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CameLIGO: support for `let mut`, assignment and iteration

E. Rivas requested to merge er433/update/let-mut into dev

Motivation and Context


We update and add support for let mut, as in !2254 (merged) (which was later reverted).

A difference with previous MR is that we use upto instead of to in order to prevent breaking all contracts.


  • 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)


Add mutable variables, the assignment operator, for loops, and while loops to CameLIGO.

let do_something g n = 
  let mut x = 1 in
  for j = 1 upto n do
    while x < 10 do
      x := g i j x;


  • 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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