Your reading of the spec is correct; `({x}) = 1` is disallowed. And indeed
every major engine disallows it.Esprima just has a bug. See e.g. https://github.com/jquery/esprima/issues/1164. Shift gets this; so do acorn and babylon <https://astexplorer.net/#/gist/e8ff5de6b9c8c56e00b6b654cc84a0f9/7ef6401d8b4ce934da425095c8662637edf6707e> .
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