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How do I install Haskell HLint?
Installation follows the standard pattern of any Haskell library or program, simply type cabal update to update your local hackage database, then cabal install hlint to install HLint. Once HLint is installed, simply run hlint source where source is either a Haskell file or a directory containing some Haskell files.
What is HLint Haskell?
HLint is a tool for suggesting possible improvements to Haskell code. These suggestions include ideas such as using alternative functions, simplifying code and spotting redundancies. This document is structured as follows: Installing and running HLint.
How do I install cabal Haskell?
To install the cabal executable you can use ghcup (if you’re using Linux), the Haskell Platform, install the cabal-install package from your distributions package manager (if using Linux or Mac), or download the source or prebuilt binary from the Download page.
How do I run Ghci?
GHCi. GHCi is the interactive interface to GHC. From the command line, enter “ghci” (or “ghci -W”) followed by an optional filename to load. Note: We recommend using “ghci -W”, which tells GHC to output useful warning messages in more situations.
What is Ghcup?
ghcup makes it easy to install specific versions of ghc on GNU/Linux as well as macOS (aka Darwin), and can also bootstrap a fresh Haskell developer environment from scratch. It follows the unix UNIX philosophy of do one thing and do it well. Similar in scope to rustup, pyenv and jenv.
Where does cabal install?
Using Cabal By default stack installs packages to ~/. cabal and ~/. ghc in your home directory. For more details see the cabal install page.
Where does Ghcup install GHC?
Installs a specified GHC version into ~/. ghcup/ghc/ , and places ghc- symlinks in ~/. ghcup/bin/ . Optionally, an unversioned ghc link can point to a default version of your choice.
Should I learn rust or Haskell?
Haskell: As you can see, while both programming languages have their ups and downs, Rust is exponentially more popular than Haskell. This means there are more resources available for Rust, which makes it a better pick for building APIs if you want something that will work straight out of the gate.
How to install hlint from a Haskell file?
Installation follows the standard pattern of any Haskell library or program: type cabal update to update your local hackage database, then cabal install hlint to install HLint. Once HLint is installed, run hlint source where source is either a Haskell file, or a directory containing Haskell files.
How to install hlint on a Hackage database?
Installation follows the standard pattern of any Haskell library or program, type cabal update to update your local hackage database, then cabal install hlint to install HLint. Once HLint is installed, run hlint source where source is either a Haskell file, or a directory containing Haskell files.
Where can I find the source of hlint?
Once HLint is installed, run hlint source where source is either a Haskell file, or a directory containing Haskell files. A directory will be searched recursively for any files ending with .hs or .lhs. For example, running HLint over darcs would give:
Why does hlint suggest incorrect changes to the code?
Sometimes HLint will change the code in a way that causes values to default to different types, which may change the behaviour. HLint assumes duplicate identical expressions within in a single expression are used at the same type. The RebindableSyntax extension can cause HLint to suggest incorrect changes.