Make const, immutable, inout, and shared illegal as function attributes on the left-hand side of a function

[deadalnix via Digitalmars-d]

On Friday, 10 October 2014 at 02:38:42 UTC, Walter Bright wrote:
> For functions, const-as-storage-class applies to the function 
> symbol. And if it is misused, the compiler will very likely 
> complain about a mismatched type.
> Breaking this adds a special case inconsistency, besides 
> breaking existing code.
>

Come on that is the same bogus reason every time. const here do 
not apply to the function but to its hidden, implicit parameter. 
And that is actually a problem.

const void delegate() dg; // dg should be const, and there is no 
way to qualify the implicit parameter.

You obviously can't pretend you don't know this as:
const int foo() {}

Gives you an error because you have no this pointer to make 
const. So let's not pretend that this const actually qualify the 
function when everybody knows it doesn't.