[LLVMbugs] [Bug 23028] New: No diagnostic for function parameter pack with default argument

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23028

            Bug ID: 23028
           Summary: No diagnostic for function parameter pack with default
                    argument
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: oktal3700 at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Ubuntu clang version 3.7.0-svn229234-1~exp1 and in earlier versions.

The following (ill formed) code is accepted by clang: http://goo.gl/jKa8Q7

template <typename... Ts>
void f(Ts... = 0) {}

int main() {
  f(42);
}

8.3.6/3: A default argument shall not be specified for a parameter pack.

>From http://stackoverflow.com/q/29098835/1639256

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