[Bug c++/52487] New: [4.6/4.7 Regression] [C++11] ICE at cp/semantics.c:5613 with lambda capturing reference to incomplete type by value

[hevanen at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52487

             Bug #: 52487
           Summary: [4.6/4.7 Regression] [C++11] ICE at
                    cp/semantics.c:5613 with lambda capturing reference to
                    incomplete type by value
    Classification: Unclassified
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: heva...@googlemail.com


The following code snippet causes an ICE:

struct A;
void foo(A& a)
{
  [=](){a;};
}

int main() {}


Confirmed with
gcc version 4.6.1 20110409 (prerelease) (Ubuntu 4.6.0-3~ppa1) and
GNU C++ (niXman build) version 4.7.0 20120203 (experimental) (i686-pc-mingw32)

The latter prints:
internal compiler error: in literal_type_p, at cp/semantics.c:5613

There is no ICE with this version:
GNU C++ (Ubuntu/Linaro 4.5.2-8ubuntu4) version 4.5.2 (x86_64-linux-gnu)
Instead, it prints the expected error message ("invalid use of incomplete type
‘struct A’").