[LLVMbugs] [Bug 18499] New: Nested Variadic Expansions in generic lambdas don't work

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18499

            Bug ID: 18499
           Summary: Nested Variadic Expansions in generic lambdas don't
                    work
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++1y
          Assignee: unassignedclangbugs at nondot.org
          Reporter: faisalv at yahoo.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

This code results in a crash:

auto K = [](auto ... OuterArgs) {
      vp([=](auto ... Is) {
          decltype(OuterArgs) OA = OuterArgs;
          return 0;
        }(5)...);
      return 0;
    };

 auto M = K('a', ' ', 1, " -- ", 3.14);

Assertion failed: !Unexpanded.empty() && "Unable to find unexpanded parameter
packs", file \llvm\tools\clang\lib\Sema\SemaTemplateVariadic.cpp, line 281

If this is prioritized as important enough to fix, a patch that is in the
works, can be moved up in my queue :)

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