[Bug c++/16071] New: Bad error message

["igodard at pacbell dot net" <gcc-bugzilla at gcc dot gnu dot org>]

In:

#include    <iostream>
class A{};

template<typename T>
void    Baz(const T& t) {}
void    Baz(const A& i) {}

int main() {
    A a;
    Baz(std::endl);
    }


you get:

~/ootbc/common/test/src$ g++ foo1.cc
foo1.cc: In function `int main()':
foo1.cc:10: error: invalid initialization of reference of type 'const A&' from expression of type '<unknown type>'
foo1.cc:6: error: in passing argument 1 of `void Baz(const A&)'


The actual bug is an ambiguous overload resolution because endl is an overloaded function, and you should get a standard ambiguity message cascad listing the candidate resolutions. "unknown type" is lame; at worst you should list the possible types when there are more than one. And it appears that the compiler is attempting to invode the "void    Baz(const A& i) {}" overload, which does not match *any* of the candidates as all eligable ambiguities are on the other (templated) overload.

Ivan

-- 
           Summary: Bad error message
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: igodard at pacbell dot net
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16071