1 error[E0259]: the name `core` is defined multiple times
2 --> $DIR/weak-lang-item.rs:9:1
4 LL | extern crate core;
5 | ^^^^^^^^^^^^^^^^^^ `core` reimported here
7 = note: `core` must be defined only once in the type namespace of this module
8 help: you can use `as` to change the binding name of the import
10 LL | extern crate core as other_core;
13 error: `#[panic_handler]` function required, but not found
15 error: language item required, but not found: `eh_personality`
17 = note: this can occur when a binary crate with `#![no_std]` is compiled for a target where `eh_personality` is defined in the standard library
18 = help: you may be able to compile for a target that doesn't need `eh_personality`, specify a target with `--target` or in `.cargo/config`
20 error: aborting due to 3 previous errors
22 For more information about this error, try `rustc --explain E0259`.