If a line is introduced solely to contain markup, then that line should be removed from the resulting output. For example, intuitively it looks like the below snippet should translate to a single line: "Hello, world!".

```
// @start
    Hello, World!
// @end
```

There are some corner cases, which we need to think about. For example, what if such a line introduces something to the output?

```
// @replace regex=".*" replacement="Hello, World!"
```

Perhaps, in this case the line should contain something other than markup to begin with:

```
; // @replace regex=";" replacement="Hello, World!"
```