// Call the debug function.
		h.debugCallRun(ctxt)
	case 1:
		// Function returned. Copy frame and result registers back out.
		h.debugCallReturn(ctxt)
	case 2:
		// Function panicked. Copy panic out.
		h.debugCallPanicOut(ctxt)
	case 8:
		// Call isn't safe. Get the reason.
		h.debugCallUnsafe(ctxt)
		// Don't wake h.done. We need to transition to status 16 first.
	case 16:

	if v != uint64(orig.Cur) {
		t.Errorf("exec rlimit = %d, want %d", v, orig)
	}
}

func TestForkExecNilArgv(t *testing.T) {
	defer func() {
		if p := recover(); p != nil {
			t.Fatal("forkExec panicked")
		}
	}()

	// We don't really care what the result of forkExec is, just that it doesn't
	// panic, so we choose something we know won't actually spawn a process (probably).

	}
	for _, tt := range tests {
		didPanic := make(chan bool)
		go func() {
			defer func() { didPanic <- recover() != nil }()
			tt.fn()
		}()
		if got := <-didPanic; got != tt.wantPanic {
			t.Errorf("%s: panicked = %v; want %v", tt.name, got, tt.wantPanic)
		}
	}
}

func TestBuilderWriteInvalidRune(t *testing.T) {
	// Invalid runes, including negative ones, should be written as
	// utf8.RuneError.