Internal error: Unknown element/Invalid record

Hi,
while playing a bit with interpolated string i’ve got this error

ConsoleApplication2 1.bugreport.txt (2.7 KB)
ConsoleApplication2 1.bugreport.zip (2.1 KB)

the IE is a follow-up for:

  var s3; // E1 assignment (:=) expected, got semicolon (;)
          // H10 Local variable "s3" is not used

which _should_not be allowed (which we fixed a while back). I’ll log

Logged as bugs://E26982.