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Backport !4108 to ghc-8.10

Peter Becich requested to merge peterbecich/ghc:issue18708-ghc-8.10 into ghc-8.10

PmCheck: Desugar string literal patterns with -XRebindableSyntax correctly (#18708 (closed))

I have observed #18708 (closed) using GHC 8.10.7. This was the error: https://github.com/google/codeworld/pull/1522#issue-995656828 I have tested this backport; it solves the error.

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