我想问一问，为什么结构体a的指针变量的地址不能被GDB打印出来？？
(gdb) p &next
Can't take address of "next" which isn't an lvalue.
(gdb) p *next
value has been optimized out
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(gdb) p &next
Can't take address of "next" which isn't an lvalue.
(gdb) p *next
value has been optimized out
2016-10-04
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