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-rw-r--r--src/buildstream/exceptions.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/buildstream/exceptions.py b/src/buildstream/exceptions.py
index 2c455be84..e77d64fe7 100644
--- a/src/buildstream/exceptions.py
+++ b/src/buildstream/exceptions.py
@@ -142,3 +142,6 @@ class LoadErrorReason(Enum):
LINK_FORBIDDEN_DEPENDENCIES = 25
"""A link element declared dependencies"""
+
+ CIRCULAR_REFERENCE = 26
+ """A circular element reference was detected"""