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-rw-r--r--test/indirect.go87
1 files changed, 87 insertions, 0 deletions
diff --git a/test/indirect.go b/test/indirect.go
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+// run
+
+// Copyright 2009 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 various safe uses of indirection.
+
+package main
+
+var m0 map[string]int
+var m1 *map[string]int
+var m2 *map[string]int = &m0
+var m3 map[string]int = map[string]int{"a": 1}
+var m4 *map[string]int = &m3
+
+var s0 string
+var s1 *string
+var s2 *string = &s0
+var s3 string = "a"
+var s4 *string = &s3
+
+var a0 [10]int
+var a1 *[10]int
+var a2 *[10]int = &a0
+
+var b0 []int
+var b1 *[]int
+var b2 *[]int = &b0
+var b3 []int = []int{1, 2, 3}
+var b4 *[]int = &b3
+
+func crash() {
+ // these uses of nil pointers
+ // would crash but should type check
+ println("crash",
+ len(a1)+cap(a1))
+}
+
+func nocrash() {
+ // this is spaced funny so that
+ // the compiler will print a different
+ // line number for each len call if
+ // it decides there are type errors.
+ // it might also help in the traceback.
+ x :=
+ len(m0) +
+ len(m3)
+ if x != 1 {
+ println("wrong maplen")
+ panic("fail")
+ }
+
+ x =
+ len(s0) +
+ len(s3)
+ if x != 1 {
+ println("wrong stringlen")
+ panic("fail")
+ }
+
+ x =
+ len(a0) +
+ len(a2)
+ if x != 20 {
+ println("wrong arraylen")
+ panic("fail")
+ }
+
+ x =
+ len(b0) +
+ len(b3)
+ if x != 3 {
+ println("wrong slicelen")
+ panic("fail")
+ }
+
+ x =
+ cap(b0) +
+ cap(b3)
+ if x != 3 {
+ println("wrong slicecap")
+ panic("fail")
+ }
+}
+
+func main() { nocrash() }