New v0.4 features.

conv.jl

type Foo
    x
    Foo(x::Int) = new(x)
end

Base.convert(::Type{Foo}, x::Integer) = Foo(convert(Int, x))

@show Foo(1)     # ok both on v0.3 and v0.4
@show Foo(0x01)  # ok on v0.4, but not on v0.3

point.jl

"""
Point type.

This is a type to represent a point in 3D Cartesian coordinate system.

Fields:

* `x`: coordinate of X axis.
* `y`: coordinate of Y axis.
* `z`: coordinate of Z axis.
"""
type Point
    x::Float64
    y::Float64
    z::Float64
end


"Enclidean distance from the origin."
function distance(p::Point)
    sqrt(p.x^2 + p.y^2 + p.z^2)
end