fn main() {
// Syntax: <linkage-qualifier> var <name>: <type> ; | = <value>;
// Always mutable, complete variable definition.
var my_first_var: i64 = 0;
// Variable mutation.
my_first_var = 123;
// Variable definition without value.
var my_second_var: bool;
// Variable mutation.
my_second_var = true;
// Variable with public linkage. It's only allowed inside the classes.
public var my_first_var: i64 = 0;
}