Fix warning when using Variables at toplevel.
Fix warning when using Variables at toplevel.

ejgallego/coq,Lionel-Rieg/coq,ppedrot/coq,SkySkimmer/coq,ppedrot/coq,maximedenes/coq,SkySkimmer/coq,ppedrot/coq,Lionel-Rieg/coq,gares/coq,SkySkimmer/coq,coq/coq,silene/coq,Zimmi48/coq,JasonGross/coq,maximedenes/coq,Lionel-Rieg/coq,gares/coq,Zimmi48/coq,ejgallego/coq,william-lawvere/coq,gares/coq,letouzey/coq-wip,maximedenes/coq,Ptival/coq,JasonGross/coq,silene/coq,JasonGross/coq,coq/coq,Ptival/coq,maximedenes/coq,letouzey/coq-wip,gares/coq,maximedenes/coq,ppedrot/coq,amintimany/coq,letouzey/coq-wip,Matafou/coq,JasonGross/coq,ppedrot/coq,silene/coq,william-lawvere/coq,ejgallego/coq,coq/coq,ejgallego/coq,gares/coq,Zimmi48/coq,Zimmi48/coq,Matafou/coq,letouzey/coq-wip,william-lawvere/coq,letouzey/coq-wip,Matafou/coq,Ptival/coq,SkySkimmer/coq,amintimany/coq,coq/coq,amintimany/coq