Fixing bug #4347: Not_found Exception with some Records.
Fixing bug #4347: Not_found Exception with some Records.

A term was reduced in an improper environment.

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