1error[E0259]: the name `core` is defined multiple times
2  --> $DIR/weak-lang-item.rs:9:1
3   |
4LL | extern crate core;
5   | ^^^^^^^^^^^^^^^^^^ `core` reimported here
6   |
7   = note: `core` must be defined only once in the type namespace of this module
8help: you can use `as` to change the binding name of the import
9   |
10LL | extern crate core as other_core;
11   |
12
13error: language item required, but not found: `eh_personality`
14
15error: `#[panic_handler]` function required, but not found
16
17error: aborting due to 3 previous errors
18
19For more information about this error, try `rustc --explain E0259`.
20