[julia-users] Problem with Abstract Types in Type definition

[Christopher Alexander]

Hello all,

I am trying to figure out what I'm doing wrong with the creation of a 
composite type, as below:

abstract MyType

type MySpecificType <: MyType

type TestTypes
        type_test::MyType
end

testing = MySpecificType

x = TestTypes(testing)


After running the above, I get a MethodError: 

ERROR: MethodError: `convert` has no method matching 
convert(::Type{MyType}, ::Type{MySpecificType})
This may have arisen from a call to the constructor MyType(...),
since type constructors fall back to convert methods.
Closest candidates are:
  call{T}(::Type{T}, ::Any)
  convert{T}(::Type{T}, ::T)
 in call at none:2

Any ideas?

Thanks!

Chris