9111: fix: make "extract type alias" place extracted type alias outside of impl r=jonas-schievink a=jonas-schievink bors r+ Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
9111: fix: make "extract type alias" place extracted type alias outside of impl r=jonas-schievink a=jonas-schievink bors r+ Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>