[swift-evolution] Switch statement using blocks for conditions

[Marco Scannadinari]

Hi,

I found it odd that the `label:` style is used for switch-case conditions,
considering that Swift does not have implicit fallthrough. To me the label
style only makes sense if you think of conditions essentially as labels for
a goto statement, which implies fallthrough.

Personally I think this syntax would make more sense:

switch condition {
  case 1 {
    //
  }

  case 2 {
    //
  }
}

This is how Rust implements match, although it is an expression so it
especially applies to that context. Nonetheless I think the above syntax
not only looks a lot nicer but makes more sense, especially since the
current syntax is the only instance where Python-style colons and
indentation are used for designating sections of code rather than braces.

Thoughts?

-Marco
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