[Haskell-cafe] Instrumentation without requiring code-level changes?

[Saurabh Nanda]

The PackageImports hack doesn't seem to be working. Is this a peculiarity
of the extension, or of GHCi, or have I gotten the imports/exports wrong --
https://gist.github.com/saurabhnanda/cab87791d38cca3bfe2cce66cead9080

Note: The package-qualified import and my package name are the **same**

On Fri, Jan 27, 2017 at 2:08 PM, David Turner <dct25-561bs at mythic-beasts.com
> wrote:

> I doubt it'll be removed, it's occasionally useful and I don't think it
> costs much to maintain.
>
> The note does indicate that your proposed usage isn't exactly recommended,
> and I agree: I would instrument everything all the time, to avoid all the
> problems associated with monkey-patching and having two different sets of
> performance characteristics to worry about, but it is at least possible to
> do what you're trying to do with this method.
>
> Cheers,
>
>
>
> On 27 Jan 2017 08:30, "Saurabh Nanda" <saurabhnanda at gmail.com> wrote:
>
> Yes, I think so, with the PackageImports extension.
>>
>> https://downloads.haskell.org/~ghc/7.8.2/docs/html/users_gui
>> de/syntax-extns.html#package-imports
>>
>
> Thank you for this. If this works, it makes using instrumentedscotty &
> instrumentedopaleye easier to use.. Btw, there's a note in the docs:
>
> [...] Note: you probably don't need to use this feature, it was added
> mainly so that we can build backwards-compatible versions of packages when
> APIs change. It can lead to fragile dependencies in the common case:
> modules occasionally move from one package to another, rendering any
> package-qualified imports broken. [...]
>
> I hope GHC doesn't plan to remove this extension any time soon.
>
> -- Saurabh.
>
>
>
>


-- 
http://www.saurabhnanda.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/haskell-cafe/attachments/20170127/dcafe0fb/attachment.html>