Suppress "discarded non-Unit value" warning
I have added the scalac command line argument -Ywarn-value-discard to my build because this would have caught a subtle bug that I just found in my code. However, I now get some warnings for "discarded non-Unit value" that are about intentional discards, not bugs. How do I suppress those warnings?
Answer
You suppress these warning by explictly returning unit (that is ()).
By example turn this:
def method1() = {
println("Hello")
"Bye"
}
def method2() {
method1() // Returns "Bye", which is implicitly discarded
}
into:
def method1() = {
println("Hello")
"Bye"
}
def method2() {
method1()
() // Explicitly return unit
}