Not able to build optimizer due to Cargo (editions are unstable)

[alejandroastudillo]

Describe the bug

After updating OpEn to version 0.2.0 (via pip), I am getting the following error:

INFO:root:Building optimizer

Caused by:
  editions are unstable

Caused by:
  feature `edition` is required

this Cargo does not support nightly features, but if you
switch to nightly channel you can add
`cargo-features = ["edition"]` to enable this feature
Traceback (most recent call last):
  File "rosenbrock.py", line 28, in <module>
    builder.build()
  File "/home/alejandro/.conda/envs/OpEn/lib/python3.6/site-packages/opengen/builder/optimizer_builder.py", line 530, in build
    self.__build_optimizer()             # build overall project
  File "/home/alejandro/.conda/envs/OpEn/lib/python3.6/site-packages/opengen/builder/optimizer_builder.py", line 394, in __build_optimizer
    raise Exception('Rust build failed')
Exception: Rust build failed

To Reproduce

Steps to reproduce the behavior:

1. I am just trying to run the rosenbrock example, with some minor modification in SolverConfiguration options:

   
   import opengen as og
   import casadi as cs

Build parametric optimizer

------------------------------------

u = cs.SX.sym("u", 5) p = cs.SX.sym("p", 2) phi = og.functions.rosenbrock(u, p) c = cs.vertcat(1.5 * u[0] - u[1], cs.fmax(0.0, u[2] - u[3] + 0.1)) bounds = og.constraints.Ball2(None, 1.5) problem = og.builder.Problem(u, p, phi) \ .with_penalty_constraints(c) \ .with_constraints(bounds) build_config = og.config.BuildConfiguration() \ .with_build_directory("python_test_build") \ .with_build_mode("debug") \ .with_tcp_interface_config() meta = og.config.OptimizerMeta() \ .with_optimizer_name("tcp_enabled_optimizer") solver_config = og.config.SolverConfiguration() \ .with_lfbgs_memory(15) \ .with_tolerance(1e-5) \ .with_max_inner_iterations(155)

builder = og.builder.OpEnOptimizerBuilder(problem, meta, build_config, solver_config) builder.build()

Use TCP server

------------------------------------

mng = og.tcp.OptimizerTcpManager('python_test_build/tcp_enabled_optimizer') mng.start()

mng.ping() solution = mng.call([1.0, 50.0]) print(solution)

mng.kill()

2. See error:

python rosenbrock.py INFO:root:Initialising builder INFO:root:Checking user parameters INFO:root:Creating necessary folders INFO:root:Copying icasadi interface to target directory INFO:root:Generating Cargo.toml for target optimizer INFO:root:Generating icasadi Rust library file INFO:root:Defining CasADi functions and generating C code INFO:root:Defining function psi(u, xi, p) and its gradient INFO:root:Function psi and its gradient (C code) INFO:root:Defining function F1(u, p) INFO:root:Mapping F1 (C code) INFO:root:Defining function F2(u, p) INFO:root:Mapping F2 (C code) INFO:root:Generating casadi_memory.h INFO:root:Generating intercafe.c (C interface) INFO:root:Generating main code for target optimizer (lib.rs) INFO:root:Generating build.rs for target optimizer INFO:root:Generating YAML configuration file INFO:root:Building optimizer

Caused by: editions are unstable

Caused by: feature edition is required

this Cargo does not support nightly features, but if you switch to nightly channel you can add cargo-features = ["edition"] to enable this feature Traceback (most recent call last): File "rosenbrock.py", line 28, in builder.build() File "/home/alejandro/.conda/envs/OpEn/lib/python3.6/site-packages/opengen/builder/optimizer_builder.py", line 530, in build self.build_optimizer() # build overall project File "/home/alejandro/.conda/envs/OpEn/lib/python3.6/site-packages/opengen/builder/optimizer_builder.py", line 394, in build_optimizer raise Exception('Rust build failed') Exception: Rust build failed

**System information:**

 - System/Platform: Intel i7
 - OS: Ubuntu 16.04
 - rustc 1.29.0 (aa3ca1994 2018-09-11)
 - Python 3.6.9
 - rustup show:
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/alejandro/.rustup

stable-x86_64-unknown-linux-gnu (default)
rustc 1.38.0 (625451e37 2019-09-23)

**Additional context**

This error is happening with whatever OCP I try to solve by using OpEn, and didn't happen when using OpEn v.0.1.0.

[alphaville]

@alejandroastudillo This might be because you have an old version of the Rust compiler. The latest version of rustc is 1.38.0. Can you please run:

rustup update

in your terminal and try again?

[alejandroastudillo]

@alphaville I've already tried with rustup update but nothing changed. The problem in the old environment remains, but since I am using conda environments, I just created a new one, installed opengen v.0.2.0 and everything is working fine now.

[alphaville]

I guess Conda caches certain files and this is what gave rise to this issue. I'm glad it works now. I guess I can close this issue now.

[alejandroastudillo]

Thank you very much for your help.