Macro sugars::cvec

macro_rules! cvec {
    ($($tokens: tt)+) => { ... };
}

Build Vec from collection iterator comprehensions.

Limitations

• Only 3 nested comprehensions

Examples:

use sugars::cvec;

let w = cvec![x; x in 1..10];
let z = cvec![x; x in 1..10, if x%2 == 0];