Complete interactive development program for Haskell

LTS Haskell 9.1:0.1.21
Stackage Nightly 2017-08-19:0.1.21
Latest on Hackage:0.1.21
BSD3 licensed by Chris Done, The University of Glasgow
Maintained by

Module documentation for 0.1.21

There are no documented modules for this package.

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Complete interactive development program for Haskell

Intero for Emacs

Please see the homepage for Intero for Emacs.

Default key bindings

Key binding | Description --- | --- M-. | Jump to definition C-c C-i | Show information of identifier at point C-c C-t | Show the type of thing at point, or the selection C-u C-c C-t | Insert a type signature for the thing at point C-c C-l | Load this module in the REPL C-c C-c | Evaluate the selected region in the REPL C-c C-r | Apply suggestions from GHC C-c C-k | Clear REPL C-c C-z | Switch to and from the REPL

Enabling intero

To enable intero in all haskell-mode buffers by default, enable intero-global-mode, by using M-x customize or by adding (intero-global-mode 1) to your Emacs start-up files.

Intero will then activate for all projects, and for files without a stack.yaml, it will assume the "global" project. If you want to use an alternate stack yaml configuration file (for example, when developing for multiple GHC versions), use M-x intero-stack-yaml to switch file. When switching configuration, you will asked whether you want to preserve this choice across emacs sessions for the given project.

Whitelisting/blacklisting projects

Some users prefer to enable Intero selectively. The custom variables intero-blacklist and intero-whitelist are provided for this purpose, and are honoured by intero-global-mode:

If the parent directory of a Haskell file is listed in intero-blacklist, then intero will not be enabled for that file, unless a parent directory of that file is also listed in intero-whitelist. In other words, whitelist entries take precedence. You can therefore blacklist / to disable intero in all projects unless they are whitelisted.

Intero for IDE writers

Please see the file for how to use Intero to integrate your own editor..


Issues are split into low/medium/high priorities which dictates which ones will be implemented first.


* More robust name finding, fixes bug

* Support completion of qualified identifiers

* Completion in the REPL gets updated properly when imports

* :unset -XFoo now works

* Re-add back collecting type info after any load

* Bring back :completion

* Fix bug in :type-at returning outer span info (

* Emacs mode automatically installs latest intero.
* intero-list-buffers command.
* Fix cl-case reference
* Add warning when used outside of stack exec/stack ghci
* Transfer to commercialhaskell

* Support --version

* Completion for module's local imports and definitions (
* Starting the REPL takes the targets chosen for the backend
* Prompt displays interrobang for cuteness (

* Support GHC 8
* Fix completion before any module is loaded (
* Add completion for custom commands
* Add data-files entry for Emacs Lisp code
* Collect type-info whenever anything is loaded (

* Don't use -dynamic on Windows.

* Remove "flags: " message

* Make better, more liberal :type-at (
* Better argument parser for :type-at, :loc-at, :uses
* Retain names that were in scope after a successful load for :complete

* Add upper bound for GHC (

* Fix cache invalidation bug for interpreted mode (

* Added test suite
* Fix bug in :type-at that excluded a type constraint (

* Fixed bug in :uses, by using location equality.
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