Unable to parse C-style encoded strings: $'foo'

[cspotcode]

https://runkit.com/cspotcode/5d6dbd91909e38001b72c4b7

bash can encode string literals like this: $'foo'

For example, printf %q foo$'\n'bar will choose to encode in this style: $'foo\nbar'

bash-parser doesn't seem to parse this.