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Fix bug in pattern matching compiler

Rémi requested to merge fix_pattern_matching_simpl into dev

Motivation and Context


Fix a bug in which pattern matching was throwing an error for no apparent reason. It was due to a generated michelson failwith on a string, having a forall type. In addition, we also now morph the failwith <string> to failwith <unit>, reducing contract size


  • 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)



  • 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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