fix checker w.r.t. Dyn.t validation
fix checker w.r.t. Dyn.t validation

discrepancy introduced in commit 400327165edcba667ebb70ebb89052455656b719

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