Toplevel 'let' binding can be left permanently uninitialized after an error

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<CANEHTz-db0S_JptCa-0HEeQrTk==SnZYKY9DVYvNXaMF_tri3A at mail.gmail.com> edit code:

This's subject is <Re: Toplevel 'let' binding can be left permanently
uninitialized after an error>.