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// run
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"strings"
"unsafe"
)
func shift[T any]() int64 {
return 1 << unsafe.Sizeof(*new(T))
}
func div[T any]() uintptr {
return 1 / unsafe.Sizeof(*new(T))
}
func add[T any]() int64 {
return 1<<63 - 1 + int64(unsafe.Sizeof(*new(T)))
}
func main() {
shift[[62]byte]()
shift[[63]byte]()
shift[[64]byte]()
shift[[100]byte]()
shift[[1e6]byte]()
add[[1]byte]()
shouldPanic("divide by zero", func() { div[[0]byte]() })
}
func shouldPanic(str string, f func()) {
defer func() {
err := recover()
if err == nil {
panic("did not panic")
}
s := err.(error).Error()
if !strings.Contains(s, str) {
panic("got panic " + s + ", want " + str)
}
}()
f()
}
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