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Source file test/live.go

Documentation: test

  // errorcheckwithauto -0 -l -live -wb=0 -d=ssa/insert_resched_checks/off
  // +build !ppc64,!ppc64le
  // ppc64 needs a better tighten pass to make f18 pass
  // rescheduling checks need to be turned off because there are some live variables across the inserted check call
  
  // 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) {
  	// Here x and y are ambiguously live. In previous go versions they
  	// were marked as live throughout the function to avoid being
  	// poisoned in GODEBUG=gcdead=1 mode; this is now no longer the
  	// case.
  
  	printint(0)
  	if b1 == false {
  		printint(0)
  		return
  	}
  
  	if b2 {
  		var x *int
  		printpointer(&x) // ERROR "live at call to printpointer: x$"
  		printpointer(&x) // ERROR "live at call to printpointer: x$"
  	} else {
  		var y *int
  		printpointer(&y) // ERROR "live at call to printpointer: y$"
  		printpointer(&y) // ERROR "live at call to printpointer: y$"
  	}
  	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
  	y := interface{}(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+ x.data x.type$" "live at call to str: x.data x.type$"
  	i9 = y                  // make y escape so the line above has to call convT2E
  	return x != y
  }
  
  // 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
  var mi map[interface{}]int
  
  // str and iface are used to ensure that a temp is required for runtime calls below.
  func str() string
  func iface() interface{}
  
  func f16() {
  	if b {
  		delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$"
  	}
  	delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$"
  	delete(mi, iface()) // 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(p *byte) { // ERROR "live at entry to f17a: p$"
  	if b {
  		m2[x2] = p // ERROR "live at call to mapassign: p$"
  	}
  	m2[x2] = p // ERROR "live at call to mapassign: p$"
  	m2[x2] = p // ERROR "live at call to mapassign: p$"
  }
  
  func f17b(p *byte) { // ERROR "live at entry to f17b: p$"
  	// key temporary
  	if b {
  		m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
  	}
  	m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
  	m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
  }
  
  func f17c() {
  	// key and value temporaries
  	if b {
  		m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$"
  	}
  	m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$"
  	m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$"
  }
  
  func f17d() *byte
  
  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
  
  // byteptr is used to ensure that a temp is required for runtime calls below.
  func byteptr() *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 <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$"
  	}
  	ch <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$"
  	ch <- byteptr() // 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 mapassign: .autotmp_[0-9]+$"
  	}
  	m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$"
  	m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .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(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+$" "live at call to g31: .autotmp_[0-9]+$"
  	}
  	if b2 {
  		h31(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+ .autotmp_[0-9]+$" "live at call to h31: .autotmp_[0-9]+$" "live at call to newobject: .autotmp_[0-9]+$"
  	}
  	if b3 {
  		panic(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+$" "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[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
  		printnl()
  		return
  	} else {
  		printnl()
  	}
  	printnl()
  }
  
  func f34() {
  	if m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
  		printnl()
  		return
  	}
  	printnl()
  }
  
  func f35() {
  	if m33[byteptr()] == 0 && m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
  		printnl()
  		return
  	}
  	printnl()
  }
  
  func f36() {
  	if m33[byteptr()] == 0 || m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
  		printnl()
  		return
  	}
  	printnl()
  }
  
  func f37() {
  	if (m33[byteptr()] == 0 || m33[byteptr()] == 0) && m33[byteptr()] == 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]+)+$" "live at call to selectgo:( .autotmp_[0-9]+)+$"
  		case <-fc38(): // ERROR "live at call to selectrecv:( .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]+)+$" "live at call to selectsend:( .autotmp_[0-9]+)+$"
  			printnl()
  		case *fi38(2) = <-fc38(): // ERROR "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" "live at call to selectrecv:( .autotmp_[0-9]+)+$"
  			printnl()
  		case *fi38(3), *fb38() = <-fc38(): // ERROR "live at call to fb38:( .autotmp_[0-9]+)+$" "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" "live at call to selectrecv:( .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$"
  	ddd2(x, y) // ERROR "live at call to ddd2: .autotmp_[0-9]+$"
  	printnl()
  	// Note: no .?autotmp live at printnl.  See issue 16996.
  }
  func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$"
  	sink = a[0]
  }
  
  // issue 16016: autogenerated wrapper should have arguments live
  type T struct{}
  
  func (*T) Foo(ptr *int) {}
  
  type R struct{ *T } // ERRORAUTO "live at entry to \(\*R\)\.Foo: \.this ptr" "live at entry to R\.Foo: \.this ptr"
  
  // issue 18860: output arguments must be live all the time if there is a defer.
  // In particular, at printint r must be live.
  func f41(p, q *int) (r *int) { // ERROR "live at entry to f41: p q$"
  	r = p
  	defer func() { // ERROR "live at call to deferproc: q r$" "live at call to deferreturn: r$"
  		recover()
  	}()
  	printint(0) // ERROR "live at call to printint: q r$"
  	r = q
  	return // ERROR "live at call to deferreturn: r$"
  }
  

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