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The contents of ocharles.org.uk/blog

License: BSD 3-Clause "New" or "Revised" License

Haskell 58.98% HTML 3.52% JavaScript 34.40% Smarty 0.49% CSS 2.17% Nix 0.43%

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"Deriving" post: "type MiniIoF = Free MiniIoF" doesn't compile

The first example in 24 Days of GHC Extensions: Deriving doesn't seem to compile.

λ> :set -package free
package flags have changed, resetting and loading new packages...

λ> import Control.Monad.Free

λ> :set -XDeriveFunctor

λ> :{
|> data MiniIoF a = Terminate
|>               | PrintLine String a
|>               | ReadLine (String -> a)
|>               deriving Functor
|> 
|> type MiniIoF = Free MiniIoF
|> :}

<interactive>:10:1: error:
    Multiple declarations of ‘MiniIoF’
    Declared at: <interactive>:5:1
                 <interactive>:10:1

Was the second MiniIoF definition supposed to be named MiniIoM, perhaps?

DNS fails

Trying to hit blog.ocharles.org.uk:

blog.ocharles.org.uk’s DNS address could not be found.

Typo in list of monoids

… if we change our functions to instead to a list of these monoidal values.

There’s something missing here, I think?

No repo for fast-downward?

I couldn’t find a repo mentioned in the blog post (nor indirectly via the linked hackage package)

Expired SSL certificate of https://ocharles.org.uk

SDL2 blog post code doesn't compile

I copied and pasted the code at https://ocharles.org.uk/blog/posts/2015-09-07-announcing-sdl2.html and it doesn't compile with sdl2-2.0.0.

how to fix "stack build" error?

hi.

cd /usr/local
git clone https://github.com/ocharles/blog ocharles-blog
cd ocharles-blog

root@AR:/usr/local/ocharles-blog# stack init
root@AR:/usr/local/ocharles-blog# stack build
it shows:
...
While building package wai-app-static-3.1.6.1 using:
/root/.stack/setup-exe-cache/i386-linux/setup-Simple-Cabal-1.24.0.0-ghc-8.0.1 --builddir=.stack-work/dist/i386-linux/Cabal-1.24.0.0 build --ghc-options " -ddump-hi -ddump-to-file"
Process exited with code: ExitFailure 1
Logs have been written to: /usr/local/ocharles-blog/.stack-work/logs/wai-app-static-3.1.6.1.log

Configuring wai-app-static-3.1.6.1...
Building wai-app-static-3.1.6.1...
Preprocessing library wai-app-static-3.1.6.1...
[1 of 9] Compiling WaiAppStatic.Types ( WaiAppStatic/Types.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/WaiAppStatic/Types.o )
[2 of 9] Compiling Util             ( Util.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/Util.o )
[3 of 9] Compiling WaiAppStatic.Listing ( WaiAppStatic/Listing.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/WaiAppStatic/Listing.o )

/tmp/stack10300/wai-app-static-3.1.6.1/WaiAppStatic/Listing.hs:67:34: warning: [-Wname-shadowing]
    This binding for ‘pieces’ shadows the existing binding
      bound at WaiAppStatic/Listing.hs:27:16

/tmp/stack10300/wai-app-static-3.1.6.1/WaiAppStatic/Listing.hs:120:24: warning: [-Wunused-local-binds]
    Defined but not used: ‘isFile’
[4 of 9] Compiling WaiAppStatic.Storage.Filesystem ( WaiAppStatic/Storage/Filesystem.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/WaiAppStatic/Storage/Filesystem.o )
[5 of 9] Compiling WaiAppStatic.Storage.Embedded.Runtime ( WaiAppStatic/Storage/Embedded/Runtime.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/WaiAppStatic/Storage/Embedded/Runtime.o )
[6 of 9] Compiling WaiAppStatic.Storage.Embedded.TH ( WaiAppStatic/Storage/Embedded/TH.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/WaiAppStatic/Storage/Embedded/TH.o )

/tmp/stack10300/wai-app-static-3.1.6.1/WaiAppStatic/Storage/Embedded/TH.hs:10:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
[7 of 9] Compiling WaiAppStatic.Storage.Embedded ( WaiAppStatic/Storage/Embedded.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/WaiAppStatic/Storage/Embedded.o )
[8 of 9] Compiling Network.Wai.Application.Static ( Network/Wai/Application/Static.hs, .stack-work/dist/i386-linux/Cabal-1.24.0.0/build/Network/Wai/Application/Static.o )
<command line>: can't load .so/.DLL for: /root/.stack/snapshots/i386-linux/lts-7.1/8.0.1/lib/i386-linux-ghc-8.0.1/random-1.1-54KmMHXjttlERYcr1mvsAe/libHSrandom-1.1-54KmMHXjttlERYcr1mvsAe-ghc8.0.1.so (/root/.stack/snapshots/i386-linux/lts-7.1/8.0.1/lib/i386-linux-ghc-8.0.1/random-1.1-54KmMHXjttlERYcr1mvsAe/libHSrandom-1.1-54KmMHXjttlERYcr1mvsAe-ghc8.0.1.so: undefined symbol: timezm1zi6zi0zi1_DataziTimeziClockziCTimespec_getCTimespec1_closure)

root@AR:/usr/local/ocharles-blog#

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