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Internal: add missing case `E_let_mut_in` for contextual expressions checking

E. Rivas requested to merge er433-fix-context-expression into dev

Motivation and Context

Recently it was merged !2795 (merged), which is pretty useful, but in an example I was following in JsLIGO, this checking didn't work, after some debugging, it seems E_let_mut_in case is missing.


This MR adds the case for E_let_mut_in following that one of E_let_in.


  • 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)



  • 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 E. Rivas

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