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Destructuring: Fix array unpacking assignments with holes on RHS (#9412)
This fixes an issue where destructuring assignments eligible for the "array unpacking" optimization would fail to compile when the array literal on the right-hand side of the expression contained holes. Example input: ```js [a, b] = [, 2]; ; // Avoid completion record special case ``` The error message was `Property right of AssignmentExpression expected node to be of a type ["Expression"] but instead got null`. Now the above code compiles to: ```js a = void 0; b = 2; ; ``` This PR also adds a couple of related test cases that were missing, to ensure the change doesn't regress them: * Normal assignment expression with unpacking * Declaration with unpacking and a hole on RHS
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