Initial commit: Go 1.23 release state

test/indirect.go

@@ -0,0 +1,87 @@
+// 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() }