Add a reason to/remove some //@no-rustfix annotations (#14839)

changelog: none

tests/ui/assign_ops.fixed

@@ -1,7 +1,9 @@
-use core::num::Wrapping;
+#![allow(clippy::useless_vec)]
+#![warn(clippy::assign_op_pattern)]
+
+use core::num::Wrapping;
+use std::ops::{Mul, MulAssign};
 
-#[allow(dead_code, unused_assignments, clippy::useless_vec)]
-#[warn(clippy::assign_op_pattern)]
 fn main() {
     let mut a = 5;
     a += 1;
@@ -39,3 +41,35 @@ fn main() {
     v[0] = v[0] + v[1];
     let _ = || v[0] = v[0] + v[1];
 }
+
+fn cow_add_assign() {
+    use std::borrow::Cow;
+    let mut buf = Cow::Owned(String::from("bar"));
+    let cows = Cow::Borrowed("foo");
+
+    // this can be linted
+    buf += cows.clone();
+    //~^ assign_op_pattern
+
+    // this should not as cow<str> Add is not commutative
+    buf = cows + buf;
+}
+
+// check that we don't lint on op assign impls, because that's just the way to impl them
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct Wrap(i64);
+
+impl Mul<i64> for Wrap {
+    type Output = Self;
+
+    fn mul(self, rhs: i64) -> Self {
+        Wrap(self.0 * rhs)
+    }
+}
+
+impl MulAssign<i64> for Wrap {
+    fn mul_assign(&mut self, rhs: i64) {
+        *self = *self * rhs
+    }
+}

tests/ui/assign_ops.rs

@@ -1,7 +1,9 @@
-use core::num::Wrapping;
+#![allow(clippy::useless_vec)]
+#![warn(clippy::assign_op_pattern)]
+
+use core::num::Wrapping;
+use std::ops::{Mul, MulAssign};
 
-#[allow(dead_code, unused_assignments, clippy::useless_vec)]
-#[warn(clippy::assign_op_pattern)]
 fn main() {
     let mut a = 5;
     a = a + 1;
@@ -39,3 +41,35 @@ fn main() {
     v[0] = v[0] + v[1];
     let _ = || v[0] = v[0] + v[1];
 }
+
+fn cow_add_assign() {
+    use std::borrow::Cow;
+    let mut buf = Cow::Owned(String::from("bar"));
+    let cows = Cow::Borrowed("foo");
+
+    // this can be linted
+    buf = buf + cows.clone();
+    //~^ assign_op_pattern
+
+    // this should not as cow<str> Add is not commutative
+    buf = cows + buf;
+}
+
+// check that we don't lint on op assign impls, because that's just the way to impl them
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct Wrap(i64);
+
+impl Mul<i64> for Wrap {
+    type Output = Self;
+
+    fn mul(self, rhs: i64) -> Self {
+        Wrap(self.0 * rhs)
+    }
+}
+
+impl MulAssign<i64> for Wrap {
+    fn mul_assign(&mut self, rhs: i64) {
+        *self = *self * rhs
+    }
+}

tests/ui/assign_ops.stderr

@@ -1,5 +1,5 @@
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:7:5
+  --> tests/ui/assign_ops.rs:9:5
    |
 LL |     a = a + 1;
    |     ^^^^^^^^^ help: replace it with: `a += 1`
@@ -8,64 +8,70 @@ LL |     a = a + 1;
    = help: to override `-D warnings` add `#[allow(clippy::assign_op_pattern)]`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:9:5
+  --> tests/ui/assign_ops.rs:11:5
    |
 LL |     a = 1 + a;
    |     ^^^^^^^^^ help: replace it with: `a += 1`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:11:5
+  --> tests/ui/assign_ops.rs:13:5
    |
 LL |     a = a - 1;
    |     ^^^^^^^^^ help: replace it with: `a -= 1`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:13:5
+  --> tests/ui/assign_ops.rs:15:5
    |
 LL |     a = a * 99;
    |     ^^^^^^^^^^ help: replace it with: `a *= 99`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:15:5
+  --> tests/ui/assign_ops.rs:17:5
    |
 LL |     a = 42 * a;
    |     ^^^^^^^^^^ help: replace it with: `a *= 42`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:17:5
+  --> tests/ui/assign_ops.rs:19:5
    |
 LL |     a = a / 2;
    |     ^^^^^^^^^ help: replace it with: `a /= 2`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:19:5
+  --> tests/ui/assign_ops.rs:21:5
    |
 LL |     a = a % 5;
    |     ^^^^^^^^^ help: replace it with: `a %= 5`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:21:5
+  --> tests/ui/assign_ops.rs:23:5
    |
 LL |     a = a & 1;
    |     ^^^^^^^^^ help: replace it with: `a &= 1`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:28:5
+  --> tests/ui/assign_ops.rs:30:5
    |
 LL |     s = s + "bla";
    |     ^^^^^^^^^^^^^ help: replace it with: `s += "bla"`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:33:5
+  --> tests/ui/assign_ops.rs:35:5
    |
 LL |     a = a + Wrapping(1u32);
    |     ^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `a += Wrapping(1u32)`
 
 error: manual implementation of an assign operation
-  --> tests/ui/assign_ops.rs:36:5
+  --> tests/ui/assign_ops.rs:38:5
    |
 LL |     v[0] = v[0] + v[1];
    |     ^^^^^^^^^^^^^^^^^^ help: replace it with: `v[0] += v[1]`
 
-error: aborting due to 11 previous errors
+error: manual implementation of an assign operation
+  --> tests/ui/assign_ops.rs:51:5
+   |
+LL |     buf = buf + cows.clone();
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `buf += cows.clone()`
+
+error: aborting due to 12 previous errors
 

tests/ui/assign_ops2.rs

@@ -1,77 +0,0 @@
-//@no-rustfix: overlapping suggestions
-#![allow(clippy::uninlined_format_args)]
-
-#[allow(unused_assignments)]
-#[warn(clippy::misrefactored_assign_op, clippy::assign_op_pattern)]
-fn main() {
-    let mut a = 5;
-    a += a + 1;
-    //~^ misrefactored_assign_op
-
-    a += 1 + a;
-    //~^ misrefactored_assign_op
-
-    a -= a - 1;
-    //~^ misrefactored_assign_op
-
-    a *= a * 99;
-    //~^ misrefactored_assign_op
-
-    a *= 42 * a;
-    //~^ misrefactored_assign_op
-
-    a /= a / 2;
-    //~^ misrefactored_assign_op
-
-    a %= a % 5;
-    //~^ misrefactored_assign_op
-
-    a &= a & 1;
-    //~^ misrefactored_assign_op
-
-    a *= a * a;
-    //~^ misrefactored_assign_op
-
-    a = a * a * a;
-    a = a * 42 * a;
-    a = a * 2 + a;
-    a -= 1 - a;
-    a /= 5 / a;
-    a %= 42 % a;
-    a <<= 6 << a;
-}
-
-// check that we don't lint on op assign impls, because that's just the way to impl them
-
-use std::ops::{Mul, MulAssign};
-
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub struct Wrap(i64);
-
-impl Mul<i64> for Wrap {
-    type Output = Self;
-
-    fn mul(self, rhs: i64) -> Self {
-        Wrap(self.0 * rhs)
-    }
-}
-
-impl MulAssign<i64> for Wrap {
-    fn mul_assign(&mut self, rhs: i64) {
-        *self = *self * rhs
-    }
-}
-
-fn cow_add_assign() {
-    use std::borrow::Cow;
-    let mut buf = Cow::Owned(String::from("bar"));
-    let cows = Cow::Borrowed("foo");
-
-    // this can be linted
-    buf = buf + cows.clone();
-    //~^ assign_op_pattern
-
-    // this should not as cow<str> Add is not commutative
-    buf = cows + buf;
-    println!("{}", buf);
-}

tests/ui/cast.rs

@@ -1,4 +1,4 @@
-//@no-rustfix
+//@no-rustfix: only some diagnostics have suggestions
 
 #![feature(repr128)]
 #![allow(incomplete_features)]

tests/ui/cast_size.rs

@@ -1,7 +1,7 @@
 //@revisions: 32bit 64bit
 //@[32bit]ignore-bitwidth: 64
 //@[64bit]ignore-bitwidth: 32
-//@no-rustfix
+//@no-rustfix: only some diagnostics have suggestions
 
 #![warn(
     clippy::cast_precision_loss,

tests/ui/checked_unwrap/complex_conditionals_nested.rs

@@ -4,7 +4,7 @@
     clippy::branches_sharing_code,
     clippy::unnecessary_literal_unwrap
 )]
-//@no-rustfix
+//@no-rustfix: has placeholders
 fn test_nested() {
     fn nested() {
         let x = Some(());

tests/ui/checked_unwrap/simple_conditionals.rs

@@ -1,4 +1,4 @@
-//@no-rustfix: overlapping suggestions
+//@no-rustfix: has placeholders
 #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)]
 #![allow(
     clippy::if_same_then_else,

tests/ui/comparison_chain.rs

@@ -1,4 +1,4 @@
-//@no-rustfix
+//@no-rustfix: has placeholders
 #![allow(dead_code)]
 #![warn(clippy::comparison_chain)]
 

tests/ui/dbg_macro/dbg_macro_unfixable.rs

@@ -1,4 +1,4 @@
-//@no-rustfix
+//@no-rustfix: overlapping suggestions
 //@error-in-other-file:
 #![warn(clippy::dbg_macro)]
 

tests/ui/double_ended_iterator_last_unfixable.rs

@@ -1,4 +1,4 @@
-//@no-rustfix
+//@no-rustfix: requires manual changes
 #![warn(clippy::double_ended_iterator_last)]
 
 // Should not be linted because applying the lint would move the original iterator. This can only be

tests/ui/entry_unfixable.rs

@@ -1,6 +1,5 @@
-#![allow(unused, clippy::needless_pass_by_value, clippy::collapsible_if)]
+#![allow(clippy::needless_pass_by_value, clippy::collapsible_if)]
 #![warn(clippy::map_entry)]
-//@no-rustfix
 
 use std::collections::HashMap;
 use std::hash::Hash;

tests/ui/entry_unfixable.stderr

@@ -1,5 +1,5 @@
 error: usage of `contains_key` followed by `insert` on a `HashMap`
-  --> tests/ui/entry_unfixable.rs:28:13
+  --> tests/ui/entry_unfixable.rs:27:13
    |
 LL | /             if !self.values.contains_key(&name) {
 LL | |
@@ -14,7 +14,7 @@ LL | |             }
    = help: to override `-D warnings` add `#[allow(clippy::map_entry)]`
 
 error: usage of `contains_key` followed by `insert` on a `HashMap`
-  --> tests/ui/entry_unfixable.rs:43:5
+  --> tests/ui/entry_unfixable.rs:42:5
    |
 LL | /     if hm.contains_key(&key) {
 LL | |
@@ -26,7 +26,7 @@ LL | |     }
    | |_____^
 
 error: usage of `contains_key` followed by `insert` on a `HashMap`
-  --> tests/ui/entry_unfixable.rs:81:13
+  --> tests/ui/entry_unfixable.rs:80:13
    |
 LL | /             if self.globals.contains_key(&name) {
 LL | |

tests/ui/explicit_counter_loop.rs

@@ -1,6 +1,6 @@
 #![warn(clippy::explicit_counter_loop)]
 #![allow(clippy::uninlined_format_args, clippy::useless_vec)]
-//@no-rustfix
+//@no-rustfix: suggestion does not remove the `+= 1`
 fn main() {
     let mut vec = vec![1, 2, 3, 4];
     let mut _index = 0;

tests/ui/filter_map_bool_then_unfixable.rs

@@ -1,6 +1,5 @@
-#![allow(clippy::question_mark, unused)]
+#![allow(clippy::question_mark)]
 #![warn(clippy::filter_map_bool_then)]
-//@no-rustfix
 
 fn issue11617() {
     let mut x: Vec<usize> = vec![0; 10];

tests/ui/filter_map_bool_then_unfixable.stderr

@@ -1,5 +1,5 @@
 error: usage of `bool::then` in `filter_map`
-  --> tests/ui/filter_map_bool_then_unfixable.rs:7:48
+  --> tests/ui/filter_map_bool_then_unfixable.rs:6:48
    |
 LL |       let _ = (0..x.len()).zip(x.clone().iter()).filter_map(|(i, v)| {
    |  ________________________________________________^
@@ -16,7 +16,7 @@ LL | |     });
    = help: to override `-D warnings` add `#[allow(clippy::filter_map_bool_then)]`
 
 error: usage of `bool::then` in `filter_map`
-  --> tests/ui/filter_map_bool_then_unfixable.rs:23:26
+  --> tests/ui/filter_map_bool_then_unfixable.rs:22:26
    |
 LL |         let _ = x.iter().filter_map(|&x| x?.then(|| do_something(())));
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -24,7 +24,7 @@ LL |         let _ = x.iter().filter_map(|&x| x?.then(|| do_something(())));
    = help: consider using `filter` then `map` instead
 
 error: usage of `bool::then` in `filter_map`
-  --> tests/ui/filter_map_bool_then_unfixable.rs:27:14
+  --> tests/ui/filter_map_bool_then_unfixable.rs:26:14
    |
 LL |             .filter_map(|&x| if let Some(x) = x { x } else { return None }.then(|| do_something(())));
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -32,7 +32,7 @@ LL |             .filter_map(|&x| if let Some(x) = x { x } else { return None }.
    = help: consider using `filter` then `map` instead
 
 error: usage of `bool::then` in `filter_map`
-  --> tests/ui/filter_map_bool_then_unfixable.rs:29:26
+  --> tests/ui/filter_map_bool_then_unfixable.rs:28:26
    |
 LL |           let _ = x.iter().filter_map(|&x| {
    |  __________________________^
@@ -47,7 +47,7 @@ LL | |         });
    = help: consider using `filter` then `map` instead
 
 error: usage of `bool::then` in `filter_map`
-  --> tests/ui/filter_map_bool_then_unfixable.rs:47:26
+  --> tests/ui/filter_map_bool_then_unfixable.rs:46:26
    |
 LL |           let _ = x.iter().filter_map(|&x| {
    |  __________________________^

tests/ui/impl_trait_in_params.rs

@@ -1,7 +1,7 @@
 #![allow(unused)]
 #![warn(clippy::impl_trait_in_params)]
 
-//@no-rustfix
+//@no-rustfix: has placeholders
 pub trait Trait {}
 pub trait AnotherTrait<T> {}
 

tests/ui/infinite_loop.rs

@@ -1,5 +1,3 @@
-//@no-rustfix
-
 fn fn_val(i: i32) -> i32 {
     unimplemented!()
 }

tests/ui/infinite_loop.stderr

@@ -1,5 +1,5 @@
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:22:11
+  --> tests/ui/infinite_loop.rs:20:11
    |
 LL |     while y < 10 {
    |           ^^^^^^
@@ -8,7 +8,7 @@ LL |     while y < 10 {
    = note: `#[deny(clippy::while_immutable_condition)]` on by default
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:29:11
+  --> tests/ui/infinite_loop.rs:27:11
    |
 LL |     while y < 10 && x < 3 {
    |           ^^^^^^^^^^^^^^^
@@ -16,7 +16,7 @@ LL |     while y < 10 && x < 3 {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:38:11
+  --> tests/ui/infinite_loop.rs:36:11
    |
 LL |     while !cond {
    |           ^^^^^
@@ -24,7 +24,7 @@ LL |     while !cond {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:84:11
+  --> tests/ui/infinite_loop.rs:82:11
    |
 LL |     while i < 3 {
    |           ^^^^^
@@ -32,7 +32,7 @@ LL |     while i < 3 {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:91:11
+  --> tests/ui/infinite_loop.rs:89:11
    |
 LL |     while i < 3 && j > 0 {
    |           ^^^^^^^^^^^^^^
@@ -40,7 +40,7 @@ LL |     while i < 3 && j > 0 {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:97:11
+  --> tests/ui/infinite_loop.rs:95:11
    |
 LL |     while i < 3 {
    |           ^^^^^
@@ -48,7 +48,7 @@ LL |     while i < 3 {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:114:11
+  --> tests/ui/infinite_loop.rs:112:11
    |
 LL |     while i < 3 {
    |           ^^^^^
@@ -56,7 +56,7 @@ LL |     while i < 3 {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:121:11
+  --> tests/ui/infinite_loop.rs:119:11
    |
 LL |     while i < 3 {
    |           ^^^^^
@@ -64,7 +64,7 @@ LL |     while i < 3 {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:189:15
+  --> tests/ui/infinite_loop.rs:187:15
    |
 LL |         while self.count < n {
    |               ^^^^^^^^^^^^^^
@@ -72,7 +72,7 @@ LL |         while self.count < n {
    = note: this may lead to an infinite or to a never running loop
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:199:11
+  --> tests/ui/infinite_loop.rs:197:11
    |
 LL |     while y < 10 {
    |           ^^^^^^
@@ -82,7 +82,7 @@ LL |     while y < 10 {
    = help: rewrite it as `if cond { loop { } }`
 
 error: variables in the condition are not mutated in the loop body
-  --> tests/ui/infinite_loop.rs:208:11
+  --> tests/ui/infinite_loop.rs:206:11
    |
 LL |     while y < 10 {
    |           ^^^^^^

tests/ui/infinite_loops.rs

@@ -1,4 +1,4 @@
-//@no-rustfix
+//@no-rustfix: multiple suggestions add `-> !` to the same fn
 //@aux-build:proc_macros.rs
 
 #![allow(clippy::never_loop)]

tests/ui/into_iter_without_iter.rs

@@ -1,4 +1,4 @@
-//@no-rustfix
+//@no-rustfix: suggestions reference out of scope lifetimes/types
 //@aux-build:proc_macros.rs
 #![warn(clippy::into_iter_without_iter)]
 extern crate proc_macros;

tests/ui/iter_out_of_bounds.rs

@@ -1,5 +1,3 @@
-//@no-rustfix
-
 #![deny(clippy::iter_out_of_bounds)]
 #![allow(clippy::useless_vec)]
 

tests/ui/iter_out_of_bounds.stderr

@@ -1,18 +1,18 @@
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:12:14
+  --> tests/ui/iter_out_of_bounds.rs:10:14
    |
 LL |     for _ in [1, 2, 3].iter().skip(4) {
    |              ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this operation is useless and will create an empty iterator
 note: the lint level is defined here
-  --> tests/ui/iter_out_of_bounds.rs:3:9
+  --> tests/ui/iter_out_of_bounds.rs:1:9
    |
 LL | #![deny(clippy::iter_out_of_bounds)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: this `.take()` call takes more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:17:19
+  --> tests/ui/iter_out_of_bounds.rs:15:19
    |
 LL |     for (i, _) in [1, 2, 3].iter().take(4).enumerate() {
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -20,7 +20,7 @@ LL |     for (i, _) in [1, 2, 3].iter().take(4).enumerate() {
    = note: this operation is useless and the returned iterator will simply yield the same items
 
 error: this `.take()` call takes more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:24:14
+  --> tests/ui/iter_out_of_bounds.rs:22:14
    |
 LL |     for _ in (&&&&&&[1, 2, 3]).iter().take(4) {}
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -28,7 +28,7 @@ LL |     for _ in (&&&&&&[1, 2, 3]).iter().take(4) {}
    = note: this operation is useless and the returned iterator will simply yield the same items
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:27:14
+  --> tests/ui/iter_out_of_bounds.rs:25:14
    |
 LL |     for _ in [1, 2, 3].iter().skip(4) {}
    |              ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -36,7 +36,7 @@ LL |     for _ in [1, 2, 3].iter().skip(4) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:30:14
+  --> tests/ui/iter_out_of_bounds.rs:28:14
    |
 LL |     for _ in [1; 3].iter().skip(4) {}
    |              ^^^^^^^^^^^^^^^^^^^^^
@@ -44,7 +44,7 @@ LL |     for _ in [1; 3].iter().skip(4) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:36:14
+  --> tests/ui/iter_out_of_bounds.rs:34:14
    |
 LL |     for _ in vec![1, 2, 3].iter().skip(4) {}
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -52,7 +52,7 @@ LL |     for _ in vec![1, 2, 3].iter().skip(4) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:39:14
+  --> tests/ui/iter_out_of_bounds.rs:37:14
    |
 LL |     for _ in vec![1; 3].iter().skip(4) {}
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -60,7 +60,7 @@ LL |     for _ in vec![1; 3].iter().skip(4) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:43:14
+  --> tests/ui/iter_out_of_bounds.rs:41:14
    |
 LL |     for _ in x.iter().skip(4) {}
    |              ^^^^^^^^^^^^^^^^
@@ -68,7 +68,7 @@ LL |     for _ in x.iter().skip(4) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:47:14
+  --> tests/ui/iter_out_of_bounds.rs:45:14
    |
 LL |     for _ in x.iter().skip(n) {}
    |              ^^^^^^^^^^^^^^^^
@@ -76,7 +76,7 @@ LL |     for _ in x.iter().skip(n) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:52:14
+  --> tests/ui/iter_out_of_bounds.rs:50:14
    |
 LL |     for _ in empty().skip(1) {}
    |              ^^^^^^^^^^^^^^^
@@ -84,7 +84,7 @@ LL |     for _ in empty().skip(1) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.take()` call takes more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:55:14
+  --> tests/ui/iter_out_of_bounds.rs:53:14
    |
 LL |     for _ in empty().take(1) {}
    |              ^^^^^^^^^^^^^^^
@@ -92,7 +92,7 @@ LL |     for _ in empty().take(1) {}
    = note: this operation is useless and the returned iterator will simply yield the same items
 
 error: this `.skip()` call skips more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:58:14
+  --> tests/ui/iter_out_of_bounds.rs:56:14
    |
 LL |     for _ in std::iter::once(1).skip(2) {}
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -100,7 +100,7 @@ LL |     for _ in std::iter::once(1).skip(2) {}
    = note: this operation is useless and will create an empty iterator
 
 error: this `.take()` call takes more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:61:14
+  --> tests/ui/iter_out_of_bounds.rs:59:14
    |
 LL |     for _ in std::iter::once(1).take(2) {}
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -108,7 +108,7 @@ LL |     for _ in std::iter::once(1).take(2) {}
    = note: this operation is useless and the returned iterator will simply yield the same items
 
 error: this `.take()` call takes more items than the iterator will produce
-  --> tests/ui/iter_out_of_bounds.rs:64:14
+  --> tests/ui/iter_out_of_bounds.rs:62:14
    |
 LL |     for x in [].iter().take(1) {
    |              ^^^^^^^^^^^^^^^^^

tests/ui/misrefactored_assign_op.1.fixed

@@ -0,0 +1,40 @@
+#![allow(clippy::eq_op)]
+#![warn(clippy::misrefactored_assign_op, clippy::assign_op_pattern)]
+
+fn main() {
+    let mut a = 5;
+    a += 1;
+    //~^ misrefactored_assign_op
+
+    a += 1;
+    //~^ misrefactored_assign_op
+
+    a -= 1;
+    //~^ misrefactored_assign_op
+
+    a *= 99;
+    //~^ misrefactored_assign_op
+
+    a *= 42;
+    //~^ misrefactored_assign_op
+
+    a /= 2;
+    //~^ misrefactored_assign_op
+
+    a %= 5;
+    //~^ misrefactored_assign_op
+
+    a &= 1;
+    //~^ misrefactored_assign_op
+
+    a *= a;
+    //~^ misrefactored_assign_op
+
+    a = a * a * a;
+    a = a * 42 * a;
+    a = a * 2 + a;
+    a -= 1 - a;
+    a /= 5 / a;
+    a %= 42 % a;
+    a <<= 6 << a;
+}

tests/ui/misrefactored_assign_op.2.fixed

@@ -0,0 +1,40 @@
+#![allow(clippy::eq_op)]
+#![warn(clippy::misrefactored_assign_op, clippy::assign_op_pattern)]
+
+fn main() {
+    let mut a = 5;
+    a = a + a + 1;
+    //~^ misrefactored_assign_op
+
+    a = a + 1 + a;
+    //~^ misrefactored_assign_op
+
+    a = a - (a - 1);
+    //~^ misrefactored_assign_op
+
+    a = a * a * 99;
+    //~^ misrefactored_assign_op
+
+    a = a * 42 * a;
+    //~^ misrefactored_assign_op
+
+    a = a / (a / 2);
+    //~^ misrefactored_assign_op
+
+    a = a % (a % 5);
+    //~^ misrefactored_assign_op
+
+    a = a & a & 1;
+    //~^ misrefactored_assign_op
+
+    a = a * a * a;
+    //~^ misrefactored_assign_op
+
+    a = a * a * a;
+    a = a * 42 * a;
+    a = a * 2 + a;
+    a -= 1 - a;
+    a /= 5 / a;
+    a %= 42 % a;
+    a <<= 6 << a;
+}

tests/ui/misrefactored_assign_op.rs

@@ -0,0 +1,40 @@
+#![allow(clippy::eq_op)]
+#![warn(clippy::misrefactored_assign_op, clippy::assign_op_pattern)]
+
+fn main() {
+    let mut a = 5;
+    a += a + 1;
+    //~^ misrefactored_assign_op
+
+    a += 1 + a;
+    //~^ misrefactored_assign_op
+
+    a -= a - 1;
+    //~^ misrefactored_assign_op
+
+    a *= a * 99;
+    //~^ misrefactored_assign_op
+
+    a *= 42 * a;
+    //~^ misrefactored_assign_op
+
+    a /= a / 2;
+    //~^ misrefactored_assign_op
+
+    a %= a % 5;
+    //~^ misrefactored_assign_op
+
+    a &= a & 1;
+    //~^ misrefactored_assign_op
+
+    a *= a * a;
+    //~^ misrefactored_assign_op
+
+    a = a * a * a;
+    a = a * 42 * a;
+    a = a * 2 + a;
+    a -= 1 - a;
+    a /= 5 / a;
+    a %= 42 % a;
+    a <<= 6 << a;
+}

tests/ui/misrefactored_assign_op.stderr

@@ -1,5 +1,5 @@
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:8:5
+  --> tests/ui/misrefactored_assign_op.rs:6:5
    |
 LL |     a += a + 1;
    |     ^^^^^^^^^^
@@ -18,7 +18,7 @@ LL +     a = a + a + 1;
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:11:5
+  --> tests/ui/misrefactored_assign_op.rs:9:5
    |
 LL |     a += 1 + a;
    |     ^^^^^^^^^^
@@ -35,7 +35,7 @@ LL +     a = a + 1 + a;
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:14:5
+  --> tests/ui/misrefactored_assign_op.rs:12:5
    |
 LL |     a -= a - 1;
    |     ^^^^^^^^^^
@@ -52,7 +52,7 @@ LL +     a = a - (a - 1);
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:17:5
+  --> tests/ui/misrefactored_assign_op.rs:15:5
    |
 LL |     a *= a * 99;
    |     ^^^^^^^^^^^
@@ -69,7 +69,7 @@ LL +     a = a * a * 99;
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:20:5
+  --> tests/ui/misrefactored_assign_op.rs:18:5
    |
 LL |     a *= 42 * a;
    |     ^^^^^^^^^^^
@@ -86,7 +86,7 @@ LL +     a = a * 42 * a;
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:23:5
+  --> tests/ui/misrefactored_assign_op.rs:21:5
    |
 LL |     a /= a / 2;
    |     ^^^^^^^^^^
@@ -103,7 +103,7 @@ LL +     a = a / (a / 2);
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:26:5
+  --> tests/ui/misrefactored_assign_op.rs:24:5
    |
 LL |     a %= a % 5;
    |     ^^^^^^^^^^
@@ -120,7 +120,7 @@ LL +     a = a % (a % 5);
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:29:5
+  --> tests/ui/misrefactored_assign_op.rs:27:5
    |
 LL |     a &= a & 1;
    |     ^^^^^^^^^^
@@ -137,7 +137,7 @@ LL +     a = a & a & 1;
    |
 
 error: variable appears on both sides of an assignment operation
-  --> tests/ui/assign_ops2.rs:32:5
+  --> tests/ui/misrefactored_assign_op.rs:30:5
    |
 LL |     a *= a * a;
    |     ^^^^^^^^^^
@@ -153,14 +153,5 @@ LL -     a *= a * a;
 LL +     a = a * a * a;
    |
 
-error: manual implementation of an assign operation
-  --> tests/ui/assign_ops2.rs:71:5
-   |
-LL |     buf = buf + cows.clone();
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `buf += cows.clone()`
-   |
-   = note: `-D clippy::assign-op-pattern` implied by `-D warnings`
-   = help: to override `-D warnings` add `#[allow(clippy::assign_op_pattern)]`
-
-error: aborting due to 10 previous errors
+error: aborting due to 9 previous errors