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Warning and error diagnostics from GHC
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Type information and documentation on hover, including your own comments.
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Jump to definition: for now only for local code definitions
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Document symbols
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Highlight references in document
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Code completion
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Formatting via Brittany, Floskell, Fourmolu, Ormolu or Stylish Haskell
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Code evaluation (Haskell Language Server), see (Tutorial)
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Integration with retrie
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Code lenses for explicit import lists
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Generate functions from type signatures, and intelligently complete holes using Wingman (tactics)
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Integration with hlint to show diagnostics and apply hints via apply-refact
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Module name suggestions for insertion or correction
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Call hierarchy support
