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-rw-r--r--src/libexpr/nixexpr-ast.def1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr-ast.def b/src/libexpr/nixexpr-ast.def
index 19601847cf32..b384ff7c08fc 100644
--- a/src/libexpr/nixexpr-ast.def
+++ b/src/libexpr/nixexpr-ast.def
@@ -18,6 +18,7 @@ OpUpdate | Expr Expr | Expr |
 SubPath | Expr Expr | Expr |
 OpHasAttr | Expr string | Expr |
 OpPlus | Expr Expr | Expr |
+OpConcat | Expr Expr | Expr |
 Call | Expr Expr | Expr |
 Select | Expr string | Expr |
 Var | string | Expr |