[bug #27770] grep does not print warning when recursively grepping stdin

[Paolo Bonzini]

Update of bug #27770 (project grep):

                  Status:                    None => Duplicate              
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

There's already a patch in the patch tracker, closing as duplicate.

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  <http://savannah.gnu.org/bugs/?27770>

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