Fix bug #3887: Better error message for "More than one program with unsolved obligations".
Fix bug #3887: Better error message for "More than one program with unsolved obligations".

gares/coq,ejgallego/coq,letouzey/coq-wip,maximedenes/coq,ejgallego/coq,ppedrot/coq,maximedenes/coq,silene/coq,ppedrot/coq,mattam82/coq,amintimany/coq,letouzey/coq-wip,maximedenes/coq,ejgallego/coq,ejgallego/coq,gares/coq,Matafou/coq,ppedrot/coq,william-lawvere/coq,coq/coq,Lionel-Rieg/coq,amintimany/coq,maximedenes/coq,gares/coq,mattam82/coq,JasonGross/coq,ppedrot/coq,coq/coq,Ptival/coq,amintimany/coq,gares/coq,Lionel-Rieg/coq,SkySkimmer/coq,Zimmi48/coq,gares/coq,coq/coq,letouzey/coq-wip,letouzey/coq-wip,SkySkimmer/coq,letouzey/coq-wip,william-lawvere/coq,ppedrot/coq,silene/coq,Ptival/coq,maximedenes/coq,Matafou/coq,Zimmi48/coq,Zimmi48/coq,JasonGross/coq,Lionel-Rieg/coq,JasonGross/coq,mattam82/coq,Zimmi48/coq,JasonGross/coq,william-lawvere/coq,SkySkimmer/coq,Matafou/coq,Ptival/coq,coq/coq,silene/coq,SkySkimmer/coq