feat: Implement more assignment rules#1030

Draft

kdy1 wants to merge 7 commits intodudykr:mainfrom kdy1:q1

+74-6

Commits on May 18, 2023

Add a test
kdy1
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Commits on May 19, 2023

Reduce
kdy1
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Fix loop count
kdy1
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Don't use Ok(())
kdy1
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Update test refs
kdy1
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disallow_rest_pat_in_left
kdy1
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Commits on May 20, 2023

WPI
kdy1
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