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| author | Anders Kaseorg <andersk@mit.edu> | 2017-07-03 17:18:01 -0400 |
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| committer | Anders Kaseorg <andersk@mit.edu> | 2017-07-03 18:38:53 -0400 |
| commit | d68c3ab17b6f6c3b71d0531063aec8e64098f59c (patch) | |
| tree | a0982968fd07326593d8a54b5e38d59c309fb3a2 /src/test/incremental/thinlto | |
| parent | 734c83642cff23f0d9b4b8f006b05437697bcd91 (diff) | |
| download | rust-d68c3ab17b6f6c3b71d0531063aec8e64098f59c.tar.gz rust-d68c3ab17b6f6c3b71d0531063aec8e64098f59c.zip | |
Document unintuitive argument order for Vec::dedup_by relation
When trying to use dedup_by to merge some auxiliary information from removed elements into kept elements, I was surprised to observe that vec.dedup_by(same_bucket) calls same_bucket(a, b) where b appears before a in the vector, and discards a when true is returned. This argument order is probably a bug, but since it has already been stabilized, I guess we should document it as a feature and move on. (Vec::dedup also uses == with this unexpected argument order, but I figure that’s not important since == is expected to be symmetric with no side effects.) Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Diffstat (limited to 'src/test/incremental/thinlto')
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