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-rw-r--r--src/interp/sys-utility.boot3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/interp/sys-utility.boot b/src/interp/sys-utility.boot
index d34cc4b8..3fcbdf9c 100644
--- a/src/interp/sys-utility.boot
+++ b/src/interp/sys-utility.boot
@@ -40,6 +40,9 @@ namespace BOOT
--%
$COMBLOCKLIST := nil
+++ No value marker for the Maybe domain.
+%nothing == KEYWORD::%OpenAxiomNoValue
+
--%