---input---
f'{{{4*10}}}'

---tokens---
'f'           Literal.String.Affix
"'"           Literal.String.Single
'{{'          Literal.String.Escape
'{'           Literal.String.Interpol
'4'           Literal.Number.Integer
'*'           Operator
'10'          Literal.Number.Integer
'}'           Literal.String.Interpol
'}}'          Literal.String.Escape
"'"           Literal.String.Single
'\n'          Text.Whitespace