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The Vala language, in which I implement Odysseus, is (much like CoffeeScript is to JS) a relatively simple transpiler to C. One who's main job is to add additional typechecking & abstract most uses of function pointers, void pointers, & memory management away behind pretty C#-like syntax.
That is it parsed it's own Syntax to an AST, typechecks it, compiles it down into an AST for C, and has the C compiler parse that again to output assembly.
Not a bad language, I much prefer it over Java.
The syntax abstractions over function pointers include things like classes, closures, events, and cooperatively multitasking "async" methods. And Some aspects of these utilize the mess of macros that is GObject for a runtime, though Vala is capable of compiling code that doesn't use GObject.
Yet these can slow things down as they prevent the CPU from queueing up instructions beyond the function pointer. But this is near-vital for the interaction to be driven by users, not software.