events: Put pdu module behind an unstable feature flag

crates/ruma-events/Cargo.toml

@@ -20,6 +20,7 @@ compat = ["ruma-events-macros/compat"]
 markdown = ["pulldown-cmark"]
 
 unstable-exhaustive-types = []
+unstable-pdu = []
 unstable-pre-spec = []
 
 [dependencies]

crates/ruma-events/src/lib.rs

@@ -161,6 +161,8 @@ pub mod forwarded_room_key;
 pub mod fully_read;
 pub mod ignored_user_list;
 pub mod key;
+#[cfg(feature = "unstable-pdu")]
+#[cfg_attr(docsrs, doc(cfg(feature = "unstable-pdu")))]
 pub mod pdu;
 pub mod policy;
 pub mod presence;

crates/ruma-events/tests/pdu.rs

@@ -1,4 +1,4 @@
-#![cfg(not(feature = "unstable-pre-spec"))]
+#![cfg(all(feature = "unstable-pdu", not(feature = "unstable-pre-spec")))]
 
 use std::{collections::BTreeMap, convert::TryInto};
 

crates/ruma-state-res/Cargo.toml

@@ -34,6 +34,7 @@ tracing = "0.1.26"
 criterion = "0.3.3"
 maplit = "1.0.2"
 rand = "0.8.3"
+ruma-events = { version = "0.24.5", path = "../ruma-events", features = ["unstable-pdu"] }
 tracing-subscriber = "0.2.15"
 
 [[bench]]