Add a test for bug #16402.
Add a test for bug #16402.

SkySkimmer/coq,Zimmi48/coq,coq/coq,ejgallego/coq,Zimmi48/coq,SkySkimmer/coq,Zimmi48/coq,ejgallego/coq,ejgallego/coq,ejgallego/coq,coq/coq,SkySkimmer/coq,SkySkimmer/coq,Zimmi48/coq,coq/coq,coq/coq