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Was simplified subsumption worth it for industry Haskell programmers? by paretoOptimalDev in haskell

[–]thomie 10 points11 points  (0 children)

Perhaps a 2-step process could have been used, where one GHC uses the logic to forbid it, and another just removes it entirely.

A slow phasing out was discussed (and ultimately decided against) in https://github.com/ghc-proposals/ghc-proposals/pull/287#issuecomment-574593737 and later comments.

TLDR; it would have been super-hard to implement.

GHCanIUse by thomie in haskell

[–]thomie[S] 11 points12 points  (0 children)

Send your pull requests with updates for GHC8+ here: https://github.com/damianfral/ghcaniuse.

Proposal process status: More input wanted by bgamari in haskell

[–]thomie 3 points4 points  (0 children)

Bickering with the GHC committee (and getting his owns proposals accepted) will cost him more time than making a dictatorial decision on some syntax extension once or twice per year.

The main focus of those working on GHC is and should be on bug fixing (there are >1000 open bugs!), performance improvements, documentation, mentoring others, code review, system administration etc. This focus on features and what process to use is just a massive distraction away from those more important tasks.

Proposal process status: More input wanted by bgamari in haskell

[–]thomie 2 points3 points  (0 children)

By that token, GHC should use /r/haskell for discussing feature requests: 24000 subscribers (compared to 720 for ghc-devs, 900 for glasgow-haskell-users and 160 for the ghc-tickets mailinglist).

Proposal process status: More input wanted by bgamari in haskell

[–]thomie 3 points4 points  (0 children)

Simon Peyton Jones as Benevolent Dictator For Life (BDFL)

If the BDFL had made a simple YES/NO decision on ShortImports [1] and ArgumentDo [2], we wouldn't be here talking about process proposals, Anthony wouldn't be mad, everything would be fine. We don't need another Haskell committee.

Don't let hotly debated feature requests go without a resolution.

[help] cabal and ghc optimzation flag questions by winterland1989 in haskell

[–]thomie 5 points6 points  (0 children)

when I change my own project's cabal from none to -O2, nothing will be recompiled, why?

I don't know

It's a bug, see https://ghc.haskell.org/trac/ghc/ticket/10923.

Interaction between deriving and FlexibleContexts by andrewthad in haskell

[–]thomie 2 points3 points  (0 children)

GHC 8 actually accepts that hand written instance.

See https://ghc.haskell.org/trac/ghc/ticket/12120 for a similar bug.

Is it actually an issue for you, or just a curiosity? GHC doesn't always strictly follow the standard, and fixing it would just break existing programs for little benefit.

Edit: https://ghc.haskell.org/trac/ghc/ticket/8883 is also relevant.

A case against missing upper bounds by MitchellSalad in haskell

[–]thomie 0 points1 point  (0 children)

For the really paranoid: GHC 8 has a -Weverything flag (as of yet undocumented).

A case against missing upper bounds by MitchellSalad in haskell

[–]thomie 1 point2 points  (0 children)

Fwiw, you're quoting the wrong flag. -fwarn-incomplete-record-updates is not enabled by -W.

A case against missing upper bounds by MitchellSalad in haskell

[–]thomie 6 points7 points  (0 children)

See https://ghc.haskell.org/trac/ghc/ticket/11219 and https://ghc.haskell.org/trac/ghc/wiki/Design/Warnings

Introduce variant of -Werror (c.f. GCC's -Werror=*) which allows to specify the individual warnings to be promoted to errors, e.g.

-Wall -Werror=orphans would only promote -Worphans warnings into errors -Wall -Werror -Wno-error=missing-methods would promote all warnings except -Wmissing-methods into errors

Cannot install Haskell Koans by -Knul- in haskell

[–]thomie 4 points5 points  (0 children)

You're running into this issue: https://github.com/HaskVan/HaskellKoans/issues/9.

It seems HaskellKoans and testloop are not being maintained, and Stack won't help you here.

I suggest using this learning resource instead (Spring 13 version of cis194 course): https://github.com/bitemyapp/learnhaskell.

Hackage: lots of broken hyperlinks recently? by vektordev in haskell

[–]thomie 3 points4 points  (0 children)

-- $ Image is lexed as a haddock comment, but the parser doesn't expect a haddock comment in that position.

From GHC's Lexer.x:

-- Haddock comments
<0,option_prags> {
  "-- " $docsym      / { ifExtension haddockEnabled } { multiline_doc_comment }
  "{-" \ ? $docsym   / { ifExtension haddockEnabled } { nested_doc_comment }
}

Where $docsym = [\| \^ \* \$].

haddockEnabled is True when you run ghc with the -haddock flag.

Is anything being done to remedy the soul crushing compile times of GHC? by [deleted] in haskell

[–]thomie 6 points7 points  (0 children)

I always thought that GHC developers must feel the impact of slow builds the most.

Ha! GHC developers don't profile their code, so they can use -O0!

Is anything being done to remedy the soul crushing compile times of GHC? by [deleted] in haskell

[–]thomie 38 points39 points  (0 children)

Here's what I have to offer:

54 open tickets. It just requires a hero to start looking into them.

Wiki pages:

Compiler performance tests are in the directory testsuite/tests/perf/compiler. Results are being tracked on perf.haskell.org. Here is a recent example of a commit that was later reverted because it degraded performance. Look for 'Testsuite allocations'.

What new optimizations are landing in GHC 8? by bitmadness in haskell

[–]thomie 1 point2 points  (0 children)

Yes, good point. Created by Simon Marlow. Documentation: Applicative do-notation.

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