allow hint with warning

[zhiyong1997]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @zhiyong1997, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request modifies the error handling strategy within the MPISharedMemory trait implementation for Kernel objects. Previously, the presence of a hint_solver would lead to an immediate program termination via an assert!. With this change, the system will now issue a warning to stderr and continue execution, effectively allowing Kernel objects with hint_solvers to be used with shared memory, albeit with the hint_solver being ignored. This provides more robust behavior by preventing crashes in scenarios where a hint_solver might be unexpectedly present.

Highlights

• Error Handling: Replaced assert! statements with eprintln! warnings when a hint_solver is encountered in MPISharedMemory implementations for Kernel's bytes_size and to_memory methods.
• hint_solver Behavior: The system will now issue a warning and ignore the hint_solver when using MPISharedMemory for Kernel instead of causing a program panic.

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[gemini-code-assist]

Code Review

This pull request improves robustness by replacing a panic with a warning when a Kernel with a hint_solver is used with MPISharedMemory. The change is sound, as it allows the program to continue by ignoring the unsupported feature. My review includes suggestions to make the code more idiomatic and to address code duplication for better maintainability.