openpgp: Clarify that message::Token is not covered by SemVer.

  - Do this using a deprecation so that anyone using it will get a
    compiler warning.

  - Revert this change once message::Token is private.

  - See #836.

1 files changed, 1 insertions, 0 deletions

diff --git a/openpgp/src/parse.rs b/openpgp/src/parse.rs
index 72241d73..81549c50 100644
--- a/openpgp/src/parse.rs
+++ b/openpgp/src/parse.rs
@@ -4878,6 +4878,7 @@ impl <'a> PacketParser<'a> {
                     // this as opaque content to the message validator.
                     let mut path = self.path().to_vec();
                     path.push(0);
+                    #[allow(deprecated)]
                     self.state.message_validator.push_token(
                         message::Token::OpaqueContent, &path);
                 }