error[E0152]: found duplicate lang item `panic_impl`
  --> $DIR/duplicate_entry_error.rs:11:1
   |
LL | / fn panic_impl(info: &PanicInfo) -> ! {
LL | |
LL | |     loop {}
LL | | }
   | |_^
   |
   = note: the lang item is first defined in crate `std` (which `duplicate_entry_error` depends on)
   = note: first definition in `std` loaded from SYSROOT/libstd-*.rlib
   = note: second definition in the local crate (`duplicate_entry_error`)

error: aborting due to 1 previous error

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