[LLVMbugs] [Bug 21863] New: [fuzz] Assertion `!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && "Already set to a class template partial specialization!"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21863

            Bug ID: 21863
           Summary: [fuzz] Assertion
                    `!SpecializedTemplate.is<SpecializedPartialSpecializat
                    ion*>() && "Already set to a class template partial
                    specialization!"' 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 13504
  --> http://llvm.org/bugs/attachment.cgi?id=13504&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:

clang-3.6: tools/clang/include/clang/AST/DeclTemplate.h:1575: void
clang::ClassTemplateSpecializationDecl::setInstantiationOf(clang::ClassTemplatePartialSpecializationDecl
*, const clang::TemplateArgumentList *): Assertion
`!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && "Already set
to a class template partial specialization!"' failed.

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