code: final public ExecExpressionBuilder<T> exec() {
      final int sourceLineNumber = builder.getSourceLineNumber();
      return new ExecExpressionBuilder<T>(new ExpressionHandler<T>() {
        public T handleExpression(Expression e) {
          return statementHandler().handleStatement(new ExpressionStatement(sourceLineNumber, e));
        }
      });
    }
docs: exec().{expression}.endExec()
  @return an expression builder