[LLVMbugs] [Bug 21840] New: [fuzz] Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21840

            Bug ID: 21840
           Summary: [fuzz] Assertion `isa<X>(Val) && "cast<Ty>() argument
                    of incompatible type!"' 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 13481
  --> http://llvm.org/bugs/attachment.cgi?id=13481&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: include/llvm/Support/Casting.h:237: typename cast_retty<X, Y
*>::ret_type llvm::cast(Y *) [X = clang::FieldDecl, Y = clang::Decl]: Assertion
`isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.

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