[pp] Fix bugs 5651 [incorrect thunk in pretty printer]
[pp] Fix bugs 5651 [incorrect thunk in pretty printer]

Fix bug introduced by a Haskell programmer.

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