---input---
"first line\nsecond\tline"

---tokens---
'"'           Literal.String
'first line'  Literal.String
'\\n'         Literal.String.Escape
'second'      Literal.String
'\\t'         Literal.String.Escape
'line'        Literal.String
'"'           Literal.String
'\n'          Text.Whitespace