Issue Description:

I wasn't sure whether to report this here or in the Bug Reporter, since #colorLiteral is part of the STL, but is implemented only for UIColor. If it has to go to Bug Reporter, please inform me.

Explicitly writing a color literal or pasting it with code

#colorLiteral(red: x, green: y, blue: z, alpha: 1.0)

will produce a color with the following components:

red   = (x > 0 && x <= 1) ? 1 : 0
green = (y > 0 && y <= 1) ? 1 : 0
blue  = (z > 0 && z <= 1) ? 1 : 0

So, for instance, this produces pure red:

#colorLiteral(red: 34.0/255.0, green: 0.0, blue: 0.0, alpha: 1.0)

This – pure magenta:

#colorLiteral(red: 34.0/255.0, green: 0.0, blue: 71.0/255.0, alpha: 1.0)

And this – pure white:

#colorLiteral(red: 34.0/255.0, green: 3.0/255.0, blue: 71.0/255.0, alpha: 1.0)

In other words, if any of the color components is > 0 and <= 1, the result will be a color with that component equal to 1.