94e93749ab
proc_macro/bridge: stop using a remote object handle for proc_macro Punct and Group This is the third part of https://github.com/rust-lang/rust/pull/86822, split off as requested in https://github.com/rust-lang/rust/pull/86822#pullrequestreview-1008655452. This patch transforms the `Punct` and `Group` types into structs serialized over IPC rather than handles, making them more efficient to create and manipulate from within proc-macros.