Do not mention 'immutable' in suggestion

Author: Henri Lunnikivi

clippy_lints/src/field_reassign_with_default.rs

@@ -84,7 +84,7 @@ impl LateLintPass<'_> for FieldReassignWithDefault {
             }
 
             // if there are incorrectly assigned fields, do a span_lint_and_note to suggest
-            // immutable construction using `Ty { fields, ..Default::default() }`
+            // construction using `Ty { fields, ..Default::default() }`
             if !assigned_fields.is_empty() {
                 // take the original assignment as span
                 let stmt = &block.stmts[stmt_idx];
@@ -107,7 +107,7 @@ impl LateLintPass<'_> for FieldReassignWithDefault {
                             first_assign.unwrap_or_else(|| unreachable!()).span,
                             "field assignment outside of initializer for an instance created with Default::default()",
                             Some(preceding_local.span),
-                            &format!("consider initializing the variable immutably with `{}`", sugg),
+                            &format!("consider initializing the variable with `{}`", 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 immutably with `A { i: 42, ..Default::default() }`
+note: consider initializing the variable with `A { i: 42, ..Default::default() }`
   --> $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.i = 42;
    |     ^^^^^^^^^
    |
-note: consider initializing the variable immutably with `A { i: 42, j: 43, ..Default::default() }`
+note: consider initializing the variable with `A { i: 42, j: 43, ..Default::default() }`
   --> $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 immutably with `A { i: 42, j: 43, ..Default::default() }`
+note: consider initializing the variable with `A { i: 42, j: 43, ..Default::default() }`
   --> $DIR/field_reassign_with_default.rs:61:5
    |
 LL |     let mut a: A = Default::default();