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// 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 }
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