Sorry I forgot to reply to the list. Here is my earlier email -------- Forwarded Message -------- Subject: Re: [Haskell-cafe] Significant changes in -Wall for GHC 7.10 Date: Tue, 05 May 2015 16:29:46 +0100 From: Alexander Eyers-Taylor To: Omari Norman Those seem to be preciously the flags enabled by -Wall. It seems when updating the documentation the negative was missed and it was updated to list the flags enabled by -Wall. I have submitted a ticket (#10386) to fix the bug. On 05/05/15 16:03, Omari Norman wrote:

CORRECTION: -fwarn-trustworthy-safe was not in -Wall in GHC 7.8, but -fwarn-trustworthy-safe did not exist in GHC 7.8.

On Tue, May 5, 2015 at 10:54 AM, Omari Norman mailto:omari@smileystation.com> wrote:

I noticed some significant changes to the flags included with -Wall in GHC 7.10. Many flags that were previously included in -Wall are now not included. These include:

-fwarn-type-defaults -fwarn-name-shadowing -fwarn-missing-signatures -fwarn-hi-shadowing -fwarn-orphans -fwarn-unused-do-bind -fwarn-trustworthy-safe

I can't find any mention in the release notes of this change in behavior.

I was wondering what the rationale is for these changes? Any link to relevant discussion would be appreciated if it exists.

Also, what opinion do people have? I previously kept my code -Wall clean, but sometimes that would be a pain. For instance I would munge local names so they wouldn't trigger -fwarn-name-shadowing, and I would add signatures to integers so they wouldn't trigger -fwarn-type-defaults. In fact, I only noticed this change in behavior in 7.10 because I was considering dumping -Wall, and when I looked at the 7.10 manual I saw that it does not enable -fwarn-name-shadowing. (I still use 7.8 but Google pulled the 7.10 manual.) Does this change indicate that people were finding -Wall too onerous and, thus, not using it?

I do remember reading complaints about -fwarn-unused-do-bind being added to -Wall, but I previously felt dirty about name shadowing though I wondered if munging names to avoid shadowing was actually worse.

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