The test file:

    class C { @property int get() { return 0; } }
    void main() {}

Generates the header:

    // D import file generated from 'hdrgen.d'
    class C
    {
        property 
    {
        int get()
    {
    return 0;
    }
    }
    }
    void main()
    {
    }

With the '@' missing the header is invalid.  This is currently blocking the use of these attributes in druntime.  I've attached a patch that fixes the issue, but there's likely a better way to do it.