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go/test/const5.go
Russ Cox d4fb568e04 cmd/gc: implement len(array) / cap(array) rule
The spec is looser than the current implementation.
The spec edit was made in CL 4444050 (May 2011)
but I never implemented it.

Fixes #3244.

R=ken2
CC=golang-dev
https://golang.org/cl/5785049
2012-03-07 22:43:28 -05:00

34 lines
613 B
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, http://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
const (
n1 = len(b.a)
n2 = len(m[""])
n3 = len(s[10])
n4 = len(f()) // ERROR "must be constant"
n5 = len(<-c) // ERROR "must be constant"
n6 = cap(f()) // ERROR "must be constant"
n7 = cap(<-c) // ERROR "must be constant"
)