incorrect "warning: unused import" compiling rayon

[cuviper]

I'm getting incorrect warnings compiling Rayon from git (commit 5b27a6c29b01). Many like:

warning: unused import: `super::internal::*;`, #[warn(unused_imports)] on by default
 --> src/par_iter/option.rs:2:5
  |
2 | use super::internal::*;
  |     ^^^^^^^^^^^^^^^^^^^

I only get this using nightly, rustc 1.15.0-nightly (1c448574b 2016-11-28), and it's happy if I remove that import. However, neither stable nor beta have a warning here, and with that removed they get hard errors about unresolved names and traits not in scope.

I do expect we need the imports, so nightly's behavior is surprising.

[bluss]

I'm going to guess that use super::*; (the line before in the file) is now bringing in all symbols the file needs, because globs have changed with now stable feature(item_like_imports).

[cuviper]

Oh... the super also has a use internal::* -- so now that adds to super::*?

OK, I guess this is NOTABUG, but we'll have to figure out how to restructure those imports to work cleanly with both stable and nightly rustc.