System.print(0 << 0) // expect: 0
System.print(1 << 0) // expect: 1
System.print(0 << 1) // expect: 0
System.print(1 << 1) // expect: 2
System.print(0xaaaaaaaa << 1) // expect: 1431655764
System.print(0xf0f0f0f0 << 1) // expect: 3789677024

// Max u32 value.
System.print(0xffffffff << 0) // expect: 4294967295

// TODO: Negative numbers.
// TODO: Floating-point numbers.
// TODO: Numbers that don't fit in u32.