[Bug libstdc++/79820] std::ifstream sets errno to zero

[i.nixman at autistici dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79820

--- Comment #4 from niXman <i.nixman at autistici dot org> ---
(In reply to Jonathan Wakely from comment #3)

> and it also needs to be done on line 275.

why?
line 275:
https://gcc.gnu.org/viewcvs/gcc/trunk/libstdc%2B%2B-v3/config/io/basic_file_stdio.cc?view=markup#l275