[Bug c++/56699] New: Failed for sizeof (non-static member) in lambda expression

["frankhb1989 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56699

             Bug #: 56699
           Summary: Failed for sizeof (non-static member) in lambda
                    expression
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: frankhb1989@gmail.com


Here are the minimal testcases:

Case 1:

struct A
{
    int a;
};

struct T
{
    int x;

    T() : x([]{
        sizeof(::A::a);
        return 0;
    }())
    {}
};

Case 2:

struct A
{
    int a;
};

void f()
{
    []{sizeof(A::a);};
}

Tested at coliru.stacked-crooked.com (g++ -v shows it's a x86-64 linux host):

Case 1:
$ g++-4.8 -fsyntax-only -std=c++11 main.cpp
main.cpp: In lambda function:
main.cpp:11:15: error: type 'A' is not a base type for type 'T'
   sizeof(::A::a);
               ^
Case 2:
$ g++-4.8 -fsyntax-only -std=c++11 main.cpp
main.cpp: In lambda function:
main.cpp:10:15: internal compiler error: Segmentation fault
  []{sizeof(A::a);};
               ^

I have exactly the same errors for both cases using mingw-builds
4.8.0(i686-w64-mingw32) compiled today from sf.net on my Win7 x64 host.

>From some others, I've heard Case 1 is accepted by g++-4.8 compiled just now on
Ubuntu12.04, but the ICE still exists for Case 2.

G++ 4.7 accepts both cases.