Talkative Join points warning

[Matthew Pickering]

#13221 is related

On Thu, Feb 2, 2017 at 9:36 PM, Ben Gamari <ben at well-typed.com> wrote:
>
> Hi Luke,
>
> I've noticed that a new WARN in OccurAnal seems to be quite loud.
> Validations now produce thousands of lines of the form,
>
>     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
>       OccurAnal failed to rediscover join point(s): [$j_shTG]
>     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
>       OccurAnal failed to rediscover join point(s): [$w$j_sl22]
>     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
>       OccurAnal failed to rediscover join point(s): [$w$j_sl1W]
>     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
>       OccurAnal failed to rediscover join point(s): [$w$j_sl1Q]
>
> Do you think we could either quiet the warning down a bit or perhaps
> disable it by default? It makes it rather difficult to see through the
> noise.
>
> This is actually perhaps another case where Simon Marlow suggestion of
> introducing a family of -v* flags (e.g. -fvanishing-join-points) might
> be helpful.
>
> Cheers,
>
> - Ben
>
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