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Rollup merge of rust-lang#68845 - dwrensha:fix-68783, r=estebank
stop using BytePos for computing spans in librustc_parse/parser/mod.rs Computing spans using logic such as `self.token.span.lo() + BytePos(1)` can cause internal compiler errors like rust-lang#68730 when non-ascii characters are given as input. rust-lang#68735 partially addressed this problem, but only for one case. Moreover, its usage of `next_point()` does not actually align with what `bump_with()` expects. For example, given the token `>>=`, we should pass the span consisting of the final two characters `>=`, but `next_point()` advances the span beyond the end of the `=`. This pull request instead computes the start of the new span by doing `start_point(self.token.span).hi()`. This matches `self.token.span.lo() + BytePos(1)` in the common case where the characters are ascii, and it gracefully handles multibyte characters. Fixes rust-lang#68783.
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