[Bug c++/66672] std::is_same wrong result for captured reference value inside a lambda

["hacoo36 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66672

Henry Cooney <hacoo36 at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |hacoo36 at gmail dot com

--- Comment #1 from Henry Cooney <hacoo36 at gmail dot com> ---
I tested this behavior as of g++ 7.2.0; is_same<decltype((j)), ...> still seems
to indicate that j is an int& inside the lambda. 

I think this behavior is probably incorrect WRT the language spec. For example,
the following code produces a compile-time error ('assignment of read-only
variable 'j''):

====
int main() {
  int i = 100;
  int &j = i;
  cout << j;
  [=]() 
  {
    cout << is_same<decltype((j)), int      &>::value
         << is_same<decltype((j)), int const&>::value;
    cout << endl;
    j = j + 1;
  }();

  cout << j;
}
====

That suggests that the correct type of j is indeed int const&, not int&!