[m-rev.] diff: check bootstrap compiler supports type_is_abstract_enum

[Peter Wang]

Sorry.

Branches: main

configure.in:
	Fix check for `where type_is_abstract_enum'.

diff --git a/configure.in b/configure.in
index 729fab2..e98bb5c 100644
--- a/configure.in
+++ b/configure.in
@@ -302,6 +302,7 @@ then
             [[untrailed, attach_to_io_state, thread_local]]
         ).
 
+        :- type abs_enum ---> yes ; no.
         :- type abs_enum where type_is_abstract_enum(1).
 
         main(!IO) :-
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