Remove unneeded prelude imports in libcore tests #66894
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These three lines are from c82da7a in 2015. They cause problems when applying rustfmt to the codebase, because reordering wildcard imports can trigger new unused import warnings. As a minimized example, the following program compiles successfully: #![deny(unused_imports)] use std::fmt::Debug; use std::marker::Send; pub mod repro { use std::prelude::v1::*; use super::*; pub type D = dyn Debug; pub type S = dyn Send; } pub type S = dyn Send; but putting it through rustfmt produces a program that fails to compile: #![deny(unused_imports)] use std::fmt::Debug; use std::marker::Send; pub mod repro { use super::*; use std::prelude::v1::*; pub type D = dyn Debug; pub type S = dyn Send; } pub type S = dyn Send; The error is: error: unused import: `std::prelude::v1::*` --> src/main.rs:8:9 | 8 | use std::prelude::v1::*; | ^^^^^^^^^^^^^^^^^^^
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Remove unneeded prelude imports in libcore tests These three lines are from c82da7a dating back to 2015. They cause problems when applying rustfmt to the codebase, because reordering wildcard imports can trigger new unused import warnings. As a minimized example, the following program compiles successfully: ```rust #![deny(unused_imports)] use std::fmt::Debug; use std::marker::Send; pub mod repro { use std::prelude::v1::*; use super::*; pub type D = dyn Debug; pub type S = dyn Send; } pub type S = dyn Send; ``` but putting it through rustfmt produces a program that fails to compile: ```rust #![deny(unused_imports)] use std::fmt::Debug; use std::marker::Send; pub mod repro { use super::*; use std::prelude::v1::*; pub type D = dyn Debug; pub type S = dyn Send; } pub type S = dyn Send; ``` The error is: ```console error: unused import: `std::prelude::v1::*` --> src/main.rs:8:9 | 8 | use std::prelude::v1::*; | ^^^^^^^^^^^^^^^^^^^ ```
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Rollup of 9 pull requests Successful merges: - #66612 (Initial implementation of or-pattern usefulness checking) - #66705 (Atomic as_mut_ptr) - #66759 (impl TrustedLen for vec::Drain) - #66858 (Use LLVMAddAnalysisPasses instead of Rust's wrapper) - #66870 (SimplifyArmIdentity only for locals with the same type) - #66883 (rustc_typeck: gate AnonConst's generics on feature(const_generics).) - #66889 (Make python-generated source files compatible with rustfmt) - #66894 (Remove unneeded prelude imports in libcore tests) - #66895 (Feature gating *declarations* => new crate `rustc_feature`) Failed merges: - #66905 (rustc_plugin: Remove some remaining plugin features) r? @ghost
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These three lines are from c82da7a dating back to 2015.
They cause problems when applying rustfmt to the codebase, because reordering wildcard imports can trigger new unused import warnings.
As a minimized example, the following program compiles successfully:
but putting it through rustfmt produces a program that fails to compile:
The error is: