Update ModelingToolkit.jl

Author: ChrisRackauckas

src/ModelingToolkit.jl

@@ -10,6 +10,7 @@ abstract type AbstractOperator <: Expression end
 abstract type AbstractSystem end
 abstract type AbstractDomain end
 
+include("domains.jl")
 include("variables.jl")
 
 Base.promote_rule(::Type{T},::Type{T2}) where {T<:Number,T2<:Expression} = Expression
@@ -24,7 +25,6 @@ include("systems/diffeqs/diffeqsystem.jl")
 include("systems/diffeqs/first_order_transform.jl")
 include("systems/nonlinear/nonlinear_system.jl")
 include("function_registration.jl")
-include("domains.jl")
 include("simplify.jl")
 include("utils.jl")