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[#1652] Implement prepare rename request

Motivation and Context

Resolves #1652 (closed)


Implements prepare rename. This displays to the user that some lexemes cannot be renamed (like built-in types or keywords).

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)


Implements the prepare rename request from the LSP specification. It checks the validity of a rename so that users won't get a prompt for renaming lexemes such as a keyword (like let) or a built-in identifier (like int).


  • 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 Heitor Toledo Lassarote de Paula

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