These are not line continuations. They either should be taken literally,
or allow the word array to contain the following whitespace (newlines in this case)

Before:
```
  0...1: tSTRING_BEG     => "'"
 1...12: tSTRING_CONTENT => "foobar\\\n"
12...16: tSTRING_CONTENT => "baz\n"
16...17: tSTRING_END     => "'"
17...18: tNL             => nil
```

After:
```
  0...1: tSTRING_BEG     => "'"
  1...6: tSTRING_CONTENT => "foo\\\n"
 6...12: tSTRING_CONTENT => "bar\\\n"
12...16: tSTRING_CONTENT => "baz\n"
16...17: tSTRING_END     => "'"
17...18: tNL             => nil
```

https://github.com/ruby/prism/commit/b6554ad64e