The only way the IDE can tell you is if the language tells it, or it guesses - and if it guesses then it will get it wrong sometimes. Which things are async or not is exactly the kind of thing that needs to be part of the language definition, so that all tools will agree about it and you won't have functions that are async in one IDE and not another, or async in a profiler but not an IDE, or...
The only way the IDE can tell you is if the language tells it, or it guesses - and if it guesses then it will get it wrong sometimes. Which things are async or not is exactly the kind of thing that needs to be part of the language definition, so that all tools will agree about it and you won't have functions that are async in one IDE and not another, or async in a profiler but not an IDE, or...