1const print = @import("std").debug.print;
 2pub fn main() void {
 3    const optional_number: ?i32 = null;
 4
 5    if (optional_number) |number| {
 6        print("got number: {}\n", .{number});
 7    } else {
 8        print("it's null\n", .{});
 9    }
10}
11
12// exe=succeed