No blank lines in inline interpreted roles:

```
% pandoc -f rst -t native
`no

blank`:myrole:
^D
[ Para [ Str "`no" ] , Para [ Str "blank`:myrole:" ] ]
```

Backslash escape behaves properly in interpreted roles:

```
% pandoc -f rst -t native
`hi\ there`:sup:

`hi\ there`:code:
^D
[ Para [ Superscript [ Str "hithere" ] ]
, Para [ Code ( "" , [] , [] ) "hi\\ there" ]
]
```

Backtick followed by alphanumeric doesn't end the span:
```
% pandoc -f rst -t native
`hi`there`:myrole:
^D
[ Para
    [ Code
        ( "" , [ "interpreted-text" ] , [ ( "role" , "myrole" ) ] )
        "hi`there"
    ]
]
```

Newline is okay, as long as not blank:
```
% pandoc -f rst -t native
`hi
there`:myrole:
^D
[ Para
    [ Code
        ( "" , [ "interpreted-text" ] , [ ( "role" , "myrole" ) ] )
        "hi\nthere"
    ]
]
```

Use span for title-reference:
```
% pandoc -f rst -t native
`default`
^D
[ Para
    [ Span ( "" , [ "title-ref" ] , [] ) [ Str "default" ] ]
]
```
