#![no_std] // Allows direct access to core OR Absolute path to core
#![allow(hidden_glob_reexports)]
pub use core::option::*;
use ::core::option::Option;
fn main() {
 // warning suppressed because of `allow`
 let _x: Option<i32> = Some(42);
}

#![warn(hidden_glob_reexports)]
pub use std::option::*;
use ::std::option::Option;
fn main() {
 // Warns when same (current buggy behavior)
 // Even though importing the same item & there is no "shadowing"
 // Should Only warn when a different/private item actually shadows the glob reexport
 let _x: Option<i32> = Some(42);
}

~/rust/build/host/stage1/bin/rustc --edition 2021 fix/before/allow_when_same.rs

~/rust/build/host/stage1/bin/rustc --edition 2021 fix/before/warn_when_same.rs 

./x build --stage 1 # Compiler + standard library + sysroot (complete setup)

#![warn(hidden_glob_reexports)]
pub use std::option::*;
use ::std::option::Option;
fn main() {
 // Should be no warning after fix
 let _x: Option<i32> = Some(42);
}

~/rust/build/host/stage1/bin/rustc --edition 2021 fix/after/not_warn_when_same.rs

#![deny(hidden_glob_reexports)]
pub mod upstream {
 mod inner { pub struct Foo {} pub struct Bar {} }
 pub use self::inner::*;
 struct Foo {} // private item shadows `inner::Foo`
}
// mod downstream {
// fn test() {
// let _ = crate::upstream::Foo; // inaccessible
// }
// }
pub fn main() {}

~/rust/build/host/stage1/bin/rustc --edition 2021 fix/after/should_warn_when_private_shadows_glob.rs

~/rust/build/host/stage1/bin/rustc ~/rust/tests/ui/lint/issue-146164.rs

cd ~/rust # Must be in rust directory first 
./x test tests/ui/lint/issue-146164.rs # Use relative path

cd ~/rust # Must be in rust directory first 
./x test tests/ui/lint/ --test-args="146164"