Initial commit: Go 1.23 release state

test/convert4.go

@@ -0,0 +1,108 @@
+// run
+
+// Copyright 2020 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 conversion from slice to array pointer.
+
+package main
+
+func wantPanic(fn func(), s string) {
+	defer func() {
+		err := recover()
+		if err == nil {
+			panic("expected panic")
+		}
+		if got := err.(error).Error(); got != s {
+			panic("expected panic " + s + " got " + got)
+		}
+	}()
+	fn()
+}
+
+func main() {
+	s := make([]byte, 8, 10)
+	for i := range s {
+		s[i] = byte(i)
+	}
+	if p := (*[8]byte)(s); &p[0] != &s[0] {
+		panic("*[8]byte conversion failed")
+	}
+	if [8]byte(s) != *(*[8]byte)(s) {
+		panic("[8]byte conversion failed")
+	}
+	wantPanic(
+		func() {
+			_ = (*[9]byte)(s)
+		},
+		"runtime error: cannot convert slice with length 8 to array or pointer to array with length 9",
+	)
+	wantPanic(
+		func() {
+			_ = [9]byte(s)
+		},
+		"runtime error: cannot convert slice with length 8 to array or pointer to array with length 9",
+	)
+
+	var n []byte
+	if p := (*[0]byte)(n); p != nil {
+		panic("nil slice converted to *[0]byte should be nil")
+	}
+	_ = [0]byte(n)
+
+	z := make([]byte, 0)
+	if p := (*[0]byte)(z); p == nil {
+		panic("empty slice converted to *[0]byte should be non-nil")
+	}
+	_ = [0]byte(z)
+
+	var p *[]byte
+	wantPanic(
+		func() {
+			_ = [0]byte(*p) // evaluating *p should still panic
+		},
+		"runtime error: invalid memory address or nil pointer dereference",
+	)
+
+	// Test with named types
+	type Slice []int
+	type Int4 [4]int
+	type PInt4 *[4]int
+	ii := make(Slice, 4)
+	if p := (*Int4)(ii); &p[0] != &ii[0] {
+		panic("*Int4 conversion failed")
+	}
+	if p := PInt4(ii); &p[0] != &ii[0] {
+		panic("PInt4 conversion failed")
+	}
+}
+
+// test static variable conversion
+
+var (
+	ss  = make([]string, 10)
+	s5  = (*[5]string)(ss)
+	s10 = (*[10]string)(ss)
+
+	ns  []string
+	ns0 = (*[0]string)(ns)
+
+	zs  = make([]string, 0)
+	zs0 = (*[0]string)(zs)
+)
+
+func init() {
+	if &ss[0] != &s5[0] {
+		panic("s5 conversion failed")
+	}
+	if &ss[0] != &s10[0] {
+		panic("s5 conversion failed")
+	}
+	if ns0 != nil {
+		panic("ns0 should be nil")
+	}
+	if zs0 == nil {
+		panic("zs0 should not be nil")
+	}
+}