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由 Manish Goregaokar 提交于
Revert "Remove unused methods from MultiSpan" This reverts commit f7019a4e. That commit removed the only way to make a suggestion with more than one substitute. That feature is not used directly by rustc but exists and is used by Clippy. Bring it back until we come up with a better solution (suggestions don't use span labels, so it would make sense for them to use their own type). Rational there: https://github.com/Manishearth/rust-clippy/pull/1119. r? @jonathandturner Cc @Manishearth
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