---input---
f'My name is {name}, my age next year is {age+1}, my anniversary is {anniversary:%A, %B %d, %Y}.'

---tokens---
'f'           Literal.String.Affix
"'"           Literal.String.Single
'My name is ' Literal.String.Single
'{'           Literal.String.Interpol
'name'        Name
'}'           Literal.String.Interpol
', my age next year is ' Literal.String.Single
'{'           Literal.String.Interpol
'age'         Name
'+'           Operator
'1'           Literal.Number.Integer
'}'           Literal.String.Interpol
', my anniversary is ' Literal.String.Single
'{'           Literal.String.Interpol
'anniversary' Name
':'           Literal.String.Interpol
'%A, %B %d, %Y' Literal.String.Single
'}'           Literal.String.Interpol
'.'           Literal.String.Single
"'"           Literal.String.Single
'\n'          Text.Whitespace
