'AbstractStringBuilder' has package private, so cannot be used in tests

compiler/testData/diagnostics/tests/regressions/DoubleDefine.jet

@@ -9,8 +9,8 @@ fun takeFirst(expr: StringBuilder): Char {
   return c
 }
 
-fun evaluateArg(expr: AbstractStringBuilder, numbers: ArrayList<Int>): Int {
-  if (expr.length() == 0) throw Exception("Syntax error: Character expected");
+fun evaluateArg(expr: CharSequence, numbers: ArrayList<Int>): Int {
+  if (expr.length == 0) throw Exception("Syntax error: Character expected");
   val c = takeFirst(<!TYPE_MISMATCH!>expr<!>)
   if (c >= '0' && c <= '9') {
     val n = c - '0'

idea/testData/checker/regression/DoubleDefine.jet

@@ -8,8 +8,8 @@ fun takeFirst(expr: StringBuilder): Char {
   return c
 }
 
-fun evaluateArg(expr: AbstractStringBuilder, numbers: ArrayList<Int>): Int {
-  if (expr.length() == 0) throw Exception("Syntax error: Character expected");
+fun evaluateArg(expr: CharSequence, numbers: ArrayList<Int>): Int {
+  if (expr.length == 0) throw Exception("Syntax error: Character expected");
   val c = takeFirst(<error>expr</error>)
   if (c >= '0' && c <= '9') {
     val n = c - '0'