From b7c6cf900f4dba8c4464d5c355ee0559d06afe9b Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <sergei@zimmerman.foo>
Date: Wed, 24 Sep 2025 01:04:26 +0300
Subject: [PATCH] libexpr: Explicitly define `ExprOpUpdate`

---
 src/libexpr/include/nix/expr/nixexpr.hh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/libexpr/include/nix/expr/nixexpr.hh b/src/libexpr/include/nix/expr/nixexpr.hh
index 2682e623b..e04e4f23c 100644
--- a/src/libexpr/include/nix/expr/nixexpr.hh
+++ b/src/libexpr/include/nix/expr/nixexpr.hh
@@ -614,9 +614,13 @@ MakeBinOp(ExprOpNEq, "!=");
 MakeBinOp(ExprOpAnd, "&&");
 MakeBinOp(ExprOpOr, "||");
 MakeBinOp(ExprOpImpl, "->");
-MakeBinOp(ExprOpUpdate, "//");
 MakeBinOp(ExprOpConcatLists, "++");
 
+struct ExprOpUpdate : Expr
+{
+    MakeBinOpMembers(ExprOpUpdate, "//")
+};
+
 struct ExprConcatStrings : Expr
 {
     PosIdx pos;