Nested Comments in D-Lang Problematic

```
/* 8 lines 5 code 1 comments 2 blanks */

void main() {
    auto x = 5; /+ a /+ nested +/ comment /* +/
    writefln("hello");
    auto y = 4; // */
}
```

Note that in the above `/+` allows nested comments but that */ can be inside the different one. Currently scc is unable to deal with this.