1 files changed, 140 insertions, 0 deletions
diff --git a/test/fixedbugs/issue16870.go b/test/fixedbugs/issue16870.go
new file mode 100644
index 0000000..2309997
--- /dev/null
+++ b/test/fixedbugs/issue16870.go
@@ -0,0 +1,140 @@
+// run
+
+// Copyright 2016 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 main
+
+import (
+	"log"
+	"reflect"
+)
+
+func test(got, want interface{}) {
+	if !reflect.DeepEqual(got, want) {
+		log.Fatalf("got %v, want %v", got, want)
+	}
+}
+
+func main() {
+	var i int
+	var ip *int
+	var ok interface{}
+
+	// Channel receives.
+	c := make(chan int, 1)
+	c2 := make(chan int)
+
+	c <- 42
+	i, ok = <-c
+	test(i, 42)
+	test(ok, true)
+
+	c <- 42
+	_, ok = <-c
+	test(ok, true)
+
+	c <- 42
+	select {
+	case i, ok = <-c:
+		test(i, 42)
+		test(ok, true)
+	}
+
+	c <- 42
+	select {
+	case _, ok = <-c:
+		test(ok, true)
+	}
+
+	c <- 42
+	select {
+	case i, ok = <-c:
+		test(i, 42)
+		test(ok, true)
+	default:
+		log.Fatal("bad select")
+	}
+
+	c <- 42
+	select {
+	case _, ok = <-c:
+		test(ok, true)
+	default:
+		log.Fatal("bad select")
+	}
+
+	c <- 42
+	select {
+	case i, ok = <-c:
+		test(i, 42)
+		test(ok, true)
+	case <-c2:
+		log.Fatal("bad select")
+	}
+
+	c <- 42
+	select {
+	case _, ok = <-c:
+		test(ok, true)
+	case <-c2:
+		log.Fatal("bad select")
+	}
+
+	close(c)
+	i, ok = <-c
+	test(i, 0)
+	test(ok, false)
+
+	_, ok = <-c
+	test(ok, false)
+
+	// Map indexing.
+	m := make(map[int]int)
+
+	i, ok = m[0]
+	test(i, 0)
+	test(ok, false)
+
+	_, ok = m[0]
+	test(ok, false)
+
+	m[0] = 42
+	i, ok = m[0]
+	test(i, 42)
+	test(ok, true)
+
+	_, ok = m[0]
+	test(ok, true)
+
+	// Type assertions.
+	var u interface{}
+
+	i, ok = u.(int)
+	test(i, 0)
+	test(ok, false)
+
+	ip, ok = u.(*int)
+	test(ip, (*int)(nil))
+	test(ok, false)
+
+	_, ok = u.(int)
+	test(ok, false)
+
+	u = 42
+	i, ok = u.(int)
+	test(i, 42)
+	test(ok, true)
+
+	_, ok = u.(int)
+	test(ok, true)
+
+	u = &i
+	ip, ok = u.(*int)
+	test(ip, &i)
+	test(ok, true)
+
+	_, ok = u.(*int)
+	test(ok, true)
+}