List Sugar
The List Sugar replaces an expression such as:
    x := (list a b c nil);
With:
    x := cons a cons b cons c cons nil;



Else Sugar
The Else Sugar allows you to ommit the 'else' keyword in if commands;
A command such as:
    if expr then
        Commands

Will compile into:
    if expr then
        Command
    else
        x := x


Case Sugar
The Case Sugar is a Pattern Matching Command.
Syntax:
    case expr of
        Pattern(1) => Command(1);
        Pattern(2) => Command(2);
        ...
        Pattern(n) => Command(n)

The Execution of the Command is as follows:
  1. Compute expr and save its value: E
  2. Scan Patterns(1..n) in the order they are written until finding the first pattern which the matches E
  3. Once Pattern( i ) is found, assign all its variables with the right subtrees
  4. Execute Command( i )


Booleans Sugar
The Booleans Sugar allows you to use the keywords: true and false as boolean literals.
     false will compile into  nil
     true  will compile into (nil)