[Pitch] if and switch expressions

[jeremyabannister (Jeremy Bannister)]

@John_McCall

If we need a solution for this, I think we either need to accept final-expression production:

var x = if value == 0 {
    print("zero")
    true
  } else {
    false
  }

One thing that I think makes me uneasy about the final-expression thing is that this code is has been valid and common Swift for a few years:

VStack {
    if someCondition {
        producesSomeView()
        producesAnotherView()
    } else {
        aDifferentView()
    }
}

and it is to be read in a fundamentally different way than this very similar looking newly-proposed code:

var backgroundColor: Color {
    if someCondition {
        vaguelyNamedFunctionThatMightReturnAValue()
        otherFunctionDoesWhoKnowsWhat()
        theOneAndOnlyReturnValue()
    } else {
        theOtherReturnValue()
    }
}