Add a test for a complex conversion involving pattern-matching with let-bindings.
Add a test for a complex conversion involving pattern-matching with let-bindings.

coq/coq,JasonGross/coq,JasonGross/coq,silene/coq,silene/coq,Zimmi48/coq,ejgallego/coq,Zimmi48/coq,SkySkimmer/coq,Zimmi48/coq,silene/coq,coq/coq,ejgallego/coq,coq/coq,coq/coq,SkySkimmer/coq,JasonGross/coq,Zimmi48/coq,SkySkimmer/coq,ejgallego/coq,ejgallego/coq,JasonGross/coq,SkySkimmer/coq