1 files changed, 130 insertions, 0 deletions
diff --git a/test/bigalg.go b/test/bigalg.go
new file mode 100644
index 0000000..60e8229
--- /dev/null
+++ b/test/bigalg.go
@@ -0,0 +1,130 @@
+// 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 the internal "algorithms" for objects larger than a word: hashing, equality etc.
+
+package main
+
+type T struct {
+	a float64
+	b int64
+	c string
+	d byte
+}
+
+var a = []int{1, 2, 3}
+var NIL []int
+
+func arraycmptest() {
+	if NIL != nil {
+		println("fail1:", NIL, "!= nil")
+		panic("bigalg")
+	}
+	if nil != NIL {
+		println("fail2: nil !=", NIL)
+		panic("bigalg")
+	}
+	if a == nil || nil == a {
+		println("fail3:", a, "== nil")
+		panic("bigalg")
+	}
+}
+
+func SameArray(a, b []int) bool {
+	if len(a) != len(b) || cap(a) != cap(b) {
+		return false
+	}
+	if len(a) > 0 && &a[0] != &b[0] {
+		return false
+	}
+	return true
+}
+
+var t = T{1.5, 123, "hello", 255}
+var mt = make(map[int]T)
+var ma = make(map[int][]int)
+
+func maptest() {
+	mt[0] = t
+	t1 := mt[0]
+	if t1.a != t.a || t1.b != t.b || t1.c != t.c || t1.d != t.d {
+		println("fail: map val struct", t1.a, t1.b, t1.c, t1.d)
+		panic("bigalg")
+	}
+
+	ma[1] = a
+	a1 := ma[1]
+	if !SameArray(a, a1) {
+		println("fail: map val array", a, a1)
+		panic("bigalg")
+	}
+}
+
+var ct = make(chan T)
+var ca = make(chan []int)
+
+func send() {
+	ct <- t
+	ca <- a
+}
+
+func chantest() {
+	go send()
+
+	t1 := <-ct
+	if t1.a != t.a || t1.b != t.b || t1.c != t.c || t1.d != t.d {
+		println("fail: map val struct", t1.a, t1.b, t1.c, t1.d)
+		panic("bigalg")
+	}
+
+	a1 := <-ca
+	if !SameArray(a, a1) {
+		println("fail: map val array", a, a1)
+		panic("bigalg")
+	}
+}
+
+type E struct{}
+
+var e E
+
+func interfacetest() {
+	var i interface{}
+
+	i = a
+	a1 := i.([]int)
+	if !SameArray(a, a1) {
+		println("interface <-> []int", a, a1)
+		panic("bigalg")
+	}
+	pa := new([]int)
+	*pa = a
+	i = pa
+	a1 = *i.(*[]int)
+	if !SameArray(a, a1) {
+		println("interface <-> *[]int", a, a1)
+		panic("bigalg")
+	}
+
+	i = t
+	t1 := i.(T)
+	if t1.a != t.a || t1.b != t.b || t1.c != t.c || t1.d != t.d {
+		println("interface <-> struct", t1.a, t1.b, t1.c, t1.d)
+		panic("bigalg")
+	}
+
+	i = e
+	e1 := i.(E)
+	// nothing to check; just verify it doesn't crash
+	_ = e1
+}
+
+func main() {
+	arraycmptest()
+	maptest()
+	chantest()
+	interfacetest()
+}