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author | Russ Cox <rsc@golang.org> | 2012-03-07 22:43:28 -0500 |
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committer | Russ Cox <rsc@golang.org> | 2012-03-07 22:43:28 -0500 |
commit | d4fb568e047a23a5ade5c3750da0de9fb54ff33a (patch) | |
tree | 45787ad26bf87f51c13b727d8c13278f2c9f43d7 /test/const5.go | |
parent | 43d71e7d7d1ace38e6518335ff39b7848700b9ca (diff) | |
download | go-d4fb568e047a23a5ade5c3750da0de9fb54ff33a.tar.gz go-d4fb568e047a23a5ade5c3750da0de9fb54ff33a.zip |
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
Diffstat (limited to 'test/const5.go')
-rw-r--r-- | test/const5.go | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/test/const5.go b/test/const5.go new file mode 100644 index 0000000000..8e0385e9a5 --- /dev/null +++ b/test/const5.go @@ -0,0 +1,33 @@ +// 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" +) + |