refactor: move Node{T} into old module

Author: MilesCranmer

src/Expression.jl

@@ -106,7 +106,7 @@ node_type(::Union{E,Type{E}}) where {N,E<:AbstractExpression{<:Any,N}} = N
 function max_degree(::Union{E,Type{E}}) where {E<:AbstractExpression}
     return has_node_type(E) ? max_degree(node_type(E)) : max_degree(NNode)
 end
-@unstable default_node_type(_) = NNode
+@unstable default_node_type(_) = NNode{T,max_degree(NNode)} where {T}
 default_node_type(::Type{N}) where {T,N<:AbstractExpression{T}} = NNode{T,max_degree(N)}
 
 ########################################################

src/Node.jl

@@ -435,4 +435,10 @@ function set_node!(tree::AbstractExpressionNNode, new_tree::AbstractExpressionNN
     return nothing
 end
 
+# Old types
+const AbstractNode = AbstractNNode{2}
+const AbstractExpressionNode{T} = AbstractExpressionNNode{T,2}
+const Node{T} = NNode{T,2}
+const GraphNode{T} = GraphNNode{T,2}
+
 end

src/ParametricExpression.jl

@@ -503,4 +503,7 @@ function copy_into!(dest::NamedTuple, src::ParametricExpression)
 end
 ###############################################################################
 
+# Old types
+const ParametricNode{T} = ParametricNNode{T,2}
+
 end

src/deprecated.jl

@@ -95,9 +95,3 @@ Base.@deprecate_binding SimplifyEquationModule SimplifyModule
     ),
     set_scalar_constants!(tree, constants, refs)
 )
-
-const AbstractNode = AbstractNNode{2}
-const AbstractExpressionNode{T} = AbstractExpressionNNode{T,2}
-const ParametricNode{T} = ParametricNNode{T,2}
-const Node{T} = NNode{T,2}
-const GraphNode{T} = GraphNNode{T,2}