Annotating ExpressionStatement causes a compiler error

Statement ::= AnnotationStatement
                | ExpressionStatement

And the rules relevant to expressions with annotations are:
UnaryExpression ::= UnannotatedUnaryExpression
                      | Annotations UnannotatedUnaryExpression
    

@Ann (2+4)

interface Ann extends MethodAnnotation, ClassAnnotation, FieldAnnotation, ImportAnnotation, PackageAnnotation, TypeAnnotation, ExpressionAnnotation, StatementAnnotation {}
class Test {
	def m(Any)=1;
	def test() {		
		m(@Ann m(2));// ok
		@Ann m(2); // todo: it should parse!
	}
}


C:\cygwin\home\Yoav\test\Hello.x10:4,15-34
Message: Syntax Error: Syntax error: Token "*" expected instead of this input

Position:
C:\cygwin\home\Yoav\test\Hello.x10:5,25-26
Message: Syntax Error: Syntax error: Token "PackageDeclaration" expected after this input

Position:
C:\cygwin\home\Yoav\test\Hello.x10:13,16-14,17
Message: Syntax Error: Syntax error: Token(s) inserted to complete scope: "}"

Position:
C:\cygwin\home\Yoav\test\Hello.x10:16,1-2
Message: Syntax Error: Syntax error: Unexpected input ignored: "ERROR_TOKEN"