src/test/compile-fail/lint-stability.rs

   1 // Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // aux-build:lint_stability.rs
  12 // aux-build:inherited_stability.rs
  13 // aux-build:stability_cfg1.rs
  14 // aux-build:stability_cfg2.rs
  15
  16 #![deny(deprecated)]
  17 #![allow(dead_code)]
  18 #![feature(staged_api)]
  19 #![staged_api]
  20
  21 #[macro_use]
  22 extern crate lint_stability;
  23
  24 mod cross_crate {
  25     extern crate stability_cfg1;
  26     extern crate stability_cfg2; //~ ERROR use of unstable library feature
  27
  28     use lint_stability::*;
  29
  30     fn test() {
  31         type Foo = MethodTester;
  32         let foo = MethodTester;
  33
  34         deprecated(); //~ ERROR use of deprecated item
  35         foo.method_deprecated(); //~ ERROR use of deprecated item
  36         Foo::method_deprecated(&foo); //~ ERROR use of deprecated item
  37         <Foo>::method_deprecated(&foo); //~ ERROR use of deprecated item
  38         foo.trait_deprecated(); //~ ERROR use of deprecated item
  39         Trait::trait_deprecated(&foo); //~ ERROR use of deprecated item
  40         <Foo>::trait_deprecated(&foo); //~ ERROR use of deprecated item
  41         <Foo as Trait>::trait_deprecated(&foo); //~ ERROR use of deprecated item
  42
  43         deprecated_text(); //~ ERROR use of deprecated item: text
  44         foo.method_deprecated_text(); //~ ERROR use of deprecated item: text
  45         Foo::method_deprecated_text(&foo); //~ ERROR use of deprecated item: text
  46         <Foo>::method_deprecated_text(&foo); //~ ERROR use of deprecated item: text
  47         foo.trait_deprecated_text(); //~ ERROR use of deprecated item: text
  48         Trait::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
  49         <Foo>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
  50         <Foo as Trait>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
  51
  52         deprecated_unstable(); //~ ERROR use of deprecated item
  53         //~^ ERROR use of unstable library feature
  54         foo.method_deprecated_unstable(); //~ ERROR use of deprecated item
  55         //~^ ERROR use of unstable library feature
  56         Foo::method_deprecated_unstable(&foo); //~ ERROR use of deprecated item
  57         //~^ ERROR use of unstable library feature
  58         <Foo>::method_deprecated_unstable(&foo); //~ ERROR use of deprecated item
  59         //~^ ERROR use of unstable library feature
  60         foo.trait_deprecated_unstable(); //~ ERROR use of deprecated item
  61         //~^ ERROR use of unstable library feature
  62         Trait::trait_deprecated_unstable(&foo); //~ ERROR use of deprecated item
  63         //~^ ERROR use of unstable library feature
  64         <Foo>::trait_deprecated_unstable(&foo); //~ ERROR use of deprecated item
  65         //~^ ERROR use of unstable library feature
  66         <Foo as Trait>::trait_deprecated_unstable(&foo); //~ ERROR use of deprecated item
  67         //~^ ERROR use of unstable library feature
  68
  69         deprecated_unstable_text(); //~ ERROR use of deprecated item: text
  70         //~^ ERROR use of unstable library feature
  71         foo.method_deprecated_unstable_text(); //~ ERROR use of deprecated item: text
  72         //~^ ERROR use of unstable library feature
  73         Foo::method_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
  74         //~^ ERROR use of unstable library feature
  75         <Foo>::method_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
  76         //~^ ERROR use of unstable library feature
  77         foo.trait_deprecated_unstable_text(); //~ ERROR use of deprecated item: text
  78         //~^ ERROR use of unstable library feature
  79         Trait::trait_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
  80         //~^ ERROR use of unstable library feature
  81         <Foo>::trait_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
  82         //~^ ERROR use of unstable library feature
  83         <Foo as Trait>::trait_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
  84         //~^ ERROR use of unstable library feature
  85
  86         unstable(); //~ ERROR use of unstable library feature
  87         foo.method_unstable(); //~ ERROR use of unstable library feature
  88         Foo::method_unstable(&foo); //~ ERROR use of unstable library feature
  89         <Foo>::method_unstable(&foo); //~ ERROR use of unstable library feature
  90         foo.trait_unstable(); //~ ERROR use of unstable library feature
  91         Trait::trait_unstable(&foo); //~ ERROR use of unstable library feature
  92         <Foo>::trait_unstable(&foo); //~ ERROR use of unstable library feature
  93         <Foo as Trait>::trait_unstable(&foo); //~ ERROR use of unstable library feature
  94
  95         unstable_text();
  96         //~^ ERROR use of unstable library feature 'test_feature': text
  97         foo.method_unstable_text();
  98         //~^ ERROR use of unstable library feature 'test_feature': text
  99         Foo::method_unstable_text(&foo);
 100         //~^ ERROR use of unstable library feature 'test_feature': text
 101         <Foo>::method_unstable_text(&foo);
 102         //~^ ERROR use of unstable library feature 'test_feature': text
 103         foo.trait_unstable_text();
 104         //~^ ERROR use of unstable library feature 'test_feature': text
 105         Trait::trait_unstable_text(&foo);
 106         //~^ ERROR use of unstable library feature 'test_feature': text
 107         <Foo>::trait_unstable_text(&foo);
 108         //~^ ERROR use of unstable library feature 'test_feature': text
 109         <Foo as Trait>::trait_unstable_text(&foo);
 110         //~^ ERROR use of unstable library feature 'test_feature': text
 111
 112         stable();
 113         foo.method_stable();
 114         Foo::method_stable(&foo);
 115         <Foo>::method_stable(&foo);
 116         foo.trait_stable();
 117         Trait::trait_stable(&foo);
 118         <Foo>::trait_stable(&foo);
 119         <Foo as Trait>::trait_stable(&foo);
 120
 121         stable_text();
 122         foo.method_stable_text();
 123         Foo::method_stable_text(&foo);
 124         <Foo>::method_stable_text(&foo);
 125         foo.trait_stable_text();
 126         Trait::trait_stable_text(&foo);
 127         <Foo>::trait_stable_text(&foo);
 128         <Foo as Trait>::trait_stable_text(&foo);
 129
 130         let _ = DeprecatedStruct { i: 0 }; //~ ERROR use of deprecated item
 131         let _ = DeprecatedUnstableStruct { i: 0 }; //~ ERROR use of deprecated item
 132         //~^ ERROR use of unstable library feature
 133         let _ = UnstableStruct { i: 0 }; //~ ERROR use of unstable library feature
 134         let _ = StableStruct { i: 0 };
 135
 136         let _ = DeprecatedUnitStruct; //~ ERROR use of deprecated item
 137         let _ = DeprecatedUnstableUnitStruct; //~ ERROR use of deprecated item
 138         //~^ ERROR use of unstable library feature
 139         let _ = UnstableUnitStruct; //~ ERROR use of unstable library feature
 140         let _ = StableUnitStruct;
 141
 142         let _ = Enum::DeprecatedVariant; //~ ERROR use of deprecated item
 143         let _ = Enum::DeprecatedUnstableVariant; //~ ERROR use of deprecated item
 144         //~^ ERROR use of unstable library feature
 145         let _ = Enum::UnstableVariant; //~ ERROR use of unstable library feature
 146         let _ = Enum::StableVariant;
 147
 148         let _ = DeprecatedTupleStruct (1); //~ ERROR use of deprecated item
 149         let _ = DeprecatedUnstableTupleStruct (1); //~ ERROR use of deprecated item
 150         //~^ ERROR use of unstable library feature
 151         let _ = UnstableTupleStruct (1); //~ ERROR use of unstable library feature
 152         let _ = StableTupleStruct (1);
 153
 154         // At the moment, the lint checker only checks stability in
 155         // in the arguments of macros.
 156         // Eventually, we will want to lint the contents of the
 157         // macro in the module *defining* it. Also, stability levels
 158         // on macros themselves are not yet linted.
 159         macro_test_arg!(deprecated_text()); //~ ERROR use of deprecated item: text
 160         macro_test_arg!(deprecated_unstable_text()); //~ ERROR use of deprecated item: text
 161         //~^ ERROR use of unstable library feature
 162         macro_test_arg!(macro_test_arg!(deprecated_text())); //~ ERROR use of deprecated item: text
 163     }
 164
 165     fn test_method_param<Foo: Trait>(foo: Foo) {
 166         foo.trait_deprecated(); //~ ERROR use of deprecated item
 167         Trait::trait_deprecated(&foo); //~ ERROR use of deprecated item
 168         <Foo>::trait_deprecated(&foo); //~ ERROR use of deprecated item
 169         <Foo as Trait>::trait_deprecated(&foo); //~ ERROR use of deprecated item
 170         foo.trait_deprecated_text(); //~ ERROR use of deprecated item: text
 171         Trait::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 172         <Foo>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 173         <Foo as Trait>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 174         foo.trait_deprecated_unstable(); //~ ERROR use of deprecated item
 175         //~^ ERROR use of unstable library feature
 176         Trait::trait_deprecated_unstable(&foo); //~ ERROR use of deprecated item
 177         //~^ ERROR use of unstable library feature
 178         <Foo>::trait_deprecated_unstable(&foo); //~ ERROR use of deprecated item
 179         //~^ ERROR use of unstable library feature
 180         <Foo as Trait>::trait_deprecated_unstable(&foo); //~ ERROR use of deprecated item
 181         //~^ ERROR use of unstable library feature
 182         foo.trait_deprecated_unstable_text(); //~ ERROR use of deprecated item: text
 183         //~^ ERROR use of unstable library feature
 184         Trait::trait_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
 185         //~^ ERROR use of unstable library feature
 186         <Foo>::trait_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
 187         //~^ ERROR use of unstable library feature
 188         <Foo as Trait>::trait_deprecated_unstable_text(&foo); //~ ERROR use of deprecated item: text
 189         //~^ ERROR use of unstable library feature
 190         foo.trait_unstable(); //~ ERROR use of unstable library feature
 191         Trait::trait_unstable(&foo); //~ ERROR use of unstable library feature
 192         <Foo>::trait_unstable(&foo); //~ ERROR use of unstable library feature
 193         <Foo as Trait>::trait_unstable(&foo); //~ ERROR use of unstable library feature
 194         foo.trait_unstable_text();
 195         //~^ ERROR use of unstable library feature 'test_feature': text
 196         Trait::trait_unstable_text(&foo);
 197         //~^ ERROR use of unstable library feature 'test_feature': text
 198         <Foo>::trait_unstable_text(&foo);
 199         //~^ ERROR use of unstable library feature 'test_feature': text
 200         <Foo as Trait>::trait_unstable_text(&foo);
 201         //~^ ERROR use of unstable library feature 'test_feature': text
 202         foo.trait_stable();
 203         Trait::trait_stable(&foo);
 204         <Foo>::trait_stable(&foo);
 205         <Foo as Trait>::trait_stable(&foo);
 206     }
 207
 208     fn test_method_object(foo: &Trait) {
 209         foo.trait_deprecated(); //~ ERROR use of deprecated item
 210         foo.trait_deprecated_text(); //~ ERROR use of deprecated item: text
 211         foo.trait_deprecated_unstable(); //~ ERROR use of deprecated item
 212         //~^ ERROR use of unstable library feature
 213         foo.trait_deprecated_unstable_text(); //~ ERROR use of deprecated item: text
 214         //~^ ERROR use of unstable library feature
 215         foo.trait_unstable(); //~ ERROR use of unstable library feature
 216         foo.trait_unstable_text();
 217         //~^ ERROR use of unstable library feature 'test_feature': text
 218         foo.trait_stable();
 219     }
 220
 221     struct S;
 222
 223     impl UnstableTrait for S { } //~ ERROR use of unstable library feature
 224
 225     trait LocalTrait : UnstableTrait { } //~ ERROR use of unstable library feature
 226
 227     impl Trait for S {
 228         fn trait_stable(&self) {}
 229         fn trait_unstable(&self) {} //~ ERROR use of unstable library feature
 230     }
 231 }
 232
 233 mod inheritance {
 234     extern crate inherited_stability; //~ ERROR use of unstable library feature
 235     use self::inherited_stability::*; //~ ERROR use of unstable library feature
 236
 237     fn test_inheritance() {
 238         unstable(); //~ ERROR use of unstable library feature
 239         stable();
 240
 241         stable_mod::unstable(); //~ ERROR use of unstable library feature
 242         stable_mod::stable();
 243
 244         unstable_mod::deprecated(); //~ ERROR use of deprecated item
 245         unstable_mod::unstable(); //~ ERROR use of unstable library feature
 246
 247         let _ = Unstable::UnstableVariant; //~ ERROR use of unstable library feature
 248         let _ = Unstable::StableVariant;
 249
 250         let x: usize = 0;
 251         x.unstable(); //~ ERROR use of unstable library feature
 252         x.stable();
 253     }
 254 }
 255
 256 mod this_crate {
 257     #[unstable(feature = "test_feature")]
 258     #[deprecated(since = "1.0.0")]
 259     pub fn deprecated() {}
 260     #[unstable(feature = "test_feature")]
 261     #[deprecated(since = "1.0.0", reason = "text")]
 262     pub fn deprecated_text() {}
 263
 264     #[unstable(feature = "test_feature")]
 265     pub fn unstable() {}
 266     #[unstable(feature = "test_feature", reason = "text")]
 267     pub fn unstable_text() {}
 268
 269     #[stable(feature = "rust1", since = "1.0.0")]
 270     pub fn stable() {}
 271     #[stable(feature = "rust1", since = "1.0.0", reason = "text")]
 272     pub fn stable_text() {}
 273
 274     #[stable(feature = "rust1", since = "1.0.0")]
 275     pub struct MethodTester;
 276
 277     impl MethodTester {
 278         #[unstable(feature = "test_feature")]
 279         #[deprecated(since = "1.0.0")]
 280         pub fn method_deprecated(&self) {}
 281         #[unstable(feature = "test_feature")]
 282         #[deprecated(since = "1.0.0", reason = "text")]
 283         pub fn method_deprecated_text(&self) {}
 284
 285         #[unstable(feature = "test_feature")]
 286         pub fn method_unstable(&self) {}
 287         #[unstable(feature = "test_feature", reason = "text")]
 288         pub fn method_unstable_text(&self) {}
 289
 290         #[stable(feature = "rust1", since = "1.0.0")]
 291         pub fn method_stable(&self) {}
 292         #[stable(feature = "rust1", since = "1.0.0", reason = "text")]
 293         pub fn method_stable_text(&self) {}
 294     }
 295
 296     pub trait Trait {
 297         #[unstable(feature = "test_feature")]
 298         #[deprecated(since = "1.0.0")]
 299         fn trait_deprecated(&self) {}
 300         #[unstable(feature = "test_feature")]
 301         #[deprecated(since = "1.0.0", reason = "text")]
 302         fn trait_deprecated_text(&self) {}
 303
 304         #[unstable(feature = "test_feature")]
 305         fn trait_unstable(&self) {}
 306         #[unstable(feature = "test_feature", reason = "text")]
 307         fn trait_unstable_text(&self) {}
 308
 309         #[stable(feature = "rust1", since = "1.0.0")]
 310         fn trait_stable(&self) {}
 311         #[stable(feature = "rust1", since = "1.0.0", reason = "text")]
 312         fn trait_stable_text(&self) {}
 313     }
 314
 315     impl Trait for MethodTester {}
 316
 317     #[unstable(feature = "test_feature")]
 318     #[deprecated(since = "1.0.0")]
 319     pub struct DeprecatedStruct {
 320         #[stable(feature = "test_feature", since = "1.0.0")] i: isize
 321     }
 322     #[unstable(feature = "test_feature")]
 323     pub struct UnstableStruct {
 324         #[stable(feature = "test_feature", since = "1.0.0")] i: isize
 325     }
 326     #[stable(feature = "rust1", since = "1.0.0")]
 327     pub struct StableStruct {
 328         #[stable(feature = "test_feature", since = "1.0.0")] i: isize
 329     }
 330
 331     #[unstable(feature = "test_feature")]
 332     #[deprecated(since = "1.0.0")]
 333     pub struct DeprecatedUnitStruct;
 334     #[unstable(feature = "test_feature")]
 335     pub struct UnstableUnitStruct;
 336     #[stable(feature = "rust1", since = "1.0.0")]
 337     pub struct StableUnitStruct;
 338
 339     pub enum Enum {
 340         #[unstable(feature = "test_feature")]
 341         #[deprecated(since = "1.0.0")]
 342         DeprecatedVariant,
 343         #[unstable(feature = "test_feature")]
 344         UnstableVariant,
 345
 346         #[stable(feature = "rust1", since = "1.0.0")]
 347         StableVariant,
 348     }
 349
 350     #[unstable(feature = "test_feature")]
 351     #[deprecated(since = "1.0.0")]
 352     pub struct DeprecatedTupleStruct(isize);
 353     #[unstable(feature = "test_feature")]
 354     pub struct UnstableTupleStruct(isize);
 355     #[stable(feature = "rust1", since = "1.0.0")]
 356     pub struct StableTupleStruct(isize);
 357
 358     fn test() {
 359         // Only the deprecated cases of the following should generate
 360         // errors, because other stability attributes now have meaning
 361         // only *across* crates, not within a single crate.
 362
 363         type Foo = MethodTester;
 364         let foo = MethodTester;
 365
 366         deprecated(); //~ ERROR use of deprecated item
 367         foo.method_deprecated(); //~ ERROR use of deprecated item
 368         Foo::method_deprecated(&foo); //~ ERROR use of deprecated item
 369         <Foo>::method_deprecated(&foo); //~ ERROR use of deprecated item
 370         foo.trait_deprecated(); //~ ERROR use of deprecated item
 371         Trait::trait_deprecated(&foo); //~ ERROR use of deprecated item
 372         <Foo>::trait_deprecated(&foo); //~ ERROR use of deprecated item
 373         <Foo as Trait>::trait_deprecated(&foo); //~ ERROR use of deprecated item
 374
 375         deprecated_text(); //~ ERROR use of deprecated item: text
 376         foo.method_deprecated_text(); //~ ERROR use of deprecated item: text
 377         Foo::method_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 378         <Foo>::method_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 379         foo.trait_deprecated_text(); //~ ERROR use of deprecated item: text
 380         Trait::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 381         <Foo>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 382         <Foo as Trait>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 383
 384         unstable();
 385         foo.method_unstable();
 386         Foo::method_unstable(&foo);
 387         <Foo>::method_unstable(&foo);
 388         foo.trait_unstable();
 389         Trait::trait_unstable(&foo);
 390         <Foo>::trait_unstable(&foo);
 391         <Foo as Trait>::trait_unstable(&foo);
 392
 393         unstable_text();
 394         foo.method_unstable_text();
 395         Foo::method_unstable_text(&foo);
 396         <Foo>::method_unstable_text(&foo);
 397         foo.trait_unstable_text();
 398         Trait::trait_unstable_text(&foo);
 399         <Foo>::trait_unstable_text(&foo);
 400         <Foo as Trait>::trait_unstable_text(&foo);
 401
 402         stable();
 403         foo.method_stable();
 404         Foo::method_stable(&foo);
 405         <Foo>::method_stable(&foo);
 406         foo.trait_stable();
 407         Trait::trait_stable(&foo);
 408         <Foo>::trait_stable(&foo);
 409         <Foo as Trait>::trait_stable(&foo);
 410
 411         stable_text();
 412         foo.method_stable_text();
 413         Foo::method_stable_text(&foo);
 414         <Foo>::method_stable_text(&foo);
 415         foo.trait_stable_text();
 416         Trait::trait_stable_text(&foo);
 417         <Foo>::trait_stable_text(&foo);
 418         <Foo as Trait>::trait_stable_text(&foo);
 419
 420         let _ = DeprecatedStruct { i: 0 }; //~ ERROR use of deprecated item
 421         let _ = UnstableStruct { i: 0 };
 422         let _ = StableStruct { i: 0 };
 423
 424         let _ = DeprecatedUnitStruct; //~ ERROR use of deprecated item
 425         let _ = UnstableUnitStruct;
 426         let _ = StableUnitStruct;
 427
 428         let _ = Enum::DeprecatedVariant; //~ ERROR use of deprecated item
 429         let _ = Enum::UnstableVariant;
 430         let _ = Enum::StableVariant;
 431
 432         let _ = DeprecatedTupleStruct (1); //~ ERROR use of deprecated item
 433         let _ = UnstableTupleStruct (1);
 434         let _ = StableTupleStruct (1);
 435     }
 436
 437     fn test_method_param<Foo: Trait>(foo: Foo) {
 438         foo.trait_deprecated(); //~ ERROR use of deprecated item
 439         Trait::trait_deprecated(&foo); //~ ERROR use of deprecated item
 440         <Foo>::trait_deprecated(&foo); //~ ERROR use of deprecated item
 441         <Foo as Trait>::trait_deprecated(&foo); //~ ERROR use of deprecated item
 442         foo.trait_deprecated_text(); //~ ERROR use of deprecated item: text
 443         Trait::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 444         <Foo>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 445         <Foo as Trait>::trait_deprecated_text(&foo); //~ ERROR use of deprecated item: text
 446         foo.trait_unstable();
 447         Trait::trait_unstable(&foo);
 448         <Foo>::trait_unstable(&foo);
 449         <Foo as Trait>::trait_unstable(&foo);
 450         foo.trait_unstable_text();
 451         Trait::trait_unstable_text(&foo);
 452         <Foo>::trait_unstable_text(&foo);
 453         <Foo as Trait>::trait_unstable_text(&foo);
 454         foo.trait_stable();
 455         Trait::trait_stable(&foo);
 456         <Foo>::trait_stable(&foo);
 457         <Foo as Trait>::trait_stable(&foo);
 458     }
 459
 460     fn test_method_object(foo: &Trait) {
 461         foo.trait_deprecated(); //~ ERROR use of deprecated item
 462         foo.trait_deprecated_text(); //~ ERROR use of deprecated item: text
 463         foo.trait_unstable();
 464         foo.trait_unstable_text();
 465         foo.trait_stable();
 466     }
 467
 468     #[unstable(feature = "test_feature")]
 469     #[deprecated(since = "1.0.0")]
 470     fn test_fn_body() {
 471         fn fn_in_body() {}
 472         fn_in_body();
 473     }
 474
 475     impl MethodTester {
 476         #[unstable(feature = "test_feature")]
 477         #[deprecated(since = "1.0.0")]
 478         fn test_method_body(&self) {
 479             fn fn_in_body() {}
 480             fn_in_body();
 481         }
 482     }
 483
 484     #[unstable(feature = "test_feature")]
 485     #[deprecated(since = "1.0.0")]
 486     pub trait DeprecatedTrait {
 487         fn dummy(&self) { }
 488     }
 489
 490     struct S;
 491
 492     impl DeprecatedTrait for S { } //~ ERROR use of deprecated item
 493
 494     trait LocalTrait : DeprecatedTrait { } //~ ERROR use of deprecated item
 495 }
 496
 497 fn main() {}