[0.2] Fix usage with rustc-dep-of-std
#4167
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Since [1] we use derive macros rather than manually implementing `Clone` and `Copy`. However, this caused the build in `std` to start failing since the `core` prelude is not available. This provides the derive macros as well as `derive` itself. Resolve this by using complete paths. Additionally allow `internal_features` to suppress the warning using `link_cfg`, and change to using global paths for all uses of `core`. Link: rust-lang#4038 [1] (backport <rust-lang#4158>) (cherry picked from commit d69ad56)
Add a test that the crate builds correctly with the configuration that is used in `std`. (backport <rust-lang#4158>) (cherry picked from commit 9839a9a)
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r? @JohnTitor rustbot has assigned @JohnTitor. Use |
This combination raises an error suggesting `&raw mut errno`. This was removed in 1.0, but allow the lint on 0.2 for now.
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Backport #4158