Can I comment out a GTY variable?

[H. J. Lu]

I am trying to comment out

static GTY (()) int foo = 0;

with

#if 0
static GTY (()) int foo = 0;
#endif

But I got an error saying something like

./gt....h:44: error: foo undeclared here (not in a function)

Is that expected? How can I comment it out?


H.J.