Better error message when defining recursive records with Record or Structure.
Better error message when defining recursive records with Record or
Structure.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@15159 85f007b7-540e-0410-9357-904b9bb8a0f7

TOSPIO/coq,Matafou/coq,pirapira/coq2rust,gares/coq,JasonGross/coq,gmalecha/coq,letouzey/coq-wip,gmalecha/coq,ppedrot/coq,gares/coq,gares/coq,mlasson/coq,asr/coq,Lionel-Rieg/coq,ale-f/coq,coq/coq,Lionel-Rieg/coq,barras/coq,maximedenes/coq,ale-f/coq,coq/coq,maximedenes/coq,8l/coq,herbelin/github-coq,maximedenes/coq,maximedenes/coq,shindere/coq,aspiwack/coq,SkySkimmer/coq,SkySkimmer/coq,JasonGross/coq,mattam82/coq,Ptival/coq,jpdeplaix/coq,ppedrot/coq,jhjourdan/coq,william-lawvere/coq,coq/coq,william-lawvere/coq,TOSPIO/coq,ejgallego/coq,barras/coq,TheTypoMaster/coq,TheTypoMaster/coq,pirbo/coq,gmalecha/coq,JasonGross/coq,ejgallego/coq,8l/coq,8l/coq,jhjourdan/coq,mlasson/coq,Ptival/coq,ale-f/coq,amintimany/coq,Zimmi48/coq,letouzey/coq-wip,mattam82/coq,TOSPIO/coq,ppedrot/coq,Ptival/coq,shindere/coq,shindere/coq,ejgallego/coq,ppedrot/coq,Lionel-Rieg/coq,ejgallego/coq,letouzey/coq-wip,gares/coq,JasonGross/coq,Zimmi48/coq,pirbo/coq,asr/coq,jpdeplaix/coq,SkySkimmer/coq,mlasson/coq,letouzey/coq-wip,ppedrot/coq,letouzey/coq-wip,amintimany/coq,pirapira/coq2rust,asr/coq,Matafou/coq,william-lawvere/coq,silene/coq,herbelin/github-coq,TheTypoMaster/coq,coq/coq,SkySkimmer/coq,jpdeplaix/coq,barras/coq,Matafou/coq,mattam82/coq,aspiwack/coq,aspiwack/coq,maximedenes/coq,silene/coq,herbelin/github-coq,pirbo/coq,Zimmi48/coq,pirapira/coq2rust,Zimmi48/coq,jhjourdan/coq,silene/coq,amintimany/coq,gares/coq