Initially I thought they didn't need to be styled since the variable that came before them would be styled, but they can occur on their own too (eg `s"$someMethod"`).
I've changed the code to style the first identifier in each expression, so in `s"$someMethod $someVal ${someVal2.method1().method2().method3()}"` the identifiers that would be styled are `someMethod`, `someVal`, and `someVal2` (I think it would be superfluous to style every identifier).