fact: Definition to_string {T} {M : Show T} (v : T) : string := runShow (show v) ""%string.
imports: Coq.Strings.String Coq.Program.Wf Coq.PArith.BinPos Coq.ZArith.ZArith ExtLib.Structures.Monoid ExtLib.Structures.Reducible ExtLib.Programming.Injection ExtLib.Data.Char ExtLib.Data.String ExtLib.Data.Fun ExtLib.Core.RelDec