[LLVMbugs] [Bug 16975] New: Crash with inherited constructor that uses the class's template parameter pack in a template default argument

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16975

            Bug ID: 16975
           Summary: Crash with inherited constructor that uses the class's
                    template parameter pack in a template default argument
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sebastian.redl at getdesigned.at
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Have a variadic template class. Give it a templated constructor that uses the
parameter pack in a default argument for SFINAE tricks. Inherit that
constructor in a derived class and use it. Boom!

Tested with tip-of-tree Release+Asserts Clang:
clang -cc1 -fsyntax-only -disable-free -O0 -Werror -std=c++11 -x c++
concat-bug2.cpp

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