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-rw-r--r--buildstream/_exceptions.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/buildstream/_exceptions.py b/buildstream/_exceptions.py
index a4e3ce69b..fa595852b 100644
--- a/buildstream/_exceptions.py
+++ b/buildstream/_exceptions.py
@@ -219,6 +219,9 @@ class LoadErrorReason(Enum):
# A recursive variable has been encountered
RECURSIVE_VARIABLE = 22
+ # An attempt so set the value of a protected variable
+ PROTECTED_VARIABLE_REDEFINED = 23
+
# LoadError
#