On Wed, Oct 2, 2019 at 12:06 AM Richard Copley <rcopley@gmail.com> wrote:

> On continuing in the debugger, it prints "forward-sexp: Searching for program: Permission denied, xyzzy" in the *Messages* buffer.

With that very same revision, just bootstrapped a few minutes ago, and with your recipe, I get

forward-sexp: Searching for program: No such file or directory, xyzzy

This is on Windows 10, with a MSYS2 64-bit build.