Clean up some now-unnecessary or_default()s

PiperOrigin-RevId: 616946153

rust/proxied.rs

@@ -170,7 +170,7 @@ pub trait MutProxy<'msg>: ViewProxy<'msg> {
     /// example:
     ///
     /// ```ignore
-    ///   let mut sub: Mut<SubMsg> = msg.submsg_mut().or_default();
+    ///   let mut sub: Mut<SubMsg> = msg.submsg_mut();
     ///   sub.as_mut().field_x_mut().set(10);  // field_x_mut is fn(self)
     ///   sub.field_y_mut().set(20);  // `sub` is now consumed
     /// ```

rust/test/shared/accessors_proto3_test.rs

@@ -183,7 +183,7 @@ fn test_oneof_accessors() {
     assert_that!(msg.oneof_uint32_opt(), eq(Optional::Unset(0)));
     assert_that!(msg.oneof_field(), matches_pattern!(not_set(_)));
 
-    msg.oneof_nested_message_mut().or_default(); // Cause the nested_message field to become set.
+    msg.oneof_nested_message_mut(); // Cause the nested_message field to become set.
 
     assert_that!(msg.oneof_bytes_opt(), matches_pattern!(Optional::Unset(_)));
     assert_that!(msg.oneof_field(), matches_pattern!(OneofNestedMessage(_)));

rust/test/shared/accessors_test.rs

@@ -492,7 +492,7 @@ fn test_singular_msg_field() {
     // testing reading an int inside a view
     assert_that!(msg_view.bb(), eq(0));
 
-    let mut nested_msg_mut: NestedMessageMut = msg.optional_nested_message_mut().or_default();
+    let mut nested_msg_mut: NestedMessageMut = msg.optional_nested_message_mut();
     // test reading an int inside a mut
     assert_that!(nested_msg_mut.bb(), eq(0));
 
@@ -543,12 +543,12 @@ fn test_setting_submsg() {
 }
 
 #[test]
-fn test_msg_or_default() {
+fn test_msg_mut_initializes() {
     let mut msg = TestAllTypes::new();
     assert_that!(msg.optional_nested_message_opt().is_set(), eq(false));
 
-    let _ = msg.optional_nested_message_mut().or_default();
-    // confirm that that or_default makes the field Present
+    let _ = msg.optional_nested_message_mut();
+    // confirm that that optional_nested_message_mut makes the field Present
     assert_that!(msg.optional_nested_message_opt().is_set(), eq(true));
 
     msg.clear_optional_nested_message();
@@ -757,7 +757,7 @@ fn test_group() {
     assert_that!(m.optionalgroup_opt().is_set(), eq(false));
     assert_that!(m.optionalgroup().a(), eq(0));
 
-    m.optionalgroup_mut().or_default().set_a(7);
+    m.optionalgroup_mut().set_a(7);
     assert_that!(m.optionalgroup_opt().is_set(), eq(true));
     assert_that!(m.optionalgroup().a(), eq(7));
 }

rust/test/shared/simple_nested_test.rs

@@ -103,10 +103,10 @@ fn test_recursive_view() {
 #[test]
 fn test_recursive_mut() {
     let mut rec = nested_proto::Recursive::new();
-    let mut one = rec.rec_mut().or_default();
-    let mut two = one.rec_mut().or_default();
-    let mut three = two.rec_mut().or_default();
-    let mut four = three.rec_mut().or_default();
+    let mut one = rec.rec_mut();
+    let mut two = one.rec_mut();
+    let mut three = two.rec_mut();
+    let mut four = three.rec_mut();
 
     four.set_num(1);
     assert_that!(four.num(), eq(1));