---input---
val something = "something"
"Here is $something"
"Here is ${something.toUpperList()}"

---tokens---
'val'         Keyword.Declaration
' '           Text.Whitespace
'something'   Name.Variable
' '           Text.Whitespace
'='           Operator
' '           Text.Whitespace
'"'           Literal.String
'something'   Literal.String
'"'           Literal.String
'\n'          Text.Whitespace

'"'           Literal.String
'Here is '    Literal.String
'$'           Literal.String.Interpol
'something'   Name
'"'           Literal.String
'\n'          Text.Whitespace

'"'           Literal.String
'Here is '    Literal.String
'${'          Literal.String.Interpol
'something'   Name
'.'           Punctuation
'toUpperList' Name.Attribute
'('           Punctuation
')'           Punctuation
'}'           Literal.String.Interpol
'"'           Literal.String
'\n'          Text.Whitespace