mirror of
https://github.com/golang/go
synced 2024-11-17 05:04:54 -07:00
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
|
// compile
|
||
|
|
|
||
|
|
// Copyright 2019 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.
|
||
|
|
|
||
|
|
// Test iota inside a function in a ConstSpec is accepted
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"unsafe"
|
||
|
|
)
|
||
|
|
|
||
|
|
// iotas are usable inside closures in constant declarations (#22345)
|
||
|
|
const (
|
||
|
|
_ = iota
|
||
|
|
_ = len([iota]byte{})
|
||
|
|
_ = unsafe.Sizeof(iota)
|
||
|
|
_ = unsafe.Sizeof(func() { _ = iota })
|
||
|
|
_ = unsafe.Sizeof(func() { var _ = iota })
|
||
|
|
_ = unsafe.Sizeof(func() { const _ = iota })
|
||
|
|
_ = unsafe.Sizeof(func() { type _ [iota]byte })
|
||
|
|
_ = unsafe.Sizeof(func() { func() int { return iota }() })
|
||
|
|
)
|
||
|
|
|
||
|
|
// verify inner and outer const declarations have distinct iotas
|
||
|
|
const (
|
||
|
|
zero = iota
|
||
|
|
one = iota
|
||
|
|
_ = unsafe.Sizeof(func() {
|
||
|
|
var x [iota]int // [2]int
|
||
|
|
var y [iota]int // [2]int
|
||
|
|
const (
|
||
|
|
Zero = iota
|
||
|
|
One
|
||
|
|
Two
|
||
|
|
_ = unsafe.Sizeof([iota - 1]int{} == x) // assert types are equal
|
||
|
|
_ = unsafe.Sizeof([iota - 2]int{} == y) // assert types are equal
|
||
|
|
_ = unsafe.Sizeof([Two]int{} == x) // assert types are equal
|
||
|
|
)
|
||
|
|
var z [iota]int // [2]int
|
||
|
|
_ = unsafe.Sizeof([2]int{} == z) // assert types are equal
|
||
|
|
})
|
||
|
|
three = iota // the sequence continues
|
||
|
|
)
|
||
|
|
|
||
|
|
var _ [three]int = [3]int{} // assert 'three' has correct value
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
|
||
|
|
const (
|
||
|
|
_ = iota
|
||
|
|
_ = len([iota]byte{})
|
||
|
|
_ = unsafe.Sizeof(iota)
|
||
|
|
_ = unsafe.Sizeof(func() { _ = iota })
|
||
|
|
_ = unsafe.Sizeof(func() { var _ = iota })
|
||
|
|
_ = unsafe.Sizeof(func() { const _ = iota })
|
||
|
|
_ = unsafe.Sizeof(func() { type _ [iota]byte })
|
||
|
|
_ = unsafe.Sizeof(func() { func() int { return iota }() })
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
zero = iota
|
||
|
|
one = iota
|
||
|
|
_ = unsafe.Sizeof(func() {
|
||
|
|
var x [iota]int // [2]int
|
||
|
|
var y [iota]int // [2]int
|
||
|
|
const (
|
||
|
|
Zero = iota
|
||
|
|
One
|
||
|
|
Two
|
||
|
|
_ = unsafe.Sizeof([iota - 1]int{} == x) // assert types are equal
|
||
|
|
_ = unsafe.Sizeof([iota - 2]int{} == y) // assert types are equal
|
||
|
|
_ = unsafe.Sizeof([Two]int{} == x) // assert types are equal
|
||
|
|
)
|
||
|
|
var z [iota]int // [2]int
|
||
|
|
_ = unsafe.Sizeof([2]int{} == z) // assert types are equal
|
||
|
|
})
|
||
|
|
three = iota // the sequence continues
|
||
|
|
)
|
||
|
|
|
||
|
|
var _ [three]int = [3]int{} // assert 'three' has correct value
|
||
|
|
}
|