[Bug c++/61400] New: suffix return type doesn't work for member functions

["yyc1992 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61400

            Bug ID: 61400
           Summary: suffix return type doesn't work for member functions
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yyc1992 at gmail dot com

The following code compiles on clang++ but not on g++ 4.9.0.

```
struct A {
    template<int i>
    inline int
    a()
    {
        return 0;
    }
    template<int i>
    inline auto
    b() -> decltype(a<i>())
    {
        return a<i>();
    }
};

int
main()
{
    A a;
    a.b<2>();
}
```

g++ can compile it if I change `decltype(a<i>())` to `decltype(this->a<i>())`

System Info.

ArchLinux x86_64 with [testing] [multilib] and [multilib-testing] enabled.
Using official gcc package from ArchLinux.
Command line to compile the program above

g++/clang++ --std=c++11 gcc.cpp -c

where gcc.cpp is the name of the source file.