add tests for nested let
add tests for nested let

pocketberserker/FSharp.Quotations.Compiler,bleis-tift/FSharp.Quotations.Compiler,pocketberserker/FSharp.Quotations.Compiler,colinbull/FSharp.Quotations.Compiler,bleis-tift/FSharp.Quotations.Compiler,colinbull/FSharp.Quotations.Compiler