[LLVMbugs] [Bug 19373] New: clang erroneously enforcing alias template parameter kind

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19373

            Bug ID: 19373
           Summary: clang erroneously enforcing alias template parameter
                    kind
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eric at boostpro.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Gcc 4.8.2 accepts the following code. I think it's legal, but I'm far from
certain.

///////////////////////////////////////
template<typename T, typename...Us>
using X = T;

template<template<typename...> class T>
struct S
{
    template<typename...Us>
    using X = T<Us...>;
};

int main()
{
    S<X>::X<int, char *> i = 0;
}
///////////////////////////////////////

Result:

test.cpp:8:17: error: pack expansion used as argument for non-pack parameter of
alias template
    using X = T<Us...>;
                ^~~~~
test.cpp:13:5: note: in instantiation of template class 'S<X>' requested here
    S<X>::X<int, char *> i = 0;
    ^
test.cpp:1:19: note: template parameter is declared here
template<typename T, typename...Us>
                  ^

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