bug#11314: 24.1.50; Regression: incorrect Lisp indentation for `if' with `@@@@@@'

[Drew Adams]

 > > Yet @@@@@@ is a perfectly good symbol/variable name etc.
> 
> FWIW, this is probably due to @ being special in the case of ,@,

That was my guess too.

> so if we fix this, we should be careful not to reintroduce
> errors

Yes.  Except I hope you really mean "when", not "if".

> such as C-h v trying to use "@foo" rather than "foo" when
> we're on ",@foo".

Yes.

The fact that this is a regression might offer some hope (if you are the
optimistic sort): at one time it worked.

And `C-h v @foo' also works correctly in Emacs prior to Emacs 22.  And `C-h v'
picks up `@foo' as the default value no matter where the cursor is on the chars
of `@foo'.