return s.newValue2(ssa.OpStringMake, n.Type(), ptr, len)
	case ir.OSTR2BYTESTMP:
		n := n.(*ir.ConvExpr)
		str := s.expr(n.X)
		ptr := s.newValue1(ssa.OpStringPtr, s.f.Config.Types.BytePtr, str)
		if !n.NonNil() {
			// We need to ensure []byte("") evaluates to []byte{}, and not []byte(nil).
			//
			// TODO(mdempsky): Investigate using "len != 0" instead of "ptr != nil".

			}
			c <- struct{}{}
		}()
		runtime.Goexit()
	}()
	// Note: if the defer fails to run, we will get a deadlock here
	<-c
}

func TestGoNil(t *testing.T) {
	output := runTestProg(t, "testprog", "GoNil")
	want := "go of nil func value"
	if !strings.Contains(output, want) {
		t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
	}
}

func TestMainGoroutineID(t *testing.T) {

		ir.OANDNOT,
		ir.OBITNOT,
		ir.OCONV,
		ir.OCONVIFACE,
		ir.OCONVNOP,
		ir.ODIV,
		ir.ODOT,
		ir.ODOTTYPE,
		ir.OLITERAL,
		ir.OLSH,
		ir.OMOD,
		ir.OMUL,
		ir.ONEG,
		ir.ONIL,
		ir.OOR,
		ir.OOROR,
		ir.OPAREN,
		ir.OPLUS,
		ir.ORSH,
		ir.OSUB,
		ir.OXOR:
		return false
	}

	// Be conservative.
	return true
}

// expand append(l1, l2...) to

	// These implement IsNil.
	// Wrap in extra struct to hide interface type.
	doNil := []any{
		struct{ x *int }{},
		struct{ x any }{},
		struct{ x map[string]int }{},
		struct{ x func() bool }{},
		struct{ x chan int }{},
		struct{ x []string }{},
		struct{ x unsafe.Pointer }{},
	}
	for _, ts := range doNil {
		ty := TypeOf(ts).Field(0).Type
		v := Zero(ty)