Revert "Remove unused methods from MultiSpan" #35094
Merged
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This reverts commit f7019a4.
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