[GHC] #10913: deprecate and then remove -fwarn-hi-shadowing

[Chris Upshaw]

It seems like we lost the code that -fwarn-hi-shadow switched during the
add of hierarchical modules in 5.0. And while the hierarchical system makes
the common way .hi files could get shadowed impossible, you can still get
.hi file shadowing if you use the -i flag on multiple folders.

Do we care? It is a potential source of very hard to find bugs, but it is
also kind of a pathological case with how the modern module system works.
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Status of deprecation/warning features (was: Monad of no `return` Proposal (MRP): Moving `return` out of `Monad`)

[Herbert Valerio Riedel]

On 2015-09-28 at 04:56:13 +0200, David Feuer wrote:

[...]

> That's an excellent idea, and I think it makes sense to offer it at the
> module level as well as the class level. Just change DEPRECATED to REMOVED
> when it's actually removed. Speaking of such, has the deprecated export
> proposal made any headway?


As far as the in-flight library proposals are concerned, I plan to
rather have hardwired specific warnings implemented in the style of the
AMP warnings as it's crucial to have them available for the GHC 8.0
release to have the foundations for the migration plans in place. We can
generalize those feature later-on (maybe even in time for GHC 8.0 if
we're lucky).



As for the more general facilities the short answer is:

  They're stalled! Volunteers wanted!


There's the specification over at

 - https://ghc.haskell.org/trac/ghc/wiki/Design/MethodDeprecations

and there are 3 somewhat connected/related warning-feature tickets which
ought to be co-designed to avoid obstructing each other (if there's any
risk there).

 - https://ghc.haskell.org/trac/ghc/ticket/10071
 - https://ghc.haskell.org/trac/ghc/ticket/2119
 - https://ghc.haskell.org/trac/ghc/ticket/4879

For #10071 there's a very modest start at implementing this, which
just modifies the parser but doesn't go much farther (see wip/T10071 branch)

There's an old patch for #4879 which still works over at

 - https://phabricator.haskell.org/D638


Cheers,
  hvr
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