[PATCH] libstdc++: fix compile error when converting std::weak_ptr<T[]>

[Giuseppe D'Angelo]

Hello,

The attached patch fixes a compile error when converting a weak_ptr of 
array type to a compatible type, for instance:

std::weak_ptr<int [42]> wptr;
std::weak_ptr<int []> wptr2 = wptr; // ERROR

https://gcc.godbolt.org/z/EWYb73Mvf

The reason seems to be a typo: the inner __weak_ptr class has a lock() 
implementation which doesn't work with arrays because it accidentally 
uses `element_type` instead of `_Tp`. That lock() (and *not* 
std::weak_ptr::lock(), which is instead fine) is called by the 
converting constructors of __weak_ptr and that causes the compile error.

I'm not sure if this has been already reported somewhere.

Tested on x86-64 Linux.

Thanks,
-- 
Giuseppe D'Angelo
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