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-rw-r--r--src/Language/Fiddle/Compiler/Expansion.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/Language/Fiddle/Compiler/Expansion.hs b/src/Language/Fiddle/Compiler/Expansion.hs
index d9bce1e..0443b8d 100644
--- a/src/Language/Fiddle/Compiler/Expansion.hs
+++ b/src/Language/Fiddle/Compiler/Expansion.hs
@@ -71,6 +71,8 @@ deriving instance AdvanceStage CurrentStage BitType
deriving instance AdvanceStage CurrentStage EnumBody
+deriving instance AdvanceStage CurrentStage (ConstExpression u)
+
deriving instance AdvanceStage CurrentStage EnumConstantDecl
deriving instance (AdvanceStage CurrentStage t) => AdvanceStage CurrentStage (Directed t)