Revert "Revert "Protect printing of intro-patterns from collision when "[|" or"
Revert "Revert "Protect printing of intro-patterns from collision when "[|" or"

This reverts commit fd8669f9f2e37607f5eba56ba25e267711876e62.

Ptival/coq,silene/coq,letouzey/coq-wip,ejgallego/coq,ppedrot/coq,ejgallego/coq,SkySkimmer/coq,Matafou/coq,gares/coq,JasonGross/coq,SkySkimmer/coq,Zimmi48/coq,Matafou/coq,SkySkimmer/coq,silene/coq,Zimmi48/coq,amintimany/coq,Zimmi48/coq,gares/coq,JasonGross/coq,maximedenes/coq,ppedrot/coq,Lionel-Rieg/coq,letouzey/coq-wip,maximedenes/coq,Lionel-Rieg/coq,SkySkimmer/coq,ppedrot/coq,silene/coq,maximedenes/coq,Ptival/coq,mattam82/coq,Matafou/coq,ejgallego/coq,coq/coq,gares/coq,Ptival/coq,maximedenes/coq,coq/coq,gares/coq,letouzey/coq-wip,letouzey/coq-wip,ppedrot/coq,mattam82/coq,letouzey/coq-wip,coq/coq,gares/coq,ppedrot/coq,william-lawvere/coq,william-lawvere/coq,JasonGross/coq,Lionel-Rieg/coq,maximedenes/coq,mattam82/coq,JasonGross/coq,william-lawvere/coq,Zimmi48/coq,coq/coq,amintimany/coq,ejgallego/coq,amintimany/coq