April 2018 - ghc-devs

Site of ghc.haskell.org is down?
by Takenobu Tani 16 Apr '18

16 Apr '18

Hi devs, When I accessed `https://ghc.haskell.org/`, the following message is displayed: Your connection is not secure I checked it with Firefox and Chrome. Is it a matter of site setting? Regards, Takenobu

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Error submitting a code review
by ARJANEN Loïc Jean David 14 Apr '18

14 Apr '18

Hello, I'm currently having an issue submitting my first code review. I recently registered on Phabricator and tried to send my first code review through the web interface. However, Harbormaster is failing to build it with the following error in the lease: Couldn't find remote ref. When searching on Google for this error, I found indications that it's related to Drydock not managing to push the changes to the staging area, likely due to a bad SSH key or git URL for arcanist. Could the SSH key issue also apply when using the web interface?Hoping to read from you soon, I wish you a very good day. Yours sincerely,ARJANEN Loïc

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DTrace patch for FreeBSD breaks ability to function as a bootstrap compiler under FreeBSD
by raichoo 13 Apr '18

13 Apr '18

Hi, Last year I've provided a patch that enables DTrace probes under FreeBSD, sadly as it turns out this currently breaks the ability of GHC 8.4.1 to function as a bootstrap compiler under FreeBSD. I've provided a patch that adds a flag to the build system so one can turn off DTrace in case one needs to build a bootstrap compiler. https://phabricator.haskell.org/D4575 This should probably also contain some heads up in the documentation, otherwise someone might end up with a compiler that's not suitable for bootstrapping. Not sure on how this is being handled. I have an idea on how to fix the actual issue but for the time being this might be a suitable workaround. Maybe we can still get this into 8.4.2? I've already notified the FreeBSD ports maintainers regarding this issue. Sorry for the inconvenience. Kind regards, raichoo

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Re: [ANNOUNCE] GHC 8.4.1 released
by Ryan Scott 12 Apr '18

12 Apr '18

I've submitted a Diff [1] for this. Ryan S. ----- [1] https://phabricator.haskell.org/D4586

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Re: [ANNOUNCE] GHC 8.4.1 released
by Ryan Scott 12 Apr '18

12 Apr '18

Thanks, Ben. It looks like the version number for base has not been bumped to 4.11.1.0, despite incorporating this commit [1] which introduces readFieldHash to base. Currently, this makes it impossible to guard against the existence of the readFieldHash function in a project I'm working on. Ryan S. ----- [1] http://git.haskell.org/ghc.git/commit/d5577f44eaf3b9dfdfc77828038782bf818c1…

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TcPluginContradiction understanding problem and converting Type to Typeable
by alice 11 Apr '18

11 Apr '18

Hello, I'm writing a type-checker plugin for ghc, and I'm stuck on two problems. I can't understand how does TcPluginContradiction work. My problem is, when I do TcPluginContradiction listOfFailedConstraints and run the plugin on something which should fail, compiler output contains strange errors for places which doesn't produce any errors when the rest type checks. And it can be seen from debug that listOfFailedConstraints does contain only the constraints that are expected to fail. For example my plugin should type check Set '[Int]) ~ Set '[Int, Int], and should not Set '[Int, Bool, Int] ~ Set '[Int]. And everything is great when I run it on the first case, but if I run it on the both first and second, the compiler output will contain «Couldn't match type ‘Set '[Int]’ with ‘Set '[Int, Int]’» and «Couldn't match type ‘Set '[Int, Bool, Int]’ with ‘Set '[Int]’». My ghc version is 8.2.2. Also how does ghc converts Type from https://hackage.haskell.org/package/ghc-8.2.1/docs/src/TyCoRep.html#Type <https://hackage.haskell.org/package/ghc-8.2.1/docs/src/TyCoRep.html#Type> to Typeable/TypeRep from https://hackage.haskell.org/package/base-4.10.1.0/docs/src/Data.Typeable.In… <https://hackage.haskell.org/package/base-4.10.1.0/docs/src/Data.Typeable.In…>? I’d like to use a function (if there exists one) that takes Type and returns its fingerprint (https://hackage.haskell.org/package/base-4.10.1.0/docs/src/GHC.Fingerprint.… <https://hackage.haskell.org/package/base-4.10.1.0/docs/src/GHC.Fingerprint.…>). Thank you for your time, Alice.

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ghc-8.4.1-release tag
by Joachim Breitner 11 Apr '18

11 Apr '18

Hi, I noticed that the tag ghc-8.4.1-release points to f31c40efdc918bc9da8a325327ba5a472bd6ea9e but the tarball has different content: $ cat /tmp/ghc-8.4.1/GIT_COMMIT_ID 0a3e2f324dbd525d626ebd3d97e8ffa1cf2f0ffb Ben, would you mind updating the git tag to reflect reality, to avoid confusion (it’s be a forced tag update, but still better than inconsistent information). Cheers, Joachim -- Joachim “nomeata” Breitner mail(a)joachim-breitner.de https://www.joachim-breitner.de/

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How do you build the haddocks for a boot library?
by Simon Jakobi 09 Apr '18

09 Apr '18

Hi, I have some changes to the haddocks in ghc-prim which are re-exported from base. In order to check that I got the syntax right I've tried to build the haddocks by following https://ghc.haskell.org/trac/ghc/wiki/Building/Docs#Haddockdocumentation. Sadly, when I run "make html" in libraries/ghc-prim or libraries/base I get the following error: GNUmakefile:3: libraries/ghc-prim/mk/sub-makefile.mk: No such file or directory make: *** No rule to make target 'libraries/ghc-prim/mk/sub-makefile.mk'. Stop. What should I do instead? Cheers, Simon

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New slow validate errors
by Ömer Sinan Ağacan 08 Apr '18

08 Apr '18

Hi, I see a lot of these errors in slow validate using current GHC HEAD: ghc: panic! (the 'impossible' happened) (GHC version 8.5.20180407 for x86_64-unknown-linux): Each block should be reachable from only one ProcPoint This wasn't happening ~10 days ago. I suspect it may be D4417 but I haven't checked. Ömer

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Re: 8.5 build failure
by Ryan Scott 07 Apr '18

07 Apr '18

I've just landed a commit of Ben's [1] which should fix this issue. Ryan S. ----- [1] Specifically, http://git.haskell.org/ghc.git/commit/54acfbbf64f5fcb108836412e9be0cfabf0d7…

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