Hangs if call to consr gets uncommented

ft.jl

abstract FingerTree{T}

immutable Node23{T}
    child::NTuple{Any, T}
end
Node23{T}(a::T...) = Node23{T}(a)

immutable DeepFT{T} <: FingerTree{T}
    left::NTuple{Any, T}
    succ::Union(FingerTree{Node23{T}},(),Node23{T})
    right::NTuple{Any, T}
end
DeepFT{T}(l::NTuple{Any,T}, s, r::NTuple{Any,T}) = DeepFT{T}(l, s, r)

consr(f::(), a) = tuple(a)
consr{T}(f::NTuple{1,T}, a) = DeepFT(f, (), (a,))

function consr2(ft::DeepFT, a)
	if length(ft.right) < 4
	        DeepFT(ft.left, ft.succ, tuple(ft.right..., a))
	else        
	end
end
consr2(ft,a) = consr(ft,a)

function consr(ft::DeepFT, a)
	if length(ft.right) < 4
	        DeepFT(ft.left, ft.succ, tuple(ft.right..., a))
	else       
		if nevermindwhatishere
		        f = (Node23(ft.right[1:3]...))
# The following breaks
		        DeepFT(ft.left, consr(ft.succ, f)..., tuple(a, ft.right[4]))	
# The following works until ERROR: nevermindwhatishere not defined
#		        DeepFT(ft.left, consr2(ft.succ, f)..., tuple(a, ft.right[4]))
		end
	end
end

# Illustration: Construct a tree and deconstruct it

ft = ()

for i in 'A':'G'
    ft = consr(ft,i)
    println(ft)
end