Hi all, It came to our attention that people have started using coroutines <https://en.cppreference.com/w/cpp/language/coroutines.html> in WebKit codebase. Unfortunately, coroutines have semantics that are incompatible with safer C++ rules.
We rely on local variables in a function to be stored in stack, and not heap. This is not the case with a coroutines. To make the situation worse, a regular function can call a coroutines function without itself being a coroutines. This fundamentally breaks the transitive guarantee of semantics safer C++ relies on. Therefore, we propose to ban the use of coroutines in WebKit codebase until we can figure out a way to accommodate the semantics of coroutines in the safer C++ static analysis. - R. Niwa
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