https://bugzilla.wikimedia.org/show_bug.cgi?id=378

--- Comment #19 from Quiddity <[email protected]> ---
There are 3 separate issues here:

(In reply to xmlizer from comment #0)
> And in X -> Y(r) -> Z(r) -> {T}, the link in X to Y should be a red link
> because the last {T} doesn't exists

1) Double redirects. We don't do these at all, and processes exist to
automatically fix them. See:
https://en.wikipedia.org/wiki/Wikipedia:Double_redirects
https://en.wikipedia.org/wiki/Special:DoubleRedirects
[Definite WONTFIX. But not seriously considered except in Comment #0.]


2) Whether we're *allowed* to create/keep Redirects to non-existent targets. At
the surface this is guideline/policy issue. However, one major aspect
preventing their acceptance is the confusion that would arise if one of these
Redirects was linked within an article. It would look blue, but lead nowhere.
Hence:


3) Whether links to Redirects to currently-non-existent targets can technically
be colored red.
I.e. X -> Y(r) -> {T}, where {T} doesn't exist, the link in X to Y could be a
red link. 
This would be quite useful, as Michael Hardy explains best in Comment #7. 
They're currently (on Enwiki) speedily-deleted per [[WP:CSD#G8]] (criteria for
speedy deletion - General issue #8), specifically: "redirects to invalid
targets, such as non-existent targets".

So, the question is:
* MediaWiki: Is there another (cheaper) method of checking if a redirect
targets an existing page? 
E.g. Could editors add a template to the redirect, specifying that it's a
{pre-emptive redirect}, and thus incoming links should be marked red (until
that template is removed)?
Or something else?

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