From 5ce3e7b2f7602111614275e0ca27e051257f2616 Mon Sep 17 00:00:00 2001
From: Oscar Dowson <odow@users.noreply.github.com>
Date: Mon, 15 Apr 2024 14:00:57 +1200
Subject: [PATCH] Add missing promote_operation method (#3730)

---
 src/mutable_arithmetics.jl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/mutable_arithmetics.jl b/src/mutable_arithmetics.jl
index c3c47363332..cbfb48a27be 100644
--- a/src/mutable_arithmetics.jl
+++ b/src/mutable_arithmetics.jl
@@ -133,6 +133,14 @@ function _MA.promote_operation(
     return GenericQuadExpr{T,V}
 end
 
+function _MA.promote_operation(
+    ::typeof(*),
+    ::Type{GenericAffExpr{T,V}},
+    ::Type{GenericAffExpr{S,V}},
+) where {T,S,V<:AbstractVariableRef}
+    return GenericQuadExpr{_MA.promote_operation(*, T, S),V}
+end
+
 function _MA.isequal_canonical(x::T, y::T) where {T<:AbstractJuMPScalar}
     return isequal_canonical(x, y)
 end