flagging runtime null dereferencing

[Stewart Gordon]

"Steven Schveighoffer" <schveiguy at yahoo.com> wrote in message 
news:gfkui3$228r$1 at digitalmars.com...
>I know this has been brought up many times, but I think possibly the 
>usefulness of this feature has been underestimated, and its cost 
>overestimated.

I agree.

<snip>
> 3. check for null can easily be removed during release mode, especially if 
> it translates directly into an assert.
<snip>

NullDerefError (or whatever we end up calling it) should probably be a 
separate exception class, just like the existing ArrayBoundsError and 
SwitchError.  These are all things that are omitted when compiling in 
release mode.

Stewart.

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