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data 型構築子 型変数 ... =
データ構築子A 型式A ...
| データ構築子B 型式B ...
.....
| データ構築子N 型式N ...example15.hs:1:1: error:
Could not find module 'Monad'
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
1 | import Monad
| ^^^^^^^^^^^^
example15.hs:2:1: error:
Could not find module 'System'
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
2 | import System
| ^^^^^^^^^^^^^
example15.hs:3:1: error:
Could not find module 'IO'
Perhaps you meant Id (needs flag -package-key ghc-8.10.4)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
3 | import IO
| ^^^^^^^^^
example15.hs:4:1: error:
Could not find module 'Random'
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
4 | import Random
| ^^^^^^^^^^^^^Preparing to install GHC (tinfo6) to an isolated location.
This will not interfere with any system-level installation.
Downloaded ghc-tinfo6-8.10.4.
ghc-pkg: Couldn't open database /home/sa/.stack/programs/x86_64-linux/ghc-tinfo6-8.10.4/lib/ghc-8.10.4/package.conf.d for modification: {handle: /home/sa/.stack/programs/x86_64-linux/ghc-tinfo6-8.10.4/lib/ghc-8.10.4/package.conf.d/package.cache.lock}: hLock: invalid argument (Invalid argument)
make[1]: *** [: install_packages] Error 1
make: *** [Makefile:51: install] Error 2
Received ExitFailure 2 when running
Raw command: /usr/bin/make install
Run from: /home/sa/.stack/programs/x86_64-linux/ghc-tinfo6-8.10.4.temp/ghc-8.10.4/
Error: Error encountered while installing GHC with
make install
run in /home/sa/.stack/programs/x86_64-linux/ghc-tinfo6-8.10.4.temp/ghc-8.10.4/
The following directories may now contain files, but won't be used by stack:
- /home/sa/.stack/programs/x86_64-linux/ghc-tinfo6-8.10.4.temp/
- /home/sa/.stack/programs/x86_64-linux/ghc-tinfo6-8.10.4/
For more information consider rerunning with --verbose flag
Installing GHC ... . は関数合成をする右結合の演算子です。( ) . take . ( ) というのは、この3つの関数を合成することを意味します。last を合成したものを返す」ものです。n が fun に入ってきます。n は関数 (+ 1) の作用を受けて n + 1 になります。take の作用を受けて、「リストを受け取り、リストの最初の n+1 個を返す関数」になります。(last .) の作用を受けます。これにより、上記の関数はn+1 個を返」したあと「そのリストの一番最後の値を返す」ような関数に変換されます。n 番目（ただし n は1-indexed）で取得する関数と等価になります。-i を使えば複数指定できますし、それをcabalから使えないのもおかしな話ですよね... :pray:main=getLine>>=putStrLn.(:)'k'
ghcide compiled against GHC 9.0.1 but currently using 8.10.4 This is unsupported, ghcide must be compiled with the same GHC version as the project.
: とは何のことですか。scientific> configure scientific> Configuring scientific-0.3.7.0... scientific> build scientific> Preprocessing library for scientific-0.3.7.0.. scientific> Building library for scientific-0.3.7.0.. scientific> [1 of 5] Compiling GHC.Integer.Compat scientific> [2 of 5] Compiling Utils scientific> [3 of 5] Compiling Data.Scientific scientific> scientific> /tmp/stack-fff8d00fdcd912f1/scientific-0.3.7.0/src/Data/Scientific.hs:196:1: error: scientific> • Couldn't match type 'm' with 'Language.Haskell.TH.Syntax.Q' （略） scientific> lift :: Scientific -> m Language.Haskell.TH.Syntax.Exp scientific> (bound at src/Data/Scientific.hs:196:1) scientific> | scientific> 196 | deriving instance Lift Scientific scientific> | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ scientific>
extra-deps: - text-1.2.4.1 - filepath-1.4.2.1 - megaparsec-9.1.0 - parser-combinators-1.3.0 - template-haskell-2.17.0.0 - ghc-boot-th-9.0.1
hmatrix> configure hmatrix> Configuring hmatrix-0.20.2... hmatrix> Cabal-simple_Z6RU0evB_3.2.1.0_ghc-8.10.4.exe: Missing dependencies on foreign hmatrix> libraries: hmatrix> * Missing (or bad) C libraries: blas, lapack hmatrix> This problem can usually be solved by installing the system packages that hmatrix> provide these libraries (you may need the "-dev" versions). If the libraries hmatrix> are already installed but in a non-standard location then you can use the hmatrix> flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are.If hmatrix> the library files do exist, it may contain errors that are caught by the C hmatrix> compiler at the preprocessing stage. In this case you can re-run configure hmatrix> with the verbosity flag -v3 to see the error messages.