test,cmd/compile: remove _ssa file suffix

Everything is SSA now.

Update #16357

Change-Id: I436dbe367b863ee81a3695a7d653ba4bfc5b0f6c
Reviewed-on: https://go-review.googlesource.com/29232
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 656 insertions, 0 deletions

diff --git a/test/live.go b/test/live.go
new file mode 100644
index 0000000000..373b4e9c2f
--- /dev/null
+++ b/test/live.go
@@ -0,0 +1,656 @@
+// errorcheck -0 -l -live -wb=0
+
+// Copyright 2014 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.
+
+// liveness tests with inlining disabled.
+// see also live2.go.
+
+package main
+
+func printnl()
+
+//go:noescape
+func printpointer(**int)
+
+//go:noescape
+func printintpointer(*int)
+
+//go:noescape
+func printstringpointer(*string)
+
+//go:noescape
+func printstring(string)
+
+//go:noescape
+func printbytepointer(*byte)
+
+func printint(int)
+
+func f1() {
+	var x *int
+	printpointer(&x) // ERROR "live at call to printpointer: x$"
+	printpointer(&x) // ERROR "live at call to printpointer: x$"
+}
+
+func f2(b bool) {
+	if b {
+		printint(0) // nothing live here
+		return
+	}
+	var x *int
+	printpointer(&x) // ERROR "live at call to printpointer: x$"
+	printpointer(&x) // ERROR "live at call to printpointer: x$"
+}
+
+func f3(b1, b2 bool) {
+	// Because x and y are ambiguously live, they appear
+	// live throughout the function, to avoid being poisoned
+	// in GODEBUG=gcdead=1 mode.
+
+	printint(0) // ERROR "live at call to printint: x y$"
+	if b1 == false {
+		printint(0) // ERROR "live at call to printint: x y$"
+		return
+	}
+
+	if b2 {
+		var x *int
+		printpointer(&x) // ERROR "live at call to printpointer: x y$"
+		printpointer(&x) // ERROR "live at call to printpointer: x y$"
+	} else {
+		var y *int
+		printpointer(&y) // ERROR "live at call to printpointer: x y$"
+		printpointer(&y) // ERROR "live at call to printpointer: x y$"
+	}
+	printint(0) // ERROR "f3: x \(type \*int\) is ambiguously live$" "f3: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$"
+}
+
+// The old algorithm treated x as live on all code that
+// could flow to a return statement, so it included the
+// function entry and code above the declaration of x
+// but would not include an indirect use of x in an infinite loop.
+// Check that these cases are handled correctly.
+
+func f4(b1, b2 bool) { // x not live here
+	if b2 {
+		printint(0) // x not live here
+		return
+	}
+	var z **int
+	x := new(int)
+	*x = 42
+	z = &x
+	printint(**z) // ERROR "live at call to printint: x$"
+	if b2 {
+		printint(1) // x not live here
+		return
+	}
+	for {
+		printint(**z) // ERROR "live at call to printint: x$"
+	}
+}
+
+func f5(b1 bool) {
+	var z **int
+	if b1 {
+		x := new(int)
+		*x = 42
+		z = &x
+	} else {
+		y := new(int)
+		*y = 54
+		z = &y
+	}
+	printint(**z) // ERROR "f5: x \(type \*int\) is ambiguously live$" "f5: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$"
+}
+
+// confusion about the _ result used to cause spurious "live at entry to f6: _".
+
+func f6() (_, y string) {
+	y = "hello"
+	return
+}
+
+// confusion about addressed results used to cause "live at entry to f7: x".
+
+func f7() (x string) {
+	_ = &x
+	x = "hello"
+	return
+}
+
+// ignoring block returns used to cause "live at entry to f8: x, y".
+
+func f8() (x, y string) {
+	return g8()
+}
+
+func g8() (string, string)
+
+// ignoring block assignments used to cause "live at entry to f9: x"
+// issue 7205
+
+var i9 interface{}
+
+func f9() bool {
+	g8()
+	x := i9
+	return x != interface{}(99.0i) // ERROR "live at call to convT2E: x.data x.type$"
+}
+
+// liveness formerly confused by UNDEF followed by RET,
+// leading to "live at entry to f10: ~r1" (unnamed result).
+
+func f10() string {
+	panic(1)
+}
+
+// liveness formerly confused by select, thinking runtime.selectgo
+// can return to next instruction; it always jumps elsewhere.
+// note that you have to use at least two cases in the select
+// to get a true select; smaller selects compile to optimized helper functions.
+
+var c chan *int
+var b bool
+
+// this used to have a spurious "live at entry to f11a: ~r0"
+func f11a() *int {
+	select { // ERROR "live at call to newselect: autotmp_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+$"
+	case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
+		return nil
+	case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
+		return nil
+	}
+}
+
+func f11b() *int {
+	p := new(int)
+	if b {
+		// At this point p is dead: the code here cannot
+		// get to the bottom of the function.
+		// This used to have a spurious "live at call to printint: p".
+		printint(1) // nothing live here!
+		select {    // ERROR "live at call to newselect: autotmp_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+$"
+		case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
+			return nil
+		case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
+			return nil
+		}
+	}
+	println(*p)
+	return nil
+}
+
+var sink *int
+
+func f11c() *int {
+	p := new(int)
+	sink = p // prevent stack allocation, otherwise p is rematerializeable
+	if b {
+		// Unlike previous, the cases in this select fall through,
+		// so we can get to the println, so p is not dead.
+		printint(1) // ERROR "live at call to printint: p$"
+		select {    // ERROR "live at call to newselect: autotmp_[0-9]+ p$" "live at call to selectgo: autotmp_[0-9]+ p$"
+		case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+ p$"
+		case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+ p$"
+		}
+	}
+	println(*p)
+	return nil
+}
+
+// similarly, select{} does not fall through.
+// this used to have a spurious "live at entry to f12: ~r0".
+
+func f12() *int {
+	if b {
+		select {}
+	} else {
+		return nil
+	}
+}
+
+// incorrectly placed VARDEF annotations can cause missing liveness annotations.
+// this used to be missing the fact that s is live during the call to g13 (because it is
+// needed for the call to h13).
+
+func f13() {
+	s := g14()
+	s = h13(s, g13(s)) // ERROR "live at call to g13: s.ptr$"
+}
+
+func g13(string) string
+func h13(string, string) string
+
+// more incorrectly placed VARDEF.
+
+func f14() {
+	x := g14()
+	printstringpointer(&x) // ERROR "live at call to printstringpointer: x$"
+}
+
+func g14() string
+
+func f15() {
+	var x string
+	_ = &x
+	x = g15()      // ERROR "live at call to g15: x$"
+	printstring(x) // ERROR "live at call to printstring: x$"
+}
+
+func g15() string
+
+// Checking that various temporaries do not persist or cause
+// ambiguously live values that must be zeroed.
+// The exact temporary names are inconsequential but we are
+// trying to check that there is only one at any given site,
+// and also that none show up in "ambiguously live" messages.
+
+var m map[string]int
+
+func f16() {
+	if b {
+		delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
+	}
+	delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
+	delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
+}
+
+var m2s map[string]*byte
+var m2 map[[2]string]*byte
+var x2 [2]string
+var bp *byte
+
+func f17a() {
+	// value temporary only
+	if b {
+		m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
+	}
+	m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
+	m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
+}
+
+func f17b() {
+	// key temporary only
+	if b {
+		m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
+	}
+	m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
+	m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
+}
+
+func f17c() {
+	// key and value temporaries
+	if b {
+		m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
+	}
+	m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
+	m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
+}
+
+func g18() [2]string
+
+func f18() {
+	// key temporary for mapaccess.
+	// temporary introduced by orderexpr.
+	var z *byte
+	if b {
+		z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+	}
+	z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+	z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+	printbytepointer(z)
+}
+
+var ch chan *byte
+
+func f19() {
+	// dest temporary for channel receive.
+	var z *byte
+
+	if b {
+		z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
+	}
+	z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
+	z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
+	printbytepointer(z)
+}
+
+func f20() {
+	// src temporary for channel send
+	if b {
+		ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
+	}
+	ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
+	ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
+}
+
+func f21() {
+	// key temporary for mapaccess using array literal key.
+	var z *byte
+	if b {
+		z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+	}
+	z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+	z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+	printbytepointer(z)
+}
+
+func f23() {
+	// key temporary for two-result map access using array literal key.
+	var z *byte
+	var ok bool
+	if b {
+		z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
+	}
+	z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
+	z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
+	printbytepointer(z)
+	print(ok)
+}
+
+func f24() {
+	// key temporary for map access using array literal key.
+	// value temporary too.
+	if b {
+		m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
+	}
+	m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
+	m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
+}
+
+// defer should not cause spurious ambiguously live variables
+
+func f25(b bool) {
+	defer g25()
+	if b {
+		return
+	}
+	var x string
+	_ = &x
+	x = g15()      // ERROR "live at call to g15: x$"
+	printstring(x) // ERROR "live at call to printstring: x$"
+} // ERROR "live at call to deferreturn: x$"
+
+func g25()
+
+// non-escaping ... slices passed to function call should die on return,
+// so that the temporaries do not stack and do not cause ambiguously
+// live variables.
+
+func f26(b bool) {
+	if b {
+		print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
+	}
+	print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
+	print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
+	printnl()
+}
+
+//go:noescape
+func print26(...interface{})
+
+// non-escaping closures passed to function call should die on return
+
+func f27(b bool) {
+	x := 0
+	if b {
+		call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
+	}
+	call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
+	call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
+	printnl()
+}
+
+// but defer does escape to later execution in the function
+
+func f27defer(b bool) {
+	x := 0
+	if b {
+		defer call27(func() { x++ }) // ERROR "live at call to deferproc: autotmp_[0-9]+$" "live at call to deferreturn: autotmp_[0-9]+$"
+	}
+	defer call27(func() { x++ }) // ERROR "f27defer: autotmp_[0-9]+ \(type struct { F uintptr; x \*int }\) is ambiguously live$" "live at call to deferproc: autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to deferreturn: autotmp_[0-9]+ autotmp_[0-9]+$"
+	printnl()                    // ERROR "live at call to printnl: autotmp_[0-9]+ autotmp_[0-9]+$"
+} // ERROR "live at call to deferreturn: autotmp_[0-9]+ autotmp_[0-9]+$"
+
+// and newproc (go) escapes to the heap
+
+func f27go(b bool) {
+	x := 0
+	if b {
+		go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" "live at call to newproc: &x$"
+	}
+	go call27(func() { x++ }) // ERROR "live at call to newobject: &x$"
+	printnl()
+}
+
+//go:noescape
+func call27(func())
+
+// concatstring slice should die on return
+
+var s1, s2, s3, s4, s5, s6, s7, s8, s9, s10 string
+
+func f28(b bool) {
+	if b {
+		printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
+	}
+	printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
+	printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
+}
+
+// map iterator should die on end of range loop
+
+func f29(b bool) {
+	if b {
+		for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
+			printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
+		}
+	}
+	for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
+		printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
+	}
+	for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
+		printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
+	}
+}
+
+// copy of array of pointers should die at end of range loop
+
+var ptrarr [10]*int
+
+func f30(b bool) {
+	// two live temps during print(p):
+	// the copy of ptrarr and the internal iterator pointer.
+	if b {
+		for _, p := range ptrarr {
+			printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
+		}
+	}
+	for _, p := range ptrarr {
+		printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
+	}
+	for _, p := range ptrarr {
+		printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
+	}
+}
+
+// conversion to interface should not leave temporary behind
+
+func f31(b1, b2, b3 bool) {
+	if b1 {
+		g31("a") // ERROR "live at call to convT2E: autotmp_[0-9]+$" "live at call to g31: autotmp_[0-9]+$"
+	}
+	if b2 {
+		h31("b") // ERROR "live at call to convT2E: autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to h31: autotmp_[0-9]+$" "live at call to newobject: autotmp_[0-9]+$"
+	}
+	if b3 {
+		panic("asdf") // ERROR "live at call to convT2E: autotmp_[0-9]+$" "live at call to gopanic: autotmp_[0-9]+$"
+	}
+	print(b3)
+}
+
+func g31(interface{})
+func h31(...interface{})
+
+// non-escaping partial functions passed to function call should die on return
+
+type T32 int
+
+func (t *T32) Inc() { // ERROR "live at entry to \(\*T32\).Inc: t$"
+	*t++
+}
+
+var t32 T32
+
+func f32(b bool) {
+	if b {
+		call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
+	}
+	call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
+	call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
+}
+
+//go:noescape
+func call32(func())
+
+// temporaries introduced during if conditions and && || expressions
+// should die once the condition has been acted upon.
+
+var m33 map[interface{}]int
+
+func f33() {
+	if m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+		printnl()
+		return
+	} else {
+		printnl()
+	}
+	printnl()
+}
+
+func f34() {
+	if m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+		printnl()
+		return
+	}
+	printnl()
+}
+
+func f35() {
+	if m33[nil] == 0 && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+		printnl()
+		return
+	}
+	printnl()
+}
+
+func f36() {
+	if m33[nil] == 0 || m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+		printnl()
+		return
+	}
+	printnl()
+}
+
+func f37() {
+	if (m33[nil] == 0 || m33[nil] == 0) && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
+		printnl()
+		return
+	}
+	printnl()
+}
+
+// select temps should disappear in the case bodies
+
+var c38 chan string
+
+func fc38() chan string
+func fi38(int) *string
+func fb38() *bool
+
+func f38(b bool) {
+	// we don't care what temps are printed on the lines with output.
+	// we care that the println lines have no live variables
+	// and therefore no output.
+	if b {
+		select { // ERROR "live at call to newselect: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
+		case <-fc38(): // ERROR "live at call to selectrecv: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
+			printnl()
+		case fc38() <- *fi38(1): // ERROR "live at call to fc38: autotmp_[0-9]+$" "live at call to fi38: autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectsend: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
+			printnl()
+		case *fi38(2) = <-fc38(): // ERROR "live at call to fc38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to fi38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectrecv: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
+			printnl()
+		case *fi38(3), *fb38() = <-fc38(): // ERROR "live at call to fb38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to fc38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to fi38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectrecv2: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
+			printnl()
+		}
+		printnl()
+	}
+	printnl()
+}
+
+// issue 8097: mishandling of x = x during return.
+
+func f39() (x []int) {
+	x = []int{1}
+	printnl() // ERROR "live at call to printnl: autotmp_[0-9]+$"
+	return x
+}
+
+func f39a() (x []int) {
+	x = []int{1}
+	printnl() // ERROR "live at call to printnl: autotmp_[0-9]+$"
+	return
+}
+
+func f39b() (x [10]*int) {
+	x = [10]*int{}
+	x[0] = new(int) // ERROR "live at call to newobject: x$"
+	printnl()       // ERROR "live at call to printnl: x$"
+	return x
+}
+
+func f39c() (x [10]*int) {
+	x = [10]*int{}
+	x[0] = new(int) // ERROR "live at call to newobject: x$"
+	printnl()       // ERROR "live at call to printnl: x$"
+	return
+}
+
+// issue 8142: lost 'addrtaken' bit on inlined variables.
+// no inlining in this test, so just checking that non-inlined works.
+
+type T40 struct {
+	m map[int]int
+}
+
+func newT40() *T40 {
+	ret := T40{}
+	ret.m = make(map[int]int) // ERROR "live at call to makemap: &ret$"
+	return &ret
+}
+
+func bad40() {
+	t := newT40()
+	_ = t
+	printnl()
+}
+
+func good40() {
+	ret := T40{}
+	ret.m = make(map[int]int) // ERROR "live at call to makemap: autotmp_[0-9]+ ret$"
+	t := &ret
+	printnl() // ERROR "live at call to printnl: autotmp_[0-9]+ ret$"
+	_ = t
+}
+
+func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$"
+	ddd2(x, y) // ERROR "live at call to ddd2: x y autotmp_[0-9]+$"
+	printnl()  // ERROR "live at call to printnl: x y$"
+	// Note: no autotmp live at printnl.  See issue 16996.
+}
+func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$"
+	sink = a[0]
+}