[LLVMbugs] [Bug 15575] New: Bogus error when calling variadic template member function

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15575

            Bug ID: 15575
           Summary: Bogus error when calling variadic template member
                    function
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zeratul976 at hotmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

For the following code:


struct blank {};

template <typename T>
struct result_builder
{
    template <typename... Blanks>
    void apply(Blanks... blanks);
};

template <typename T>
void waldo()
{
    result_builder<T> r;
    typedef decltype(r.apply(blank{})) wally;
};

int main()
{
    waldo<int>();
}


clang (r177790) gives the following compiler error:


test.cpp:131:24: error: no matching member function for call to 'apply'
    typedef decltype(r.apply(blank{})) wally;
                     ~~^~~~~
test.cpp:136:5: note: in instantiation of function template specialization 'wal
    waldo<int>();
    ^
test.cpp:124:10: note: candidate function not viable: requires 0 arguments, but
    void apply(Blanks... blanks);
         ^


I believe this code is valid. It compiles with GCC.

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