Add note about removing assignments in suggestion

Author: Henri Lunnikivi

clippy_lints/src/field_reassign_with_default.rs

@@ -140,7 +140,10 @@ impl LateLintPass<'_> for FieldReassignWithDefault {
                         first_assign.unwrap().span,
                         "field assignment outside of initializer for an instance created with Default::default()",
                         Some(preceding_local.span),
-                        &format!("consider initializing the variable with `{}`", sugg),
+                        &format!(
+                            "consider initializing the variable with `{}` and removing relevant reassignments",
+                            sugg
+                        ),
                     );
                 }
             }

tests/ui/field_reassign_with_default.stderr

@@ -5,7 +5,7 @@ LL |     a.i = 42;
    |     ^^^^^^^^^
    |
    = note: `-D clippy::field-reassign-with-default` implied by `-D warnings`
-note: consider initializing the variable with `A { i: 42, ..Default::default() }`
+note: consider initializing the variable with `A { i: 42, ..Default::default() }` and removing relevant reassignments
   --> $DIR/field_reassign_with_default.rs:16:5
    |
 LL |     let mut a: A = Default::default();
@@ -17,7 +17,7 @@ error: field assignment outside of initializer for an instance created with Defa
 LL |     a.j = 43;
    |     ^^^^^^^^^
    |
-note: consider initializing the variable with `A { j: 43, i: 42 }`
+note: consider initializing the variable with `A { j: 43, i: 42 }` and removing relevant reassignments
   --> $DIR/field_reassign_with_default.rs:56:5
    |
 LL |     let mut a: A = Default::default();
@@ -29,7 +29,7 @@ error: field assignment outside of initializer for an instance created with Defa
 LL |     a.i = 42;
    |     ^^^^^^^^^
    |
-note: consider initializing the variable with `A { i: 42, j: 44 }`
+note: consider initializing the variable with `A { i: 42, j: 44 }` and removing relevant reassignments
   --> $DIR/field_reassign_with_default.rs:61:5
    |
 LL |     let mut a: A = Default::default();
@@ -41,7 +41,7 @@ error: field assignment outside of initializer for an instance created with Defa
 LL |     a.i = 42;
    |     ^^^^^^^^^
    |
-note: consider initializing the variable with `A { i: 42, ..Default::default() }`
+note: consider initializing the variable with `A { i: 42, ..Default::default() }` and removing relevant reassignments
   --> $DIR/field_reassign_with_default.rs:67:5
    |
 LL |     let mut a = A::default();
@@ -53,7 +53,7 @@ error: field assignment outside of initializer for an instance created with Defa
 LL |     a.i = Default::default();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-note: consider initializing the variable with `A::default()`
+note: consider initializing the variable with `A::default()` and removing relevant reassignments
   --> $DIR/field_reassign_with_default.rs:77:5
    |
 LL |     let mut a: A = Default::default();
@@ -65,7 +65,7 @@ error: field assignment outside of initializer for an instance created with Defa
 LL |     a.i = Default::default();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-note: consider initializing the variable with `A { j: 45, ..Default::default() }`
+note: consider initializing the variable with `A { j: 45, ..Default::default() }` and removing relevant reassignments
   --> $DIR/field_reassign_with_default.rs:81:5
    |
 LL |     let mut a: A = Default::default();