[swift-evolution] if case 1, 2, 3 = x { ... } results in error in swift 2

[Kevin Ballard]

`if case 1, 2, 3 = x {` does not work because case statements can only
contain a single pattern when used in an if/for/while. Only when found
in `switch` statements can they contain multiple comma-separated
patterns.

`if case 1...3 = x {` works because this a single pattern `1...3`, and
it's equivalent to saying `if 1...3 ~= x {` (`~=` is the operator that
is used for doing value comparisons in patterns, and it's implemented
for all `IntervalType`s to call `interval.contains(x)`).

Also, this seems like a question that's more appropriate for swift-users
than swift-evolution.

On Thu, Dec 3, 2015, at 04:40 PM, Amir Michail wrote:
> But "if case 1...3 = x { ... }" works.
>  
> Why?
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