[imetatroll]

Sounds like the solution probably had something to do with switching to passing by reference + other changes I would assume.

[intelVISA]

A big pain point for using coroutines is having to pass-by-value more frequently due to uncertain lifetimes.. it's jarring when you come from zero copy programming.

[cbrogrammer]

That is what many people fail to understand as to why us C programmers dislike C++

[pjmlp]

Indeed, because languages with reference parameters preceed C for about 15 years, and are present in most ALGOL derived dialects.