Found while working on std.regex. std.array.Append will sometimes fail with that message.

Simpified test case:

bool empty(int[] arr)
{
    return arr.length == 0;
}

struct Appender
{
    private struct Data
    {
        size_t capacity;
        int[] arr;
    }

    private Data* _data;

    @property int[] data()  @trusted pure nothrow
    {
        return (_data ? _data.arr : null);
    }
}

struct Stack
{
    Appender stack;  
    @property bool empty(){ return stack.data.empty; }
}


bool foo()
{
    Stack app;
    return app.empty;
}


pragma(msg, foo());

Outputs (tested with git HEAD 2.064):

ctfe_fail.d(18): Error: *this._data.arr is not yet implemented at compile time
ctfe_fail.d(25):        called from here: this.stack.data()
ctfe_fail.d(25):        called from here: empty(this.stack.data())
ctfe_fail.d(32):        called from here: app.empty()
ctfe_fail.d(36):        called from here: foo()
ctfe_fail.d(36):        while evaluating pragma(msg, foo())