Rust should have stable tail calls

A proposal and project goal to stabilize explicit tail calls in Rust, targeting stabilization in 2027. The post explains what tail calls are, why they matter for low-level systems code (state machines, interpreters, parsers), and the key blocker: incomplete LLVM backend support across platforms like WebAssembly and PowerPC. The author details recent LLVM fixes for x86_64, loongarch, and riscv, outlines a phased roadmap (starting with extern "Rust" tail calls, then direct codegen, then computed goto via #[loop_match]), and discusses the ergonomic tradeoffs versus alternatives like computed goto. Funding is being sought to advance this work.