It sort of goes against Rust’s philosophy to bake anything like that into the language.
Where they screwed up was not providing the machinery to make libraries agnostic of the runtime an end user wants to use in their program, so libraries either depend on a specific runtime explicitly or use features to allow users to switch runtimes at compile time. This causes a lot of headaches for library maintainers and end users both.
There’s a lot of interest in adding said machinery (through collections of traits in std) to enable libraries to be generic over different runtimes, but a solution is still some ways off.
Where they screwed up was not providing the machinery to make libraries agnostic of the runtime an end user wants to use in their program, so libraries either depend on a specific runtime explicitly or use features to allow users to switch runtimes at compile time. This causes a lot of headaches for library maintainers and end users both.
There’s a lot of interest in adding said machinery (through collections of traits in std) to enable libraries to be generic over different runtimes, but a solution is still some ways off.