This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
The format macros that are part of <inttypes.h> (incorporated into C++11 as <cinttypes>) are conventionally written with no whitespace separating them from the rest of the format string, e.g.,
printf("foo = "PRIu32", bar = "PRIi8"\n", foo, bar); printf("baz = "PRIu32"\n", baz);
This usage conflicts with user-defined literals.
Rationale (October, 2012):
CWG felt that whether this form of these macros needed to be supported in C++ should be examined by EWG.
Rationale (February, 2014):
EWG determined that no action should be taken on this issue.