The Haskell Error Index — Haskell Error Index
Welcome This site describes the various messages that can be returned by Haskell-related tools, including both errors and warnings. For example GHC, the most-commonly-used Haskell implementation, started emiting a code with the format [GHC-12345] for its messages in version 9.6.1. These codes can be looked up below for further information. Other Haskell-related tools are welcome to add their own m
Error Messages in Haskell, and how to Improve them
Main.hs:3:11: error: • No instance for (Num a) arising from a use of ‘+’ Possible fix: add (Num a) to the context of the type signature for: foo :: forall a. a -> a -> a • In the expression: a + b In an equation for ‘foo’: foo a b = a + b | 3 | foo a b = a + b | ^^^^^ On a pure technical level, this is correct. The usage of (+), as a function with type signature (Num a) => a -> a -> a, causes a co
Exceptions Best Practices in Haskell - FP Complete
The content below is still correct, but has been absorbed into the more comprehensive safe exception handling tutorial document instead. I recommend reading that, which provides more information and more up-to-date library references. Over the years, I’ve written a number of different documents, tutorials, comments, and libraries on how to do proper exception handling in Haskell. Most of this has
1
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
処理を実行中です
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
GitHub - bollu/hask-error-messages-catalog: A catalog of broken Haskell programs to improve error messages
