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30c967ddba
Deduplicate -L search paths For each -L passed to the compiler, we eagerly scan the whole directory. If it has a lot of files, that results in a lot of allocations. So it's needless to do this if some -L paths are actually duplicated (which can happen e.g. in the situation in the linked issue). This PR both deduplicates the args, and also teaches rustdoc not to pass duplicated args to merged doctests. Fixes: https://github.com/rust-lang/rust/issues/145375