src/tools/clippy/tests/ui/useless_conversion.stderr

error: useless conversion to the same type: `T`
  --> tests/ui/useless_conversion.rs:10:13
   |
LL |     let _ = T::from(val);
   |             ^^^^^^^^^^^^ help: consider removing `T::from()`: `val`
   |
note: the lint level is defined here
  --> tests/ui/useless_conversion.rs:1:9
   |
LL | #![deny(clippy::useless_conversion)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: useless conversion to the same type: `T`
  --> tests/ui/useless_conversion.rs:12:5
   |
LL |     val.into()
   |     ^^^^^^^^^^ help: consider removing `.into()`: `val`

error: useless conversion to the same type: `i32`
  --> tests/ui/useless_conversion.rs:25:22
   |
LL |         let _: i32 = 0i32.into();
   |                      ^^^^^^^^^^^ help: consider removing `.into()`: `0i32`

error: useless conversion to the same type: `std::str::Lines<'_>`
  --> tests/ui/useless_conversion.rs:56:22
   |
LL |     if Some("ok") == lines.into_iter().next() {}
   |                      ^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `lines`

error: useless conversion to the same type: `std::str::Lines<'_>`
  --> tests/ui/useless_conversion.rs:62:21
   |
LL |     let mut lines = text.lines().into_iter();
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `text.lines()`

error: useless conversion to the same type: `std::str::Lines<'_>`
  --> tests/ui/useless_conversion.rs:69:22
   |
LL |     if Some("ok") == text.lines().into_iter().next() {}
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `text.lines()`

error: useless conversion to the same type: `std::ops::Range<i32>`
  --> tests/ui/useless_conversion.rs:76:13
   |
LL |     let _ = NUMBERS.into_iter().next();
   |             ^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `NUMBERS`

error: useless conversion to the same type: `std::ops::Range<i32>`
  --> tests/ui/useless_conversion.rs:82:17
   |
LL |     let mut n = NUMBERS.into_iter();
   |                 ^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `NUMBERS`

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:141:17
   |
LL |         consume(items.into_iter());
   |                 ^^^^^^^^^^^^^^^^^
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:137:28
   |
LL |         fn consume(_: impl IntoIterator) {}
   |                            ^^^^^^^^^^^^
help: consider removing the `.into_iter()`
   |
LL -         consume(items.into_iter());
LL +         consume(*items);
   |

error: useless conversion to the same type: `std::string::String`
  --> tests/ui/useless_conversion.rs:154:21
   |
LL |     let _: String = "foo".to_string().into();
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `"foo".to_string()`

error: useless conversion to the same type: `std::string::String`
  --> tests/ui/useless_conversion.rs:156:21
   |
LL |     let _: String = From::from("foo".to_string());
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `From::from()`: `"foo".to_string()`

error: useless conversion to the same type: `std::string::String`
  --> tests/ui/useless_conversion.rs:158:13
   |
LL |     let _ = String::from("foo".to_string());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `"foo".to_string()`

error: useless conversion to the same type: `std::string::String`
  --> tests/ui/useless_conversion.rs:160:13
   |
LL |     let _ = String::from(format!("A: {:04}", 123));
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("A: {:04}", 123)`

error: useless conversion to the same type: `std::str::Lines<'_>`
  --> tests/ui/useless_conversion.rs:162:13
   |
LL |     let _ = "".lines().into_iter();
   |             ^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `"".lines()`

error: useless conversion to the same type: `std::vec::IntoIter<i32>`
  --> tests/ui/useless_conversion.rs:164:13
   |
LL |     let _ = vec![1, 2, 3].into_iter().into_iter();
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `vec![1, 2, 3].into_iter()`

error: useless conversion to the same type: `std::string::String`
  --> tests/ui/useless_conversion.rs:166:21
   |
LL |     let _: String = format!("Hello {}", "world").into();
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `format!("Hello {}", "world")`

error: useless conversion to the same type: `i32`
  --> tests/ui/useless_conversion.rs:172:13
   |
LL |     let _ = i32::from(a + b) * 3;
   |             ^^^^^^^^^^^^^^^^ help: consider removing `i32::from()`: `(a + b)`

error: useless conversion to the same type: `Foo<'a'>`
  --> tests/ui/useless_conversion.rs:179:23
   |
LL |     let _: Foo<'a'> = s2.into();
   |                       ^^^^^^^^^ help: consider removing `.into()`: `s2`

error: useless conversion to the same type: `Foo<'a'>`
  --> tests/ui/useless_conversion.rs:182:13
   |
LL |     let _ = Foo::<'a'>::from(s3);
   |             ^^^^^^^^^^^^^^^^^^^^ help: consider removing `Foo::<'a'>::from()`: `s3`

error: useless conversion to the same type: `std::vec::IntoIter<Foo<'a'>>`
  --> tests/ui/useless_conversion.rs:185:13
   |
LL |     let _ = vec![s4, s4, s4].into_iter().into_iter();
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `vec![s4, s4, s4].into_iter()`

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:218:7
   |
LL |     b(vec![1, 2].into_iter());
   |       ^^^^^^^^^^------------
   |                 |
   |                 help: consider removing the `.into_iter()`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:208:13
   |
LL |     fn b<T: IntoIterator<Item = i32>>(_: T) {}
   |             ^^^^^^^^^^^^^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:220:7
   |
LL |     c(vec![1, 2].into_iter());
   |       ^^^^^^^^^^------------
   |                 |
   |                 help: consider removing the `.into_iter()`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:209:18
   |
LL |     fn c(_: impl IntoIterator<Item = i32>) {}
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:222:7
   |
LL |     d(vec![1, 2].into_iter());
   |       ^^^^^^^^^^------------
   |                 |
   |                 help: consider removing the `.into_iter()`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:212:12
   |
LL |         T: IntoIterator<Item = i32>,
   |            ^^^^^^^^^^^^^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:226:7
   |
LL |     b(vec![1, 2].into_iter().into_iter());
   |       ^^^^^^^^^^------------------------
   |                 |
   |                 help: consider removing the `.into_iter()`s
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:208:13
   |
LL |     fn b<T: IntoIterator<Item = i32>>(_: T) {}
   |             ^^^^^^^^^^^^^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:228:7
   |
LL |     b(vec![1, 2].into_iter().into_iter().into_iter());
   |       ^^^^^^^^^^------------------------------------
   |                 |
   |                 help: consider removing the `.into_iter()`s
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:208:13
   |
LL |     fn b<T: IntoIterator<Item = i32>>(_: T) {}
   |             ^^^^^^^^^^^^^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:275:24
   |
LL |         foo2::<i32, _>([1, 2, 3].into_iter());
   |                        ^^^^^^^^^------------
   |                                 |
   |                                 help: consider removing the `.into_iter()`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:254:12
   |
LL |         I: IntoIterator<Item = i32> + Helper<X>,
   |            ^^^^^^^^^^^^^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:284:14
   |
LL |         foo3([1, 2, 3].into_iter());
   |              ^^^^^^^^^------------
   |                       |
   |                       help: consider removing the `.into_iter()`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:263:12
   |
LL |         I: IntoIterator<Item = i32>,
   |            ^^^^^^^^^^^^^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:294:16
   |
LL |         S1.foo([1, 2].into_iter());
   |                ^^^^^^------------
   |                      |
   |                      help: consider removing the `.into_iter()`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:291:27
   |
LL |             pub fn foo<I: IntoIterator>(&self, _: I) {}
   |                           ^^^^^^^^^^^^

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:314:44
   |
LL |         v0.into_iter().interleave_shortest(v1.into_iter());
   |                                            ^^------------
   |                                              |
   |                                              help: consider removing the `.into_iter()`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:301:20
   |
LL |                 J: IntoIterator,
   |                    ^^^^^^^^^^^^

error: useless conversion to the same type: `()`
  --> tests/ui/useless_conversion.rs:342:58
   |
LL |     let _: Result<(), std::io::Error> = test_issue_3913().map(Into::into);
   |                                                          ^^^^^^^^^^^^^^^^ help: consider removing

error: useless conversion to the same type: `std::io::Error`
  --> tests/ui/useless_conversion.rs:345:58
   |
LL |     let _: Result<(), std::io::Error> = test_issue_3913().map_err(Into::into);
   |                                                          ^^^^^^^^^^^^^^^^^^^^ help: consider removing

error: useless conversion to the same type: `()`
  --> tests/ui/useless_conversion.rs:348:58
   |
LL |     let _: Result<(), std::io::Error> = test_issue_3913().map(From::from);
   |                                                          ^^^^^^^^^^^^^^^^ help: consider removing

error: useless conversion to the same type: `std::io::Error`
  --> tests/ui/useless_conversion.rs:351:58
   |
LL |     let _: Result<(), std::io::Error> = test_issue_3913().map_err(From::from);
   |                                                          ^^^^^^^^^^^^^^^^^^^^ help: consider removing

error: useless conversion to the same type: `()`
  --> tests/ui/useless_conversion.rs:355:31
   |
LL |     let _: ControlFlow<()> = c.map_break(Into::into);
   |                               ^^^^^^^^^^^^^^^^^^^^^^ help: consider removing

error: useless conversion to the same type: `()`
  --> tests/ui/useless_conversion.rs:359:31
   |
LL |     let _: ControlFlow<()> = c.map_continue(Into::into);
   |                               ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing

error: useless conversion to the same type: `u32`
  --> tests/ui/useless_conversion.rs:373:41
   |
LL |     let _: Vec<u32> = [1u32].into_iter().map(Into::into).collect();
   |                                         ^^^^^^^^^^^^^^^^ help: consider removing

error: useless conversion to the same type: `T`
  --> tests/ui/useless_conversion.rs:384:18
   |
LL |     x.into_iter().map(Into::into).collect()
   |                  ^^^^^^^^^^^^^^^^ help: consider removing

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:400:29
   |
LL |             takes_into_iter(self.my_field.into_iter());
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:389:32
   |
LL |     fn takes_into_iter(_: impl IntoIterator<Item = String>) {}
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider removing the `.into_iter()`
   |
LL -             takes_into_iter(self.my_field.into_iter());
LL +             takes_into_iter(&self.my_field);
   |

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:408:29
   |
LL |             takes_into_iter(self.my_field.into_iter());
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:389:32
   |
LL |     fn takes_into_iter(_: impl IntoIterator<Item = String>) {}
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider removing the `.into_iter()`
   |
LL -             takes_into_iter(self.my_field.into_iter());
LL +             takes_into_iter(&mut self.my_field);
   |

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:417:29
   |
LL |             takes_into_iter(self.my_field.into_iter());
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:389:32
   |
LL |     fn takes_into_iter(_: impl IntoIterator<Item = String>) {}
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider removing the `.into_iter()`
   |
LL -             takes_into_iter(self.my_field.into_iter());
LL +             takes_into_iter(*self.my_field);
   |

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:426:29
   |
LL |             takes_into_iter(self.my_field.into_iter());
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:389:32
   |
LL |     fn takes_into_iter(_: impl IntoIterator<Item = String>) {}
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider removing the `.into_iter()`
   |
LL -             takes_into_iter(self.my_field.into_iter());
LL +             takes_into_iter(&*self.my_field);
   |

error: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> tests/ui/useless_conversion.rs:435:29
   |
LL |             takes_into_iter(self.my_field.into_iter());
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> tests/ui/useless_conversion.rs:389:32
   |
LL |     fn takes_into_iter(_: impl IntoIterator<Item = String>) {}
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider removing the `.into_iter()`
   |
LL -             takes_into_iter(self.my_field.into_iter());
LL +             takes_into_iter(&mut *self.my_field);
   |

error: useless conversion to the same type: `std::ops::Range<u32>`
  --> tests/ui/useless_conversion.rs:450:5
   |
LL |     R.into_iter().for_each(|_x| {});
   |     ^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `R`

error: useless conversion to the same type: `std::ops::Range<u32>`
  --> tests/ui/useless_conversion.rs:452:13
   |
LL |     let _ = R.into_iter().map(|_x| 0);
   |             ^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `R`

error: useless conversion to the same type: `std::slice::Iter<'_, i32>`
  --> tests/ui/useless_conversion.rs:463:14
   |
LL |     for _ in mac!(iter [1, 2]).into_iter() {}
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `mac!(iter [1, 2])`

error: aborting due to 45 previous errors