Fixes dart-lang#1403. Added test that super cannot be used as an expression

Author: sgrekhov

Language/Expressions/syntax_t02.dart

@@ -0,0 +1,50 @@
+// Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion An expression is a fragment of Dart code that can be evaluated at
+/// run time
+/// ...
+///  <expression> ::= <assignableExpression> <assignmentOperator> <expression>
+/// | <conditionalExpression>
+/// | <cascade>
+/// | <throwExpression>
+/// <expressionWithoutCascade> ::=
+/// <assignableExpression> <assignmentOperator> <expressionWithoutCascade>
+/// | <conditionalExpression>
+/// | <throwExpressionWithoutCascade>
+/// <expressionList> ::= <expression> (‘,’ <expression>)*
+/// <primary> ::= <thisExpression>
+/// | super <unconditionalAssignableSelector>
+/// | super <argumentPart>
+/// | <functionExpression>
+/// | <literal>
+/// | <identifier>
+/// | <newExpression>
+/// | <constObjectExpression>
+/// | <constructorInvocation>
+/// | ‘(’ <expression> ‘)’
+/// <literal> ::= <nullLiteral>
+/// | <booleanLiteral>
+/// | <numericLiteral>
+/// | <stringLiteral>
+/// | <symbolLiteral>
+/// | <listLiteral>
+/// | <setOrMapLiteral>
+/// @description Checks that `super` without selector or argument part cannot be
+/// used as an expression
+/// @author [email protected]
+/// @issue 43168
+
+class C {
+  foo() {
+    print(super);
+//        ^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  }
+}
+
+main() {
+  C().foo();
+}