My understanding of point #2 is that LLVM may still try to devirtualize the call, which would reduce the performance impact -- is that true for Rust? I know it happens sometimes in C++.
Also for proc macros, rust-analyzer seems to struggle with them sometimes as well, so I try to avoid them (outside Serde, which is worth any price) for that reason.
rust-analyzer for a long time expands all kinds of proc-macros. The only project it does not work (although to be honest I didn't really tried) is rustc.
Also for proc macros, rust-analyzer seems to struggle with them sometimes as well, so I try to avoid them (outside Serde, which is worth any price) for that reason.