warning: group syntax is deprecated
  --> testdata/fields/groups/ok.proto:9:14
   |
 9 |     optional group FooBar = 1 {
   |              ^^^^^
   = note: group syntax is not available in proto3 or editions

warning: group syntax is deprecated
  --> testdata/fields/groups/ok.proto:13:18
   |
13 |         repeated group X_Y_Z = 2 [deprecated = true] {
   |                  ^^^^^
   = note: group syntax is not available in proto3 or editions

warning: group syntax is deprecated
  --> testdata/fields/groups/ok.proto:14:22
   |
14 |             required group Baz = 3 {}
   |                      ^^^^^
   = note: group syntax is not available in proto3 or editions

encountered 3 warnings
