Fix variable bounds passed as Rational{Int}(Inf) (#2896)

Author: odow

src/variables.jl

@@ -138,7 +138,7 @@ struct VariableInfo{S,T,U,V}
         if has_fix && !_isfinite(fixed_value)
             error("Unable to fix variable to $(fixed_value)")
         end
-        return new{S,T,U,V}(
+        return new{typeof(lower_bound),typeof(upper_bound),U,V}(
             has_lb,
             lower_bound,
             has_ub,

test/variable.jl

@@ -1025,6 +1025,15 @@ function test_Model_error_messages(::Any, ::Any)
     return
 end
 
+function test_rational_inf_bounds(ModelType, ::Any)
+    model = ModelType()
+    u = Rational{Int}(Inf)
+    @variable(model, -u <= x <= u)
+    @test has_lower_bound(x) == false
+    @test has_upper_bound(x) == false
+    return
+end
+
 function runtests()
     for name in names(@__MODULE__; all = true)
         if !startswith("$(name)", "test_")