val eval : ?context:Context.t ‑> ?capture:bool ‑> 'a t ‑> ('a, exn) Pervasives.result * Shexp_sexp.Std.Sexp.tProduce a full execution trace.
If capture is true, then anything printed on the original stdout/stderr is
captured and becomes part of the trace.
val eval_exn : ?context:Context.t ‑> ?capture:bool ‑> 'a t ‑> 'a * Shexp_sexp.Std.Sexp.t