std/srfi/78: use @match:prefix annotation      This is a pathological pattern that causes the match optimizer to blow up, so add an annotation to limit it to prefix matching.
std/srfi/78: use @match:prefix annotation
    
This is a pathological pattern that causes the match optimizer to blow up,
so add an annotation to limit it to prefix matching.

vyzo/gerbil,vyzo/gerbil,vyzo/gerbil