Fix model_convert for BridgeableConstraint (#3437)

src/macros.jl

@@ -923,7 +923,8 @@ end
 function model_convert(model::AbstractModel, con::BridgeableConstraint)
     return BridgeableConstraint(
         model_convert(model, con.constraint),
-        con.bridge_type,
+        con.bridge_type;
+        con.coefficient_type,
     )
 end
 

test/nonnegative_bridge.jl

@@ -17,6 +17,22 @@ struct Nonnegative <: MOI.AbstractScalarSet end
 
 MOI.copy(set::Nonnegative) = set
 
+struct BridgeMe{T,S}
+    set::S
+end
+
+function JuMP.build_constraint(
+    error::Function,
+    f,
+    set::BridgeMe{T,Nonnegative},
+) where {T}
+    return BridgeableConstraint(
+        JuMP.build_constraint(error, f, set.set),
+        NonnegativeBridge;
+        coefficient_type = T,
+    )
+end
+
 """
     NonnegativeBridge{T}
 

test/test_model.jl

@@ -421,6 +421,13 @@ function test_bridges_add_bridgeable_con_model_optimizer()
     @test 2.0 == @inferred dual(c)
 end
 
+function test_macro_bridgeable()
+    model = Model()
+    @variable(model, x)
+    @constraint(model, x in BridgeMe{Int,Nonnegative}(Nonnegative()))
+    @test NonnegativeBridge{Int} in model.bridge_types
+end
+
 function test_bridges_add_bridgeable_con_set_optimizer()
     model = Model()
     @variable(model, x)