error[E0152]: found duplicate lang item `panic_impl`
  --> $DIR/panic-handler-std.rs:8:1
   |
LL | / fn panic(info: PanicInfo) -> ! {
LL | |     loop {}
LL | | }
   | |_^
   |
   = note: the lang item is first defined in crate `std` (which `panic_handler_std` depends on)
   = note: first definition in `std` loaded from SYSROOT/libstd-*.rmeta
   = note: second definition in the local crate (`panic_handler_std`)

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0152`.