[Bug c++/52801] improve selective typedef unwrapping

["egallager at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52801

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic, error-recovery
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-08-18
                 CC|                            |egallager at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
Confirmed that the notes could ease up on the template spew; g++ output is now:

$ /usr/local/bin/g++ -fsyntax-only 52801.cc
52801.cc: In function ‘void foo()’:
52801.cc:9:8: error: no match for ‘operator=’ (operand types are
‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ and
‘std::vector<double>’)
  str = vec;
        ^~~
In file included from /usr/local/include/c++/8.0.0/string:52:0,
                 from 52801.cc:2:
/usr/local/include/c++/8.0.0/bits/basic_string.h:627:7: note: candidate:
‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const
std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char;
_Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
       operator=(const basic_string& __str)
       ^~~~~~~~
/usr/local/include/c++/8.0.0/bits/basic_string.h:627:7: note:   no known
conversion for argument 1 from ‘std::vector<double>’ to ‘const
std::__cxx11::basic_string<char>&’
/usr/local/include/c++/8.0.0/bits/basic_string.h:666:7: note: candidate:
‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const _CharT*)
[with _CharT = char; _Traits = std::char_traits<char>; _Alloc =
std::allocator<char>]’
       operator=(const _CharT* __s)
       ^~~~~~~~
/usr/local/include/c++/8.0.0/bits/basic_string.h:666:7: note:   no known
conversion for argument 1 from ‘std::vector<double>’ to ‘const char*’
/usr/local/include/c++/8.0.0/bits/basic_string.h:677:7: note: candidate:
‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(_CharT) [with
_CharT = char; _Traits = std::char_traits<char>; _Alloc =
std::allocator<char>]’
       operator=(_CharT __c)
       ^~~~~~~~
/usr/local/include/c++/8.0.0/bits/basic_string.h:677:7: note:   no known
conversion for argument 1 from ‘std::vector<double>’ to ‘char’
/usr/local/include/c++/8.0.0/bits/basic_string.h:695:7: note: candidate:
‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits,
_Alloc>::operator=(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with
_CharT = char; _Traits = std::char_traits<char>; _Alloc =
std::allocator<char>]’
       operator=(basic_string&& __str)
       ^~~~~~~~
/usr/local/include/c++/8.0.0/bits/basic_string.h:695:7: note:   no known
conversion for argument 1 from ‘std::vector<double>’ to
‘std::__cxx11::basic_string<char>&&’
/usr/local/include/c++/8.0.0/bits/basic_string.h:749:7: note: candidate:
‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits,
_Alloc>::operator=(std::initializer_list<_Tp>) [with _CharT = char; _Traits =
std::char_traits<char>; _Alloc = std::allocator<char>]’
       operator=(initializer_list<_CharT> __l)
       ^~~~~~~~
/usr/local/include/c++/8.0.0/bits/basic_string.h:749:7: note:   no known
conversion for argument 1 from ‘std::vector<double>’ to
‘std::initializer_list<char>’
$