すぐ忘れるので書いておこう。

(gdb) p commands\[0\]
Could not find operator\[\].
(gdb) p commands.operator\[\](0)
Cannot evaluate function -- may be inlined

((( ;ﾟ дﾟ))) アワワワ

(gdb) p commands.\_M\_impl.\_M\_start\[0\]
$3 = {px = 0x7fba6bd1a0b0, pn = {pi\_ = 0x7fba6b91f880}}

（・∀・ ）ニヤニヤ