Nim does it as well, but in case of Vala it's a bit different case as it emits glib based code with GObject and friends - basically whole OO system with contain

Nim does it as well, but in case of Vala it's a bit different case as it emits glib based code with GObject and friends - basically whole OO system with containers, event loop and what not. The idea of Vala is that if you're using glib then using Vala will generate glib code as if you'd write it by hand, but much easier. The rationale is much stronger to emit C as you can mix it with existing code etc.