Make Let-Pattern desugaring less brittle #3268
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The old code relies on the Parser inserting PositionedValue wrappers in certain places, so that some patterns miss. I wrote this code a while back with @paf31, when we were trying to add SourceSpans to Binders and Exprs.
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The old code relies on the Parser inserting PositionedValue wrappers in certain
places, so that some patterns miss. I wrote this code a while back with @paf31,
when we were trying to add SourceSpans to Binders and Exprs.