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haskell / time

A time library
http://hackage.haskell.org/package/time
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Why doesn't ghc ship time 1.9.x? #107

Closed peti closed 6 years ago

peti commented 6 years ago

I was surprised to find that even recent ghc releases such as 8.6.2 still ship time version 1.8.x. Is anyone aware of the reason why they haven't updated their copy yet?

AshleyYakeley commented 6 years ago

This was due to a miscommunication. You can safely update locally to use time-1.9.2 with GHC 8.6.

GHC 8.8 will ship with the latest time library.

peti commented 6 years ago

It doesn't seem like it's that easy. I added a time > 1.9 constraint to my project's Cabal file, but now I can no longer build it:

$ cabal new-build
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: distribution-suse-0 (user goal)
[__1] trying: vector-0.12.0.1/installed-BKW... (dependency of
distribution-suse)
[__2] trying: primitive-0.6.4.0/installed-1mv... (dependency of vector)
[__3] trying: transformers-0.5.5.0/installed-0.5... (dependency of primitive)
[__4] trying: time-1.8.0.2/installed-1.8... (dependency of distribution-suse)
[__5] trying: base-4.12.0.0/installed-4.1... (dependency of distribution-suse)
[__6] next goal: emu-incident-report (user goal)
[__6] rejecting: emu-incident-report-0 (conflict:
time==1.8.0.2/installed-1.8..., emu-incident-report => time>1.9)
[__6] fail (backjumping, conflict set: emu-incident-report, time)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: unix, base, process, template-haskell,
optparse-applicative, time, primitive, transformers, vector,
data-lens-template, emu-incident-report, distribution-suse

There appears to be an implicit time installed constraint somewhere? Maybe that comes from base? I can work around this by specifying --allow-newer, of course, but this is getting unpleasant fast.

AshleyYakeley commented 6 years ago

Ah, you'll need to drop upper-bounds checking. Try --allow-newer.

AshleyYakeley commented 6 years ago

A number of packages set time < 1.9 and only update that when a new time comes out, but AFAIK there should be no compatibility problem.

AshleyYakeley commented 6 years ago

Sorry, this isn't ideal but it's the best that can be done for the time being.

peti commented 6 years ago

OK, thank you very much for your efforts.