[swift-evolution] define backslash '\' as a operator-head in the swift grammar

[Chris Lattner]

> On Feb 5, 2017, at 7:29 AM, Nicolas Fezans via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Dear all,
> 
> This is a rather simple proposal to add '\' (backslash character) as a valid operator-head in the swift grammar.

+1 from me, I agree with downthread comments that it would be really really really great to get the unicode operator situation sorted out in Swift 4.

-Chris