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Subject: [Bug c++/56084] poor error recovery for missing ";"
Date: Wed, 23 Jan 2013 16:25:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56084

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-01-23
     Ever Confirmed|0                           |1

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-01-23 16:25:18 UTC ---
This reduces to:

struct ostream { };

struct A {
    int i;
}

ostream& operator<<(ostream& o, const A&) { return o; }

int main()
{
    A a;
    ostream o;
    o << a;
}

which still gives a poor error that doesn't identify the problem, but it
doesn't give pages of errors because there is only one operator<< in scope

x.cc:7:8: error: expected initializer before '&' token
 ostream& operator<<(ostream& o, const A&) { return o; }
        ^
x.cc: In function 'int main()':
x.cc:13:7: error: no match for 'operator<<' (operand types are 'ostream' and
'A')
     o << a;
       ^

(Separately, I'm investigating whether there's some way to reduce the output
when an invalid ostream operation is done, because the sheer number of
overloads of operator<< causes pages of output due to G++'s verbose, and
usually very useful, output describing argument deduction errors.)