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

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Apr 8 13:23:28 PDT 2014


            Bug ID: 19373
           Summary: clang erroneously enforcing alias template parameter
           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

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

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

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


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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