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ghc
Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Haskell's error messages truly need improvement. There seems to be a great effort to do just during the last few years though. The haskell/error-messages repo is compiling a list of bad error messages that will hopefully be improved with time. Maybe we'll get error messages almost as friendly as rust's some day
$ ghci GHCi, version 9.2.1: https://www.haskell.org/ghc/ :? for help > 1 + [1,2] :1:1: error: • No instance for (Num [Integer]) arising from a use of ‘it’ • In the first argument of ‘print’, namely ‘it’ In a stmt of an interactive GHCi command: print it