no_std project broken after 9/15 nightly

[Visic]

The code below compiles using the 9/15 nightly (nightly-2018-09-15-i686-pc-windows-msvc), but fails to compile since then.

----Code---------------------------------------------------------------------

#![no_std]
#![feature(lang_items, alloc_system, alloc_error_handler)]

extern crate alloc_system;

use alloc_system::System;
use alloc::boxed::Box;
use alloc::vec::Vec;
use core::panic::PanicInfo;

#[global_allocator] static GLOBAL: System = System;
#[alloc_error_handler] #[no_mangle] pub extern "C" fn alloc_error(_: core::alloc::Layout) -> ! { loop {} }
#[panic_handler] #[no_mangle] pub extern "C" fn panic(_info: &PanicInfo) -> ! { loop {} }
#[lang = "eh_personality"] #[no_mangle] pub extern "C" fn eh_personality() {}

#[no_mangle]
pub fn hello_world_in_rust() -> i32 {
    let _: Box<[u8]> = Box::new([0; 10]);
    let _: [i32; 3] = [0,1,2];
    let _: Vec<i32> = Vec::new();
    100
}

----Cargo.toml--------------------------------------------------------------------

[package]
edition = '2018'
name = "test_lib"
version = "0.1.0"
authors = (removed)

[lib]
name = "test_lib"
path = "src/lib.rs"
crate-type = ["staticlib"]

[dependencies]

----Build Output---------------------------------------------------------------------

PS D:\Dev\MyProjects\Rust\test_lib> cargo build --release
Compiling test_lib v0.1.0 (D:\Dev\MyProjects\Rust\test_lib)
error[E0433]: failed to resolve. Could not find alloc in {{root}}
--> src/lib.rs:7:5
|
7 | use alloc::boxed::Box;
| ^^^^^ Could not find alloc in {{root}}

error[E0433]: failed to resolve. Could not find alloc in {{root}}
--> src/lib.rs:8:5
|
8 | use alloc::vec::Vec;
| ^^^^^ Could not find alloc in {{root}}

error[E0432]: unresolved import alloc_system
--> src/lib.rs:6:5
|
6 | use alloc_system::System;
| ^^^^^^^^^^^^ Did you mean self::alloc_system?

error[E0433]: failed to resolve. Use of undeclared type or module Box
--> src/lib.rs:18:24
|
18 | let _: Box<[u8]> = Box::new([0; 10]);
| ^^^ Use of undeclared type or module Box

error[E0433]: failed to resolve. Use of undeclared type or module Vec
--> src/lib.rs:20:23
|
20 | let _: Vec = Vec::new();
| ^^^ Use of undeclared type or module Vec

error[E0412]: cannot find type Box in this scope
--> src/lib.rs:18:12
|
18 | let _: Box<[u8]> = Box::new([0; 10]);
| ^^^ not found in this scope
help: possible candidates are found in other modules, you can import them into scope
|
6 | use std::boxed::Box;
|
6 | use std::prelude::v1::Box;
|

error[E0412]: cannot find type Vec in this scope
--> src/lib.rs:20:12
|
20 | let _: Vec = Vec::new();
| ^^^ not found in this scope
help: possible candidates are found in other modules, you can import them into scope
|
6 | use std::prelude::v1::Vec;
|
6 | use std::vec::Vec;
|

warning: unused import: alloc::boxed::Box
--> src/lib.rs:7:5
|
7 | use alloc::boxed::Box;
| ^^^^^^^^^^^^^^^^^
|
= note: #[warn(unused_imports)] on by default

warning: unused import: alloc::vec::Vec
--> src/lib.rs:8:5
|
8 | use alloc::vec::Vec;
| ^^^^^^^^^^^^^^^

error[E0152]: duplicate lang item found: oom.
--> src/lib.rs:12:37
|
12 | #[alloc_error_handler] #[no_mangle] pub extern "C" fn alloc_error(_: core::alloc::Layout) -> ! { loop {} }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: first defined in crate std.

error[E0152]: duplicate lang item found: panic_impl.
--> src/lib.rs:13:31
|
13 | #[panic_handler] #[no_mangle] pub extern "C" fn panic(_info: &PanicInfo) -> ! { loop {} }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: first defined in crate std.

error[E0152]: duplicate lang item found: eh_personality.
--> src/lib.rs:14:41
|
14 | #[lang = "eh_personality"] #[no_mangle] pub extern "C" fn eh_personality() {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: first defined in crate panic_unwind.

error: aborting due to 10 previous errors

Some errors occurred: E0152, E0412, E0432, E0433.
For more information about an error, try rustc --explain E0152.
error: Could not compile test_lib.

To learn more, run the command again with --verbose.

[jonas-schievink]

probably caused by #54116 and not a bug

[Visic]

Thanks for your help @jonas-schievink I wound up needing to add an extern crate for alloc and change some "use" statements around a little. I should have guessed the extern crate because of the "Could not find alloc in {{root}}" message, but the "duplicate lang item" ... "note: first defined in crate std" lead me to assume there was some sort of bug, since I should have no reference to std to begin with.

#![no_std]
#![feature(lang_items, alloc_system, alloc_error_handler, alloc)]

extern crate alloc_system;
extern crate alloc;

use crate::alloc_system::System;
use crate::alloc::boxed::Box;
use crate::alloc::vec::Vec;
use core::panic::PanicInfo;