Why is this an issue?

The suspend function modifier is used to mark a function which might take some time to execute and could suspend the caller coroutine. The location where such function is called is a "suspension point". Functions marked as suspend ("suspending functions") should themselves contain at least one suspension point, otherwise it makes no sense to mark it as suspend

This rule reports an issue if a function with suspend modifier has no calls to other suspend functions inside its body.

Noncompliant code example

suspend fun function() { // Noncompliant, redundant 'suspend' modifier
    println("Hello!")
}

Compliant solution

fun function() {
    println("Hello!")
}

Resources

• Coroutines guide