C API throws C++ exceptions

[WilliamVenner]

The C API should not throw C++ exceptions: languages that use the C ABI will likely not have any machinery for properly handling C++ stack unwinds when a C++ exception occurs across an FFI boundary.

For example, the C API crashes Rust programs when a C++ exception occurs:

fatal runtime error: Rust cannot catch foreign exceptions

This makes debugging particularly difficult.

A solution that doesn't require breaking changes would be wrapping all C++ function calls from a C API function (or the entirety of the C API function itself) in a try { ... } catch { ... } and handle any C++ exceptions by printing debugging information, then aborting.

[csukuangfj]

Could you describe which API throws a C++ exception?