[kernel] Improve proof using message, fixes bugzilla #3613
[kernel] Improve proof using message, fixes bugzilla #3613

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