IntelliSense fails after readonly keyword

Hi Joe,

I found that IntelliSense stops working after typing the 'readonly' keyword, as shown below:

Without 'readonly', IntelliSense works normally:

The same issue also occurs when using other keywords like 'string':

You can easily reproduced this issue in script mode (screenshots omitted).

My LINQPad version is v9.6.6 (Premium, X64).