https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101213

            Bug ID: 101213
           Summary: Improve support for decltype(std)
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: llvm at rifkin dot dev
  Target Milestone: ---

Gcc treats decltype(std) as an integer. It only works in some situations
though:

// OK
decltype(std) a;
static_assert(std::is_same<int, decltype(a)>::value);

// Not OK
static_assert(std::is_same<int, decltype(std)>::value);

// OK
decltype(std) a;
using b = decltype(a);
using c = b;

// Not OK
using a = decltype(std);
using b = a;

decltype(std) foo(int a) {} // OK
auto foo() -> decltype(std) {} // OK
void foo(decltype(std) a) {} // Not OK

// Not OK
std::vector<decltype(std)> v;

This bug is hilarious please improve support for it and make it a feature :)
It's invaluable for code bowling and nerd sniping.

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