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55c0ad4b62
Fixes #22344 Change-Id: I7c400d9d4ebcab279d08a8c190508d82cbd20899 Reviewed-on: https://go-review.googlesource.com/c/go/+/194717 Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// compile
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test iota inside a function in a ConstSpec is accepted
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package main
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import (
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"unsafe"
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)
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// iotas are usable inside closures in constant declarations (#22345)
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const (
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_ = iota
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_ = len([iota]byte{})
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_ = unsafe.Sizeof(iota)
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_ = unsafe.Sizeof(func() { _ = iota })
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_ = unsafe.Sizeof(func() { var _ = iota })
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_ = unsafe.Sizeof(func() { const _ = iota })
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_ = unsafe.Sizeof(func() { type _ [iota]byte })
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_ = unsafe.Sizeof(func() { func() int { return iota }() })
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)
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// verify inner and outer const declarations have distinct iotas
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const (
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zero = iota
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one = iota
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_ = unsafe.Sizeof(func() {
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var x [iota]int // [2]int
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var y [iota]int // [2]int
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const (
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Zero = iota
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One
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Two
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_ = unsafe.Sizeof([iota - 1]int{} == x) // assert types are equal
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_ = unsafe.Sizeof([iota - 2]int{} == y) // assert types are equal
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_ = unsafe.Sizeof([Two]int{} == x) // assert types are equal
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)
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var z [iota]int // [2]int
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_ = unsafe.Sizeof([2]int{} == z) // assert types are equal
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})
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three = iota // the sequence continues
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)
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var _ [three]int = [3]int{} // assert 'three' has correct value
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func main() {
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const (
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_ = iota
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_ = len([iota]byte{})
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_ = unsafe.Sizeof(iota)
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_ = unsafe.Sizeof(func() { _ = iota })
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_ = unsafe.Sizeof(func() { var _ = iota })
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_ = unsafe.Sizeof(func() { const _ = iota })
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_ = unsafe.Sizeof(func() { type _ [iota]byte })
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_ = unsafe.Sizeof(func() { func() int { return iota }() })
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)
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const (
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zero = iota
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one = iota
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_ = unsafe.Sizeof(func() {
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var x [iota]int // [2]int
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var y [iota]int // [2]int
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const (
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Zero = iota
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One
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Two
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_ = unsafe.Sizeof([iota - 1]int{} == x) // assert types are equal
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_ = unsafe.Sizeof([iota - 2]int{} == y) // assert types are equal
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_ = unsafe.Sizeof([Two]int{} == x) // assert types are equal
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)
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var z [iota]int // [2]int
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_ = unsafe.Sizeof([2]int{} == z) // assert types are equal
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})
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three = iota // the sequence continues
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)
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var _ [three]int = [3]int{} // assert 'three' has correct value
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}
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