idris: Functional Programming Language with Dependent Types

[ bsd3, compilers-interpreters, dependent-types, library, program ] [ Propose Tags ]

Idris is a general purpose language with full dependent types. It is compiled, with eager evaluation. Dependent types allow types to be predicated on values, meaning that some aspects of a program's behaviour can be specified precisely in the type. The language is closely related to Epigram and Agda. There is a tutorial at Features include:

  • Full dependent types with dependent pattern matching

  • where clauses, with rule, simple case expressions, pattern matching let and lambda bindings

  • Type classes, monad comprehensions

  • do notation, idiom brackets, syntactic conveniences for lists, tuples, dependent pairs

  • Totality checking

  • Coinductive types

  • Indentation significant syntax, extensible syntax

  • Tactic based theorem proving (influenced by Coq)

  • Cumulative universes

  • Simple foreign function interface (to C)

  • Hugs style interactive environment

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Manual Flags


Build support for libffi


Use GMP for Integers


Use Curses to get the screen width


This is an official release


Build an Idris that doesn't use cabal


Built everything using "-Werror", meant for CI-builds only


Build executables only, skip the libraries and RTS


Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info


Versions [RSS] 0.1.3,, 0.1.4, 0.1.5, 0.1.7,, 0.9.0, 0.9.1, 0.9.2,, 0.9.3,, 0.9.4,, 0.9.5,, 0.9.6,, 0.9.7, 0.9.8, 0.9.9,,,, 0.9.10,, 0.9.11,,, 0.9.12, 0.9.13,, 0.9.14,,,, 0.9.15,, 0.9.16, 0.9.17,, 0.9.18,, 0.9.19,, 0.9.20,,, 0.10, 0.10.1, 0.10.2, 0.10.3, 0.11, 0.11.1, 0.11.2, 0.12, 0.12.1, 0.12.2, 0.12.3, 0.99, 0.99.1, 0.99.2, 1.0, 1.1.0, 1.1.1, 1.2.0, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4
Change log CHANGELOG
Dependencies annotated-wl-pprint (>=0.7 && <0.8), ansi-terminal (<0.7), ansi-wl-pprint (<0.7), base (>=4 && <5), base64-bytestring (<1.1), binary (>=0.7 && <0.8), blaze-html (>= && <0.9), blaze-markup (>= && <0.8), bytestring (<0.11), cheapskate (<0.2), containers (>=0.5 && <0.6), deepseq (<1.5), directory (>= && < || >, filepath (<1.5), fingertree (>=0.1 && <0.2), haskeline (>=0.7 && <0.8), idris, mtl (>=2.1 && <2.3), network (<2.7), optparse-applicative (>=0.11 && <0.12), parsers (>=0.9 && <0.13), pretty (<1.2), process (<1.3), safe, split (<0.3), text (>= && <1.3), time (>=1.4 && <1.6), transformers (<0.5), transformers-compat (>=0.3), trifecta (>=1.1 && <1.6), uniplate (>=1.6 && <1.7), unix (<2.8), unordered-containers (<0.3), utf8-string (<1.1), vector (<0.12), vector-binary-instances (<0.3), Win32 (<2.4), zip-archive (> && <0.2.4), zlib (<0.6) [details]
License BSD-3-Clause
Author Edwin Brady
Maintainer Edwin Brady <>
Category Compilers/Interpreters, Dependent Types
Home page
Source repo head: git clone git://
Uploaded by EdwinBrady at 2015-11-08T12:04:06Z
Distributions Arch:1.3.4, Fedora:1.3.4, NixOS:1.3.4
Executables idris-codegen-node, idris-codegen-javascript, idris-codegen-c, idris
Downloads 66465 total (149 in the last 30 days)
Rating 2.25 (votes: 2) [estimated by Bayesian average]
Your Rating
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Status Docs available [build log]
Last success reported on 2015-11-08 [all 1 reports]

Readme for idris-0.9.20

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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.