Avoid improper spans when `...` or `..=` is recovered from non-ASCII - Fixes https://github.com/rust-lang/rust/issues/155799 Adjusting span endpoints by `BytePos(1)` is almost always bad news. In this case, the code assumed that it was skipping over a single ASCII character. But in the presence of parser recovery from other non-ASCII characters this resulted in an ICE due to bad string indexing when emitting suggestions.
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