[JsLIGO] Allow _ as an expression

Motivation and Context

Since we allow _ as a normal binder, we have to allow it as an expression.

See #1692 (closed)

Description

Component

• 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)

Changelog

Underscore is now accepted everywhere a variable is accepted.

Checklist:

• 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).

added areaFrontend label

assigned to @rinderkn

added 1 commit

• 4710bd35 - [Chore] Increase error recovery cost for wildcard

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mentioned in merge request !2889 (merged)

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• e755591d - [Chore] increase error recovery cost for wildcard

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added 1 commit

• ac380069 - fixup! [Chore] increase error recovery cost for wildcard

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marked this merge request as draft from ac380069

marked this merge request as ready

added 6 commits

• 23be02d7 - Added _ as a parameter in function types.
• 574e7d4d - Modified two test contracts.
• 76d295c9 - Revert "Modified two test contracts."
• 861d68cc - tests: add test case and file
• 9b2d0f97 - style: reformat after re-install
• 1ec8a4b0 - Merge branch 'rinderknecht@fun_type' of gitlab.com:ligolang/ligo into rinderknecht@underscore

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approved this merge request

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added 1 commit

• f7a1dca9 - Added expect test.

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enabled automatic add to merge train when the pipeline for 5a32b68d succeeds

mentioned in commit 5a32b68d

aborted automatic add to merge train because source branch was updated

added 2 commits

• 5a32b68d - Merge branch 'rinderknecht@underscore' into 'dev'
• 3e8cb471 - [Bot] add changelog entry

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added 9 commits

• 3e8cb471...00c4d33d - 8 commits from branch dev
• 462f6d57 - Merge branch 'dev' of gitlab.com:ligolang/ligo into rinderknecht@underscore

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enabled automatic add to merge train when the pipeline for dfc6654b succeeds

aborted automatic add to merge train because source branch was updated

added 2 commits

• 9a57ec5b - 1 commit from branch dev
• e4d68f40 - Merge branch 'dev' of gitlab.com:ligolang/ligo into rinderknecht@underscore

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added 5 commits

• e4d68f40...b0484128 - 4 commits from branch dev
• 6c970a97 - Merge branch 'dev' into rinderknecht@underscore

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enabled automatic add to merge train when the pipeline for b650b70b succeeds

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merged

mentioned in commit 4130f77c