Is this an rvalue reference problem?

Gary Willoughby via Digitalmars-d-learn digitalmars-d-learn at
Sun Dec 27 08:05:39 PST 2015

See the following code:

import std.stdio;

void foo(ref int x)
	writefln("%s", x);

void main(string[] args)
	int y = 0;

When compiled it produces this error:

test.d(11): Error: function (ref int x) is not callable 
using argument types (int)

If I remove the post-increment of the y variable if works. Is 
this an rvalue reference issue? Would you expect this to work? 
Should the error message be a little more helpful?

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