duplicate lang item `panic_impl'

[sarocu]

What happened?

Compiling a simple guest example fails with:

error[E0152]: found duplicate lang item `panic_impl`
   --> /home/sarocu/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyperlight-guest-bin-0.12.0/src/lib.rs:139:1
    |
139 | / fn panic(info: &core::panic::PanicInfo) -> ! {
140 | |     _panic_handler(info)
141 | | }
    | |_^
    |
    = note: the lang item is first defined in crate `std` (which `tracing` depends on)
    = note: first definition in `std` loaded from /home/sarocu/.rustup/toolchains/1.89-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-099ea48a26be4ce8.rlib
    = note: second definition in the local crate (`hyperlight_guest_bin`)

Dependencies:

[dependencies]
hyperlight-common = "0.12.0"
hyperlight-guest = "0.12.0"
hyperlight-guest-bin = "0.12.0"
hyperlight-guest-tracing = "0.12.0"

Rust:

cargo --version
cargo 1.89.0 (c24e10642 2025-06-23)

What did you expect to happen?

Successful build

Steps to reproduce the behavior

1. Install the shared dependencies in a new project
2. Copy the example snippet for a guest hyperlight binary in the README
3. cargo build

Hyperlight Version

0.12.0

OS version

             /////////////                
         /////////////////////            -------------
      ///////*767////////////////         OS: Pop!_OS 24.04 LTS x86_64
    //////7676767676*//////////////       Kernel: 6.17.9-76061709-generic
   /////76767//7676767//////////////      Uptime: 3 hours, 32 mins
  /////767676///*76767///////////////     Packages: 2082 (dpkg), 13 (flatpak)
 ///////767676///76767.///7676*///////    Shell: bash 5.2.21
/////////767676//76767///767676////////   Resolution: 3440x1440
//////////76767676767////76767/////////   DE: COSMIC
///////////76767676//////7676//////////   Theme: adw-gtk3 [GTK3]
////////////,7676,///////767///////////   Icons: Cosmic [GTK3]
/////////////*7676///////76////////////   Terminal: cosmic-term
///////////////7676////////////////////   CPU: AMD Ryzen 7 3700X (16) @ 3.800GHz
 ///////////////7676///767////////////    GPU: NVIDIA 09:00.0 NVIDIA Corporation Device 2d04
  //////////////////////'////////////     Memory: 8201MiB / 31999MiB
   //////.7676767676767676767,//////
    /////767676767676767676767/////
      ///////////////////////////
         /////////////////////
             /////////////

Additional Information

No response

[ludfjig]

Hello and thanks for the report! Would you mind speciying exactly how you compiled the guest? We mostly use cargo-hyperlight to build guests which automatically sets up certain things. Have you tried cargo hyperlight build instead, which I also think is what our README uses?

[jsturtevant]

What does your guest look like? you will need to have: (see https://github.com/hyperlight-dev/hyperlight?tab=readme-ov-file#guest)

#![no_std]
#![no_main]
extern crate alloc;

There are some additional settings required to build and link everything properly. The easiest way to get it built is:

cargo install --locked cargo-hyperlight
cargo hyperlight build

if your still having trouble, if you could provider a minimal example and the command you ran that would help