Fix bug introduced by my last commit, forgetting to adjust de Bruijn index lookup.
Fix bug introduced by my last commit, forgetting to adjust de Bruijn
index lookup.

silene/coq,letouzey/coq-wip,barras/coq,herbelin/github-coq,gmalecha/coq,Zimmi48/coq,Lionel-Rieg/coq,ppedrot/coq,SkySkimmer/coq,ale-f/coq,Zimmi48/coq,maximedenes/coq,ejgallego/coq,herbelin/github-coq,TOSPIO/coq,TheTypoMaster/coq,jpdeplaix/coq,TOSPIO/coq,mlasson/coq,amintimany/coq,ejgallego/coq,coq/coq,barras/coq,silene/coq,Matafou/coq,gares/coq,8l/coq,jpdeplaix/coq,SkySkimmer/coq,gares/coq,amintimany/coq,ppedrot/coq,william-lawvere/coq,ejgallego/coq,mlasson/coq,TheTypoMaster/coq,ppedrot/coq,Lionel-Rieg/coq,Matafou/coq,mattam82/coq,mattam82/coq,gmalecha/coq,jpdeplaix/coq,JasonGross/coq,TheTypoMaster/coq,gares/coq,letouzey/coq-wip,JasonGross/coq,ale-f/coq,Zimmi48/coq,Ptival/coq,JasonGross/coq,maximedenes/coq,asr/coq,Lionel-Rieg/coq,william-lawvere/coq,JasonGross/coq,letouzey/coq-wip,coq/coq,william-lawvere/coq,aspiwack/coq,Zimmi48/coq,Ptival/coq,mattam82/coq,amintimany/coq,ejgallego/coq,ale-f/coq,coq/coq,asr/coq,barras/coq,ppedrot/coq,gmalecha/coq,maximedenes/coq,aspiwack/coq,ppedrot/coq,gares/coq,Ptival/coq,gares/coq,maximedenes/coq,SkySkimmer/coq,aspiwack/coq,Matafou/coq,SkySkimmer/coq,letouzey/coq-wip,TOSPIO/coq,mlasson/coq,silene/coq,8l/coq,maximedenes/coq,asr/coq,8l/coq,coq/coq,herbelin/github-coq,letouzey/coq-wip