Add run-rustfix for assign_ops test

tests/ui/assign_ops.fixed

@@ -0,0 +1,21 @@
+// run-rustfix
+
+#[allow(dead_code, unused_assignments)]
+#[warn(clippy::assign_op_pattern)]
+fn main() {
+    let mut a = 5;
+    a += 1;
+    a += 1;
+    a -= 1;
+    a *= 99;
+    a *= 42;
+    a /= 2;
+    a %= 5;
+    a &= 1;
+    a = 1 - a;
+    a = 5 / a;
+    a = 42 % a;
+    a = 6 << a;
+    let mut s = String::new();
+    s += "bla";
+}

tests/ui/assign_ops.rs

@@ -1,3 +1,5 @@
+// run-rustfix
+
 #[allow(dead_code, unused_assignments)]
 #[warn(clippy::assign_op_pattern)]
 fn main() {

tests/ui/assign_ops.stderr

@@ -1,5 +1,5 @@
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:5:5
+  --> $DIR/assign_ops.rs:7:5
    |
 LL |     a = a + 1;
    |     ^^^^^^^^^ help: replace it with: `a += 1`
@@ -7,49 +7,49 @@ LL |     a = a + 1;
    = note: `-D clippy::assign-op-pattern` implied by `-D warnings`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:6:5
+  --> $DIR/assign_ops.rs:8:5
    |
 LL |     a = 1 + a;
    |     ^^^^^^^^^ help: replace it with: `a += 1`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:7:5
+  --> $DIR/assign_ops.rs:9:5
    |
 LL |     a = a - 1;
    |     ^^^^^^^^^ help: replace it with: `a -= 1`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:8:5
+  --> $DIR/assign_ops.rs:10:5
    |
 LL |     a = a * 99;
    |     ^^^^^^^^^^ help: replace it with: `a *= 99`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:9:5
+  --> $DIR/assign_ops.rs:11:5
    |
 LL |     a = 42 * a;
    |     ^^^^^^^^^^ help: replace it with: `a *= 42`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:10:5
+  --> $DIR/assign_ops.rs:12:5
    |
 LL |     a = a / 2;
    |     ^^^^^^^^^ help: replace it with: `a /= 2`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:11:5
+  --> $DIR/assign_ops.rs:13:5
    |
 LL |     a = a % 5;
    |     ^^^^^^^^^ help: replace it with: `a %= 5`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:12:5
+  --> $DIR/assign_ops.rs:14:5
    |
 LL |     a = a & 1;
    |     ^^^^^^^^^ help: replace it with: `a &= 1`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:18:5
+  --> $DIR/assign_ops.rs:20:5
    |
 LL |     s = s + "bla";
    |     ^^^^^^^^^^^^^ help: replace it with: `s += "bla"`