Fix

Author: blegat

src/Utilities/objective_container.jl

@@ -116,7 +116,7 @@ function MOI.supports(
     return true
 end
 
-struct UnsafeObjectiveFunction{F<:MOI.AbstractFunction} end
+struct UnsafeObjectiveFunction{F<:MOI.AbstractFunction} <: MOI.AbstractModelAttribute end
 
 function MOI.get(model::MOI.ModelLike, ::UnsafeObjectiveFunction{F}) where {F}
     return MOI.get(model, MOI.ObjectiveFunction{F}())

src/Utilities/universalfallback.jl

@@ -534,7 +534,7 @@ end
 
 function MOI.get(
     uf::UniversalFallback,
-    attr::MOI.ObjectiveFunction{F},
+    attr::Union{MOI.UnsafeObjectiveFunction{F},MOI.ObjectiveFunction{F}},
 )::F where {F}
     if uf.objective === nothing
         return MOI.get(uf.model, attr)
@@ -866,7 +866,7 @@ end
 
 function MOI.get(
     uf::UniversalFallback,
-    attr::Union{MOI.ConstraintFunction,MOI.ConstraintSet},
+    attr::Union{MOI.UnsafeConstraintFunction,MOI.ConstraintFunction,MOI.ConstraintSet},
     ci::MOI.ConstraintIndex,
 )
     return MOI.get(constraints(uf, ci), attr, ci)

src/Utilities/vector_of_constraints.jl

@@ -96,7 +96,7 @@ function MOI.delete(
     return
 end
 
-struct UnsafeConstraintFunction end
+struct UnsafeConstraintFunction <: MOI.AbstractConstraintAttribute end
 
 function MOI.get_fallback(
     model::MOI.ModelLike,