[Bug 1172951] Re: gcc 4.7.3-1ubuntu10 c++11 bogus errors (reduced, not reproducible upstream)

[Matthias Klose]

** Package changed: gcc-defaults (Ubuntu) => gcc-4.7 (Ubuntu)

** Changed in: gcc-4.7 (Ubuntu)
   Importance: Undecided => Medium

** Changed in: gcc-4.7 (Ubuntu)
       Status: New => Confirmed

** Bug watch added: GCC Bugzilla #56388
   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56388

** Also affects: gcc via
   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56388
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1172951

Title:
  gcc 4.7.3-1ubuntu10 c++11 bogus errors (reduced, not reproducible
  upstream)

Status in The GNU Compiler Collection:
  Unknown
Status in “gcc-4.7” package in Ubuntu:
  Confirmed

Bug description:
  This code:

  namespace NS {

  struct A
  {
    static void foo(int);
    
    template<typename Func>
    void func(Func f)
    {
      [&](){
        do {
  	do {
  	  if (1)
  	    foo(0);
  	} while(0);
        } while (0);
      };
    }
  };

  }

  void caller()
  {
    NS::A a;
    a.func([&]{});
  }

  Fails like this on Raring:

  redeclaration_bug.cc: In instantiation of 'NS::A::func(Func) [with Func = caller()::<lambda()>]::<lambda()>':
  redeclaration_bug.cc:14:11:   required from 'struct NS::A::func(Func) [with Func = caller()::<lambda()>]::<lambda()>'
  redeclaration_bug.cc:10:5:   required from 'void NS::A::func(Func) [with Func = caller()::<lambda()>]'
  redeclaration_bug.cc:26:15:   required from here
  redeclaration_bug.cc:14:11: error: redeclaration of 'NS::A* const NS::A::func(Func) [with Func = caller()::<lambda()>]::<lambda()>::__this'
  redeclaration_bug.cc:14:11: note: previous declaration 'NS::A* const NS::A::func(Func) [with Func = caller()::<lambda()>]::<lambda()>::__this'
  redeclaration_bug.cc:14:11: error: redeclaration of 'NS::A* const this'
  redeclaration_bug.cc:14:11: error: 'NS::A* const this' previously declared here
  redeclaration_bug.cc: In instantiation of 'void NS::A::func(Func) [with Func = caller()::<lambda()>]':
  redeclaration_bug.cc:26:15:   required from here
  redeclaration_bug.cc:10:5: error: too many initializers for 'NS::A::func(Func) [with Func = caller()::<lambda()>]::<lambda()>'

  It compiles fine on Fedora 18's gcc 4.7.2 as well as a version of the
  upstream 4.7 branch that I just built today.  (The latter calls itself
  4.7.4.)

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