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idris-lang / Idris-dev


A Dependently Typed Functional Programming Language



Build Status Documentation Status Hackage

Idris ( is a general-purpose functional programming language with dependent types.

Standard Installation Instructions

This repository represents the latest development version of the language, and may contain bugs that are being actively worked on. For those who wish to use a more stable version of Idris please consider installing the latest version that has been released on Hackage. Installation instructions for various platforms can be found on the Idris Wiki.

Installing Development Versions

If you like to work against the latest development version, please consider using Cabal Sandboxes to minimise disruption to your local Haskell setup. Instructions for installing Idris HEAD within a cabal sandbox are available on the Idris Wiki.

To configure, edit The default values should work for most people.

Idris is built using a Makefile common targets include:

  • make This will install everything using cabal and typecheck the libraries.
  • make test This target execute the test suite.
  • make relib This target will typecheck and recompile the standard library.

Idris has an optional buildtime dependency on the C library libffi. If you would like to use the features that it enables, make sure that it is compiled for the same architecture as your Haskell compiler (e.g. 64 bit libraries for 64 bit ghc). By default, Idris builds without it. To build with it, pass the flag -f FFI.

To build with libffi by default, create a file and add the following line to it:


The file is a suitable example.

The continuous integration builds on are built using the ghc-flag -Werror. To enable this behaviour locally also, please compile using make CI=true or adding the following line into

CI = true

If you are only compiling for installing the most current version, you can omit the CI flag, but please make sure you use it if you want to contribute.

Code Generation

Idris has support for external code generators. Supplied with the distribution is a C code generator to compile executables, and a JavaScript code generator with support for node.js and browser JavaScript.

At this moment in time there are two external repositories with a Java code generator and an LLVM-based code generator.

More Information

If you would like to find out more information, or ask questions, we currently have a Wiki; a mailing list, and an IRC channel #idris on freenode. To join the IRC channel, point your irc client to then /join #idris.

For those further interested in using Idris for projects, the Idris Hackers GitHub organisation is where some interesting projects are being hosted.

For those interested in contributing to Idris directly we kindly ask that prospective developers please consult the Contributing Guide first.