Ehm, not sure I understood, but I'd say no. Defer is just code that is executed in reverse order upon return from a fuction. It has nothing to do with coroutines. It's a cleaner way to write the usual C syntax of "goto cleanup_x" code.

Go coroutines (goroutines) are functions invoked with the "go" keyword. These cannot be stopped or resumed, but might be (possibly) executed on a different thread. In any case, they are not guaranteed to be executed immediately in the normal flow of the code.