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`if` statement

^Syntax
IfStatement :
   if Expression{    (Statement | Expression)⁺
   }
   (else {
   (Statement | Expression)⁺
   })^?\

Example:

contract Foo {
    pub fn bar(val: u256) -> u256 {
        if val > 5 {
            return 1
        } else {
            return 2
        }
    }
}

The if statement is used for conditional execution.