[Bug]: Function rest param is not set as final

[LakshanWeerasinghe]

Description

$subject

According to the spec every parameter in the function should be final. But right now, the rest parameter can change. This means developers can modify them, which shouldn't happen according to the spec.

After the fix it should give a compile time error saying.

cannot assign a value to function argument 'restParam'(BCE2549)

Steps to Reproduce

function name(string param1, string... rest) {
    rest = ["value"]; // no error
}

Affected Version(s)

2201.8.2

OS, DB, other environment details and versions

No response

Related area

-> Compilation

Related issue(s) (optional)

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Suggested label(s) (optional)

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Suggested assignee(s) (optional)

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[github-actions]

This issue is NOT closed with a proper Reason/ label. Make sure to add proper reason label before closing. Please add or leave a comment with the proper reason label now.

      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
      - Reason/MultipleComponentInteraction - Issue occured due to interactions in multiple components.
      - Reason/Complex - Issue occurred due to complex scenario.
      - Reason/Invalid - Issue is invalid.
      - Reason/Other - None of the above cases.