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new checking rules on contextual expressions

Rémi requested to merge typer_extend_contextual_expression into dev

Motivation and Context


type t = {one : int}

let main =
  (fun (i : unit) -> let _v = i in
     fun s -> + 1
   : unit -> t -> int)




  • compiler
  • website
  • webide
  • vscode-plugin
  • debugger

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Performance improvement (non-breaking change that improves performance)
  • None (change with no changelog)


Improve typechecker inference across contextual expressions (e.g. let .. in, type .. in, module .. in)


  • If a new syntax has been introduced, put a message on slack ligo-lsp
  • Changes follow the existing coding style (use dune @fmt to check).
  • Tests for the changes have been added (for bug fixes / feature).
  • Documentation has been updated.
  • Changelog description has been added (if appropriate).
  • Start titles under ## Changelog section with #### (if appropriate).
  • There is no image or uploaded file in changelog
  • Examples in changed behaviour have been added to the changelog (for breaking change / feature).
Edited by Rémi

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