63bbdb31e5
6897: Basic support for macros 2.0 r=jonas-schievink a=jonas-schievink This adds support for (built-in-only) macros 2.0, and removes some hacks used for builtin derives, which are declared via macros 2.0 in libcore. First steps for https://github.com/rust-analyzer/rust-analyzer/issues/2248. Blocked on https://github.com/rust-analyzer/ungrammar/pull/16. Co-authored-by: Jonas Schievink <jonasschievink@gmail.com> Co-authored-by: Jonas Schievink <jonas.schievink@ferrous-systems.com>