Handle string import files during upwards inheritance. Fixes #331.
Handle string import files during upwards inheritance. Fixes #331.

p0nce/dub,Flamaros/dub,schuetzm/dub,Abscissa/dub-data-mod,Abscissa/dub,jeanbaptistelab/dub,D-Programming-Language/dub,dreamsxin/dub,y12uc231/dub,gedaiu/dub,nazriel/dub,alexeibs/dub,grogancolin/dub,rjframe/dub,Geod24/dub,xentec/dub,jelmansouri/dub