328,7 +328,7 @@ LL + let _a = 3;
328328
|
329329

330330
error: unnecessary parentheses around pattern
331-
--> $DIR/lint-unnecessary-parens.rs:115:8
331+
--> $DIR/lint-unnecessary-parens.rs:116:8
332332
|
333333
LL | let( _a) = 3;
334334
| ^^ ^
@@ -340,7 +340,7 @@ LL + let _a = 3;
340340
|
341341

342342
error: unnecessary parentheses around block return value
343-
--> $DIR/lint-unnecessary-parens.rs:121:9
343+
--> $DIR/lint-unnecessary-parens.rs:122:9
344344
|
345345
LL | (unit!() - One)
346346
| ^ ^
@@ -352,7 +352,7 @@ LL + unit!() - One
352352
|
353353

354354
error: unnecessary parentheses around block return value
355-
--> $DIR/lint-unnecessary-parens.rs:123:9
355+
--> $DIR/lint-unnecessary-parens.rs:124:9
356356
|
357357
LL | (unit![] - One)
358358
| ^ ^
@@ -364,7 +364,7 @@ LL + unit![] - One
364364
|
365365

366366
error: unnecessary parentheses around block return value
367-
--> $DIR/lint-unnecessary-parens.rs:126:9
367+
--> $DIR/lint-unnecessary-parens.rs:127:9
368368
|
369369
LL | (unit! {} - One)
370370
| ^ ^
@@ -375,5 +375,29 @@ LL - (unit! {} - One)
375375
LL + unit! {} - One
376376
|
377377

378-
error: aborting due to 31 previous errors
378+
error: unnecessary parentheses around assigned value
379+
--> $DIR/lint-unnecessary-parens.rs:132:14
380+
|
381+
LL | let _r = (&x);
382+
| ^ ^
383+
|
384+
help: remove these parentheses
385+
|
386+
LL - let _r = (&x);
387+
LL + let _r = &x;
388+
|
389+
390+
error: unnecessary parentheses around assigned value
391+
--> $DIR/lint-unnecessary-parens.rs:133:14
392+
|
393+
LL | let _r = (&mut x);
394+
| ^ ^
395+
|
396+
help: remove these parentheses
397+
|
398+
LL - let _r = (&mut x);
399+
LL + let _r = &mut x;
400+
|
401+
402+
error: aborting due to 33 previous errors
379403

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