Define ParserContext as ref struct

[Shane32]

No description provided.

[sungam3r]

🤔 It seemed to me that I once tried to do this. Do you have a practical scenario when it is required? Let's add ref to LexerContext too.

[Shane32]

🤔 It seemed to me that I once tried to do this. Do you have a practical scenario when it is required? Let's add ref to LexerContext too.

No. It simply is already a ref struct — it is always (and must be) passed by ref; it’s a struct, and it’s internal so the change does not affect the public api or operation but is simply “good housekeeping”

I didn’t look at LexerContext

[Shane32]

The change to ref struct prevents accidental storage on the heap, such as seen by the change to the tests