Fix spurious OCaml Warning 56 in TACTIC EXTEND macros.
Fix spurious OCaml Warning 56 in TACTIC EXTEND macros.

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