---input---
f"Hello {name}!"

---tokens---
'f'           Literal.String.Affix
'"'           Literal.String.Double
'Hello '      Literal.String.Double
'{'           Literal.String.Interpol
'name'        Name.Variable
'}'           Literal.String.Interpol
'!'           Literal.String.Double
'"'           Literal.String.Double
'\n'          Text.Whitespace