The form (:include $(SCOPE_ROOT)\foo) requires quoting, but the error
message was cryptic ("Error: undefined symbol include").
Signed-off-by: David Allsopp <david.allsopp@metastack.com>
Extend Ordered_set_lang.Unexpanded.expand to include a mapping function
for the S-expression for each atom. The previous behaviour can be
achieved with ~f:Sexp.Of_sexp.string, but this allows the S-expression
to be parsed using String_with_vars.t, thus allowing variable expansion.
Rudi Grinberg
David Allsopp
Jérémie Dimino
Jeremie Dimino