That'd cause a warning for variable shadowing wouldn't it? We should be able to do:

```Ruby
@args = args.map do |arg|
  arg.
    sub("default_path", "default-path").
    sub("line_number",  "line-number")
end
```

or prehaps

```Ruby
@args = args.map { |arg| arg.
  sub("default_path", "default-path").
  sub("line_number",  "line-number")
}
```