[Bug libstdc++/81964] istream_iterator: unexpected read in ctor

[abominable-snowman at yandex dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81964

Petr Ovtchenkov <abominable-snowman at yandex dot ru> changed:

           What    |Removed                     |Added
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  Attachment #42035|0                           |1
        is obsolete|                            |

--- Comment #4 from Petr Ovtchenkov <abominable-snowman at yandex dot ru> ---
Created attachment 42058
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42058&action=edit
proposed test for issue