Hide default constructor for a struct

General Usage
2

You can certainly replace the default constructor by a custom one. But dropping it without any replacement isn’t particularly useful, is it? If there is no constructor at all, what do you need the struct for (you will never be able to create objects)?

julia> struct A
           x::Float64
           A() = new(1.23)
       end

julia> A() # custom constructor
A(1.23)

julia> A(3.141) # default constructor isn't defined
ERROR: MethodError: no method matching A(::Float64)
Closest candidates are:
  A() at REPL[1]:3
Stacktrace:
 [1] top-level scope
   @ REPL[3]:1