anonymous struct as a return type in c++11

anonymous-struct.cc

int main()
{
    int mx = [] () -> struct { int x, y ; } { return { 99, 101 } ; } ().x ;
}

compilation-output.txt

$ g++ -std=c++0x anonymous-struct.cc
anonymous-struct.cc: In function ‘int main()’:
anonymous-struct.cc:3:43: error: expected ‘;’ after struct definition
anonymous-struct.cc: In lambda function:
anonymous-struct.cc:3:43: error: expected ‘{’ before ‘;’ token
anonymous-struct.cc: In function ‘int main()’:
anonymous-struct.cc:3:43: error: invalid conversion from ‘main()::<lambda()>::<anonymous struct> (*)()’ to ‘int’ [-fpermissive]
anonymous-struct.cc:3:64: error: cannot convert ‘<brace-enclosed initializer list>’ to ‘int’ in return
anonymous-struct.cc:3:71: error: expected primary-expression before ‘)’ token

$ g++ --version
g++ (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.