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-rw-r--r--test/strcopy.go29
1 files changed, 29 insertions, 0 deletions
diff --git a/test/strcopy.go b/test/strcopy.go
new file mode 100644
index 0000000..6d32bae
--- /dev/null
+++ b/test/strcopy.go
@@ -0,0 +1,29 @@
+// run
+
+// Copyright 2018 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 string([]byte(string)) makes a copy and doesn't reduce to
+// nothing. (Issue 25834)
+
+package main
+
+import (
+ "reflect"
+ "unsafe"
+)
+
+func main() {
+ var (
+ buf = make([]byte, 2<<10)
+ large = string(buf)
+ sub = large[10:12]
+ subcopy = string([]byte(sub))
+ subh = *(*reflect.StringHeader)(unsafe.Pointer(&sub))
+ subcopyh = *(*reflect.StringHeader)(unsafe.Pointer(&subcopy))
+ )
+ if subh.Data == subcopyh.Data {
+ panic("sub and subcopy have the same underlying array")
+ }
+}