According to n2531, the new C++0x initializer-list is allowed in []. 

Test Case:

#include <map>

void test(void)
{
        std::map<std::pair<int,int>,int> the_map;
        the_map[{0,1}] = 5;
}

Error:
/tmp/test.cc: In function ‘void test()’:
/tmp/test.cc:6: error: expected primary-expression before ‘{’ token
/tmp/test.cc:6: error: expected ‘]’ before ‘{’ token
/tmp/test.cc:6: error: expected ‘;’ before ‘{’ token
/tmp/test.cc:6: error: expected primary-expression before ‘]’ token
/tmp/test.cc:6: error: expected ‘;’ before ‘]’ token

Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --enable-languages=c++ --enable-shared
--enable-threads=posix --enable-__cxa_atexit --disable-multilib
--disable-bootstrap --prefix /Users/cougar/local/gcc45 : (reconfigured)
./config
ure --enable-shared --enable-threads=posix --enable-__cxa_atexit
--disable-multilib --disable-bootstrap --prefix /Users/cougar/local/gcc45
--enable-languages=c,c++ --no-create --no-recursion
Thread model: posix
gcc version 4.5.0 20090425 (experimental) (GCC)


-- 
           Summary: [C++0x] Initializer list not allowed in []
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tom dot prince at ualberta dot net
  GCC host triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39901

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