When compiling the following code:
----
char[] replace(char[] subject)
{
    auto app = Appender();

    app.data.ptr[0..subject.length] = subject;
    return app.data;
}

struct Appender
{
    char[] data;
}
enum foo = replace("$a = ?".dup);
----
With dmd 2.058, dmd gives the following:
----
$ dmd test.d 
test.d(5): Error: pointer cast from char[] to char* is not supported at compile time
Segmentation fault: 11
----