Both Rust and C++ are powerful programming languages that have their strengths and weaknesses. Here are some downsides of each language:

C++:

- Memory management: C++ uses manual memory management, which means that the programmer must manage memory explicitly. This can lead to memory issues such as memory leaks, 
segmentation faults, and dangling pointers. However, C++ provides tools like smart pointers and containers to mitigate these issues.
- Complexity: C++ is a complex language that has a steep learning curve. It has many features and syntax that can be overwhelming for beginners.
- Compatibility issues: C++ lacks a standard ABI (application binary interface), which means that different compilers can generate incompatible code. This can lead to compatibility issues when linking with external libraries.

Rust:

- Learning curve: Rust has a steep learning curve due to its unique ownership and borrowing model, which can be challenging to understand for programmers coming from other languages.
- Tooling: Rust's tooling is not as mature as some other languages. This means that some features, such as code completion and debugging, can be less robust compared to other languages.
- Performance overhead: Rust's focus on safety comes at a cost of performance overhead, particularly in cases where programs use a lot of pointer manipulation. However, Rust is still generally faster than languages like Python or JavaScript.


Overall, both languages have their trade-offs, and the choice between them depends on the specific requirements of the project and the preferences of the developer.
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