The coloring is a property of concurrency safety and whether the language enforces it.
For instance, if you resolve a future in the wrong context you'll still have problems - the coloring is just a compile time error that you are doing things wrong, rather than a runtime deadlock.
For instance, if you resolve a future in the wrong context you'll still have problems - the coloring is just a compile time error that you are doing things wrong, rather than a runtime deadlock.