Removing unneeded concretetypes as well

Author: theogf

src/generic.jl

@@ -5,11 +5,5 @@ Base.iterate(k::Kernel, ::Any) = nothing
 
 printshifted(io::IO, o, shift::Int) = print(io, o)
 
-### Syntactic sugar for creating matrices and using kernel functions
-function concretetypes(k, ktypes::Vector)
-    isempty(subtypes(k)) ? push!(ktypes, k) : concretetypes.(subtypes(k), Ref(ktypes))
-    return ktypes
-end
-
 # Fallback implementation of evaluate for `SimpleKernel`s.
 (k::SimpleKernel)(x, y) = kappa(k, evaluate(metric(k), x, y))