---input---
f"{i}:{d[i]}"

---tokens---
'f'           Literal.String.Affix
'"'           Literal.String.Double
'{'           Literal.String.Interpol
'i'           Name
'}'           Literal.String.Interpol
':'           Literal.String.Double
'{'           Literal.String.Interpol
'd'           Name
'['           Punctuation
'i'           Name
']'           Punctuation
'}'           Literal.String.Interpol
'"'           Literal.String.Double
'\n'          Text.Whitespace