Var declaration checking

[boriel]

Perfect!
I think the sintaxis is very clear.
When you have the option implemented, I'll start using it.
As Pascal enthusiast, I think it should be active by default.

So do I. ZX BASIC started as a project with high Sinclair BASIC compatibility, but with the time I started to diverge in order to achieve higher performance. For compatibility, people should always use the --sinclair flag.