[Haskell-cafe] Significant changes in -Wall for GHC 7.10

Omari Norman omari at smileystation.com
Tue May 5 15:03:36 UTC 2015

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 <omari at smileystation.com>

> 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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