EA-35501 fixed (checkBackingField assert)

compiler/testData/diagnostics/tests/incompleteCode/diagnosticWithSyntaxError/checkBackingFieldException.jet

@@ -0,0 +1,17 @@
+package h
+
+class Square() {
+  var size : Double =
+  <!UNRESOLVED_REFERENCE!>set<!>(<!UNRESOLVED_REFERENCE!>value<!>) {
+    $area = size * size
+  }
+
+  <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>var area : Double<!>
+  private set
+}
+
+fun main(args : Array<String>) {
+  val s = Square()
+
+  s.size = 2.0
+}