A Rust-in-GCC update

Philip Herron has posted an update on the status of the GCC front-endcompiler for the Rust language.

For some context, my current project plan brings us to November2022 where we (unexpected events permitting) should be able tosupport valid Rust code targeting Rustc version ~1.40 and reuselibcore, liballoc and libstd. This date does not account for theborrow checker feature and the proc macro crate, which we have aplan to implement, but this will be a further six-month project.