Allow compiler control statements in container literals

[xAlien95 (Stefano De Carolis)]

Probably this one?

'#if' for postfix member expressions

Hi all, Here's a pitch for a feature that expands #if functionality to postfix member expressions. I'll keep an update-version of this proposal here. Implementation is here #if for postfix member expressions Swift has conditional compilation block #if ... #endif which allows code to be conditionally compiled depending on the value of one or more compilation conditions. Currently, unlike #if in C family languages, the body of each clause must surround complete statements. However, in some case…