---input---
f'{ chr(65) =}'

---tokens---
'f'           Literal.String.Affix
"'"           Literal.String.Single
'{'           Literal.String.Interpol
' '           Text.Whitespace
'chr'         Name.Builtin
'('           Punctuation
'65'          Literal.Number.Integer
')'           Punctuation
' '           Text.Whitespace
'=}'          Literal.String.Interpol
"'"           Literal.String.Single
'\n'          Text.Whitespace