Have a look at those links:

On Thu, 2014-06-12 at 18:28, [email protected] wrote:
> Both C++ and Fortran 90 allow the programmer to annotate call-by-reference 
> arguments to a function as to whether the function is allowed to change 
> them (this is denoted  const & in C++).  The compiler then enforces the 
> const-ness of the argument.  I don't see how to do this in Julia.  Is it 
> available?  If not, is there a reason why it was not included?  This is a 
> fairly basic tool for self-documenting code and for ensuring program 
> correctness.

https://groups.google.com/d/msg/julia-users/qJa2EyUXJfo/gVtFJKkHv4AJ

> And a related question: the documentation makes a big deal about "stable 
> types" for function return arguments.  An obvious question is why the 
> language doesn't allow the programmer to declare in the function heading 
> what will be the return types of the function, and then have the compiler 
> enforce this stability.  Is this possible in Julia?  If not, is there a 
> technical reason for omitting it?

https://github.com/JuliaLang/julia/issues/1090

> P.S. I have a few more questions but I'll pause now to wait for answers to 
> these questions.  I hope they are easy to answer!

Searching the issues on 
https://github.com/JuliaLang/julia
may answer some of them.

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