fix #2909 broken rust autocomplete
fix #2909 broken rust autocomplete

danr/kakoune,Somasis/kakoune,danr/kakoune,alexherbo2/kakoune,Somasis/kakoune,alexherbo2/kakoune,occivink/kakoune,lenormf/kakoune,jkonecny12/kakoune,Somasis/kakoune,casimir/kakoune,mawww/kakoune,lenormf/kakoune,danr/kakoune,casimir/kakoune,casimir/kakoune,occivink/kakoune,alexherbo2/kakoune,Somasis/kakoune,mawww/kakoune,jkonecny12/kakoune,mawww/kakoune,jkonecny12/kakoune,danr/kakoune,lenormf/kakoune,casimir/kakoune,mawww/kakoune,alexherbo2/kakoune,jkonecny12/kakoune,occivink/kakoune,lenormf/kakoune,occivink/kakoune