From the Go language spec: "For signed integers, the operations +, -, *, and << may legally overflow and the resulting value exists and is deterministically de

From the Go language spec: "For signed integers, the operations +, -, *, and << may legally overflow and the resulting value exists and is deterministically defined by the signed integer representation, the operation, and its operands. No exception is raised as a result of overflow. A compiler may not optimize code under the assumption that overflow does not occur. For instance, it may not assume that x < x + 1 is always true." func main() { var foo int8 = 127 fmt.Println(foo + 1) } prints -128