Treatment of nested 'break'

[Guy Steele]

> On May 10, 2018, at 3:57 PM, Kevin Bourrillion <kevinb at google.com> wrote:
> 
> I'm just going to say that naming a keyword as the argument of another keyword seems novel and unprecedented for Java, and as such I think should require pretty strong justification.

I concur.  Note that “case x, default ->” has the same property: it causes the `default` keyword to be an “argument” of the `case` keyword.  I kind of lean against doing such things.

However, if we are going to explore that part of the design space, I just wanted to point out that “return switch a;” has at least one advantage relative to “break switch a;”.