[LLVMbugs] [Bug 21826] New: [fuzz] Assertion `!Unexpanded.empty() && "Unable to find unexpanded parameter packs"' failed.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Dec 10 13:06:25 PST 2014


            Bug ID: 21826
           Summary: [fuzz] Assertion `!Unexpanded.empty() && "Unable to
                    find unexpanded parameter packs"' failed.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sami.liedes at iki.fi
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13467
  --> http://llvm.org/bugs/attachment.cgi?id=13467&action=edit
test case

Fuzzing discovered that the attached test case, when given as input to

  clang -fno-crash-diagnostics -std=c++11 -xc++ -c -emit-llvm

causes this assertion failure:

unexpanded-parm-pack.cpp:1:24: error: expected ']'
template <int... N> a[N
unexpanded-parm-pack.cpp:1:22: note: to match this '['
template <int... N> a[N
unexpanded-parm-pack.cpp:1:21: error: C++ requires a type specifier for all
template <int... N> a[N
clang-3.6: tools/clang/lib/Sema/SemaTemplateVariadic.cpp:281: bool
clang::TypeSourceInfo *, clang::Sema::UnexpandedParameterPackContext):
Assertion `!Unexpanded.empty() && "Unable to find unexpanded parameter packs"'

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