1 error[E0463]: can't find crate for `core`
2 --> $DIR/missing-std.rs:6:1
4 LL | extern crate core;
5 | ^^^^^^^^^^^^^^^^^^ can't find crate
7 = note: the `x86_64-unknown-uefi` target may not be installed
8 = help: consider downloading the target with `rustup target add x86_64-unknown-uefi`
9 = help: consider building the standard library from source with `cargo build -Zbuild-std`
11 error: requires `sized` lang_item
13 error: aborting due to 2 previous errors
15 For more information about this error, try `rustc --explain E0463`.