# SyntaxError: f-string expression part cannot include a backslash

---input---
f"{\"quoted string\"}"

---tokens---
'f'           Literal.String.Affix
'"'           Literal.String.Double
'{'           Literal.String.Interpol
'\\'          Error
'"'           Literal.String.Double
'quoted string' Literal.String.Double
'\\"'         Literal.String.Escape
'}'           Literal.String.Double
'"'           Literal.String.Double
'\n'          Text
