const ref type as return value

[Oleg B]

[code]
import std.stdio;

struct A { int val; }

A a;

class X { const ref A func() { return a; } }

void main()
{
     auto x = new X;
     x.func().val = 5;
     writeln( a );
}
[/code]

in this case 'const' mean 'const method' and variable 'a' changed.

if write
[code]
class X { const(ref A) func() { return a; } }
[/code]

$ dmd -run crtr.d
crtr.d(7): Error: basic type expected, not ref
crtr.d(7): Error: found 'ref' when expecting ')'
crtr.d(7): Error: semicolon expected, not ')'
crtr.d(7): Error: Declaration expected, not ')'
crtr.d(7): Error: unrecognized declaration

Only one way I find for workaround this
[code]
alias const ref A crA;
class X { crA func() { return a; } }
[/code]

But I think should exist more elegant solution.