WIP: Well-known types in prost-types needs to be generated again

Open question: How is the `protobuf.rs` generated?

prost-types/src/protobuf.rs

@@ -2292,7 +2292,7 @@ impl NullValue {
 /// the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one can use
 /// the Joda Time's [`ISODateTimeFormat.dateTime()`](<http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime%2D%2D>) to obtain a formatter capable of generating timestamps in this format.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct Timestamp {
     /// Represents seconds of UTC time since Unix epoch
     /// 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to

tests/src/derive_copy.proto

@@ -1,5 +1,7 @@
 syntax = "proto3";
 
+import "google/protobuf/timestamp.proto";
+
 package derive_copy;
 
 message EmptyMsg {}
@@ -39,7 +41,11 @@ message OneOfMsg {
 }
 
 message ComposedMsg {
-    IntegerMsg field1 = 1;
-    EnumMsg field2 = 2;
-    OneOfMsg field3 = 3;
+  IntegerMsg field1 = 1;
+  EnumMsg field2 = 2;
+  OneOfMsg field3 = 3;
+}
+
+message WellKnownMsg {
+  google.protobuf.Timestamp timestamp = 1;
 }

tests/src/derive_copy.rs

@@ -17,3 +17,5 @@ impl TestCopyIsImplemented for EnumMsg {}
 impl TestCopyIsImplemented for OneOfMsg {}
 
 impl TestCopyIsImplemented for ComposedMsg {}
+
+impl TestCopyIsImplemented for WellKnownMsg {}