Class expressions should be allowed in a member expression without parenthesizing

[bterlson]

print(class foo { }.toString());

Actual: Syntax Error
Expected: "class foo { }"

[ianwjhalliday]

Appears that it is actually the call syntax that is causing the error.
print(class foo { }.toString);
parses fine and behaves correctly (printing the toString function object)

[ianwjhalliday]

Not sure why but the parser was written to explicitly disallow call syntax following a class expression. Perhaps a copy paste error. Very easy fix. #1468