From 91c05426338c649175404f9f6a1fc4899cea700a Mon Sep 17 00:00:00 2001
From: Tim Holy <tim.holy@gmail.com>
Date: Fri, 10 Jan 2020 08:57:03 -0600
Subject: [PATCH] Add type parameter to PostOrderDFS

---
 src/AbstractTrees.jl | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/AbstractTrees.jl b/src/AbstractTrees.jl
index 987ccf7..96f8456 100644
--- a/src/AbstractTrees.jl
+++ b/src/AbstractTrees.jl
@@ -318,12 +318,11 @@ Any[1,Any[2,3]]
 
 we will get [1,2,3,Any[2,3],Any[1,Any[2,3]]]
 """
-struct PostOrderDFS <: TreeIterator{Any}
-    tree::Any
-    PostOrderDFS(x::Any) = new(x)
+struct PostOrderDFS{T} <: TreeIterator{T}
+    tree::T
 end
 PostOrderDFS(tree::Tree) = PostOrderDFS(tree.x)
-IteratorSize(::Type{PostOrderDFS}) = SizeUnknown()
+IteratorSize(::Type{PostOrderDFS{T}}) where T = SizeUnknown()
 
 """
 Iterator to visit the nodes of a tree, guaranteeing that parents