Catch-all aliases working again

[hcoop/domtool2.git] / src / env.sml

diff --git a/src/env.sml b/src/env.sml
index f87278f..edb1ffd 100644 (file)
--- a/src/env.sml
+++ b/src/env.sml
@@ -170,7 +170,9 @@ fun env arg (evs, name) =
        NONE => raise Fail ("Unavailable environment variable " ^ name)
       | SOME e =>
        case arg e of
-           NONE => raise Fail ("Bad format for environment variable " ^ name)
+           NONE => (Print.preface ("Unexpected value for " ^ name ^ ":",
+                                   Print.p_exp e);
+                    raise Fail ("Bad format for environment variable " ^ name))
          | SOME v => v
 
 fun type_one func arg f =