1 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
2 --> $DIR/feature-gate-extern_crate_item_prelude.rs:26:9
7 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
9 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
10 --> $DIR/feature-gate-extern_crate_item_prelude.rs:28:9
12 LL | use alloc::boxed;
15 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
17 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
18 --> $DIR/feature-gate-extern_crate_item_prelude.rs:33:11
23 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
25 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
26 --> $DIR/feature-gate-extern_crate_item_prelude.rs:35:11
28 LL | use ::alloc::boxed;
31 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
33 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
34 --> $DIR/feature-gate-extern_crate_item_prelude.rs:9:17
36 LL | let v = alloc::vec![0];
39 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
41 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
42 --> $DIR/feature-gate-extern_crate_item_prelude.rs:11:18
44 LL | type A = alloc::boxed::Box<u8>;
47 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
49 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
50 --> $DIR/feature-gate-extern_crate_item_prelude.rs:18:19
52 LL | let v = ::alloc::vec![0];
55 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
57 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
58 --> $DIR/feature-gate-extern_crate_item_prelude.rs:20:20
60 LL | type A = ::alloc::boxed::Box<u8>;
63 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
65 error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
66 --> $DIR/feature-gate-extern_crate_item_prelude.rs:42:14
68 LL | type A = core::boxed::Box<u8>;
71 = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
73 error: aborting due to 9 previous errors
75 For more information about this error, try `rustc --explain E0658`.