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Rollup merge of rust-lang#81869 - mark-i-m:leading-vert, r=petrochenkov
Simplify pattern grammar, improve or-pattern diagnostics This implements the change under FCP in rust-lang#81415. It allows nested or-patterns to contain a leading `|`, simplifying the [grammar for patterns](https://github.com/rust-lang/reference/pull/957/files?short_path=cc629f1#diff-cc629f15712821139bc706c63b3845ab59a008e2a998e08ffad42e3aebcbcbe2). Along the way, we also improve the diagnostics around a few specially-handled cases, such as using `||` instead of `|`, using or-patterns in fn params, including the leading `|` in the pattern span, etc. r? `@petrochenkov`
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