Jazzy: following new rclrs install instructions — examples + my ament_cargo package fail (crates.io resolution + rosidl_runtime_rs mismatch)

[esteve]

Discussed in #586

^{Originally posted by olingo99 January 20, 2026}
Hello,

I tried to follow the new installation/build instructions for rclrs v0.7 on ROS 2 Jazzy, but I’m hitting build failures both for the examples and for my own minimal package.

1) Examples workspace failure

In a fresh workspace following the Jazzy instructions:

git clone https://github.com/ros2-rust/rosidl_rust.git src/rosidl_rust
git clone -b jazzy https://github.com/ros2/common_interfaces.git src/common_interfaces
git clone -b jazzy https://github.com/ros2/example_interfaces.git src/example_interfaces
git clone -b jazzy https://github.com/ros2/rcl_interfaces.git src/rcl_interfaces
git clone -b jazzy https://github.com/ros2/unique_identifier_msgs.git src/unique_identifier_msgs
git clone https://github.com/ros2-rust/examples.git src/examples

colcon build fails with:

--- stderr: examples_rclrs_message_demo
error: no matching package named `rclrs_example_msgs` found
location searched: crates.io index
required by package `examples_rclrs_message_demo v0.5.0 (.../src/examples/rclrs/message_demo)`
---
Failed   <<< examples_rclrs_message_demo

2) Minimal package failure (std_msgs::msg::String subscriber)

In my minimal workspace (same packages as before but without the examples repo), colcon build fails with:

--- stderr: rust
error: failed to select a version for the requirement `std_msgs = "*"`
  version 4.2.3 is yanked
location searched: crates.io index
required by package `rust v0.1.0 (.../src/rust)`
---

In both cases .cargo/config.toml is effectively empty and only contains:

[patch.crates-io]

3) After adding rosidl_core & rosidl_defaults

Additionally, if I add rosidl_core and rosidl_defaults (Jazzy branches), then .cargo/config.toml gets populated and message crates are resolved locally (e.g., install/std_msgs/share/std_msgs/rust). However, my node then fails to compile due to a rosidl_runtime_rs version mismatch:

error[E0277]: the trait bound `std_msgs::msg::String: MessageIDL` is not satisfied
    --> src/timer_pub_count.rs:8:11
     |
   8 |     _pub: Publisher<std_msgs::msg::String>,
     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `MessageIDL` is not implemented for `std_msgs::msg::String`
     |
note: there are multiple different versions of crate `rosidl_runtime_rs` in the dependency graph
    --> /home/theo/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rosidl_runtime_rs-0.6.0/src/traits.rs:132:1
     |
 132 | pub trait Message: Clone + Debug + Default + 'static + Send + Sync {
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is the required trait
     |
    ::: src/timer_pub_count.rs:3:5
     |
   3 | use rclrs::*;
     |     ----- one version of crate `rosidl_runtime_rs` used here, as a dependency of crate `rclrs`
...
   8 |     _pub: Publisher<std_msgs::msg::String>,
     |                     -------- one version of crate `rosidl_runtime_rs` used here, as a dependency of crate `std_msgs`
     |
    ::: /home/theo/rclrs07/workspace_minimal/install/std_msgs/share/std_msgs/rust/src/msg.rs:2817:1
     |
2817 | pub struct String {
     | ----------------- this type doesn't implement the required trait
     |
    ::: /home/theo/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rosidl_runtime_rs-0.5.0/src/traits.rs:24:1
     |
  24 | pub trait SequenceAlloc: Sized {
     | ------------------------------ this is the found trait
     = help: you can use `cargo tree` to explore your dependency tree
note: required by a bound in `PublisherState`
    --> /home/theo/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rclrs-0.7.0/src/publisher.rs:106:8
     |
 104 | pub struct PublisherState<T>
     |            -------------- required by a bound in this struct
 105 | where
 106 |     T: Message,
     |        ^^^^^^^ required by this bound in `PublisherState`

Has anyone managed to make rclrs v0.7 work on Jazzy using the current installation steps?

Thanks.

[mendes-jose]

I'm getting the same behavior on jazzy and on humble. I'm searching for a solution too

[esteve]

@mendes-jose can you check if the changes in the documentation in #589 help? The original poster @olingo99 has confirmed that following the instructions there solved the issue #586 (reply in thread)

[mendes-jose]

Thanks @esteve, adding the missing repos/packages (following the updated redme) has fixed the compilation for jazzy on my end

However, I'm having an issue when building for rolling if following the readme instructions strictly. I'll create a separated issue for that. In short, the issue is related to the std_msgs crate being yanked and the readme not saying you should add common_interfaces to your worksapce for rolling