'const' and 'in' parameter storage classes

[Steven Schveighoffer via Digitalmars-d-learn]

On 5/15/15 12:04 PM, ref2401 wrote:
> What is the difference between 'const' and 'in' parameter storage classes?
> When should I use 'const' or 'in'?
>
> The documentation says 'in' is the same as 'const scope' but I can't
> write 'const scope ref' though it's legal to write 'in ref'.

scope ref const

-Steve