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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. So far, 141 errors and warnings are documented here. If yo