Unbreak RecTutorial.v
Unbreak RecTutorial.v

The RecTutorial.tex still contains similarly broken Coq code, it just
doesn't run it.

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