Optimize Is_accu a bit.
Optimize Is_accu a bit.

gares/coq,ejgallego/coq,SkySkimmer/coq,JasonGross/coq,ejgallego/coq,SkySkimmer/coq,ejgallego/coq,silene/coq,Zimmi48/coq,JasonGross/coq,JasonGross/coq,SkySkimmer/coq,gares/coq,JasonGross/coq,coq/coq,Zimmi48/coq,silene/coq,gares/coq,silene/coq,Zimmi48/coq,coq/coq,SkySkimmer/coq,Zimmi48/coq,gares/coq,gares/coq,coq/coq,ejgallego/coq,coq/coq