Autocompletion during destructuring should not list variables that are already destructured.

[rrousselGit]

Consider the following named record:

const tuple = (value: 42, another: 21);

When using destructuring to create new variables, autocomplete currently keeps suggesting variables that were already assigned.

See:

As you can see, even though we already used :another, the autocompletion keeps suggesting :another. This makes no sense, as final (:another, :another, :value) = tuple is not valid syntax.