go const5 源码
golang const5 代码
文件路径：/test/const5.go
// errorcheck
// Copyright 2011 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 that len non-constants are not constants, https://golang.org/issue/3244.
package p
var b struct {
a[10]int
}
var m map[string][20]int
var s [][30]int
func f() *[40]int
var c chan *[50]int
var z complex128
const (
n1 = len(b.a)
n2 = len(m[""])
n3 = len(s[10])
n4 = len(f()) // ERROR "is not a constant|is not constant"
n5 = len(<-c) // ERROR "is not a constant|is not constant"
n6 = cap(f()) // ERROR "is not a constant|is not constant"
n7 = cap(<-c) // ERROR "is not a constant|is not constant"
n8 = real(z) // ERROR "is not a constant|is not constant"
n9 = len([4]float64{real(z)}) // ERROR "is not a constant|is not constant"
)
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