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-rw-r--r--test/fixedbugs/issue19743.go31
1 files changed, 31 insertions, 0 deletions
diff --git a/test/fixedbugs/issue19743.go b/test/fixedbugs/issue19743.go
new file mode 100644
index 0000000..5089cc6
--- /dev/null
+++ b/test/fixedbugs/issue19743.go
@@ -0,0 +1,31 @@
+// errorcheck -0 -m -l
+
+// Copyright 2017 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.
+
+package foo
+
+// Escape analysis needs to treat the uintptr-typed reflect.*Header fields as pointers.
+
+import (
+ "reflect"
+ "unsafe"
+)
+
+type immutableBytes []byte
+
+// Bug was failure to leak param b.
+func toString(b immutableBytes) string { // ERROR "leaking param: b$"
+ var s string
+ if len(b) == 0 {
+ return s
+ }
+
+ strHeader := (*reflect.StringHeader)(unsafe.Pointer(&s))
+ strHeader.Data = (*reflect.SliceHeader)(unsafe.Pointer(&b)).Data
+
+ l := len(b)
+ strHeader.Len = l
+ return s
+}