[LLVMbugs] [Bug 21827] New: [fuzz] Assertion `Length < Tok.getLength() && "NeedsCleaning flag set on token that didn't need cleaning!"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21827

            Bug ID: 21827
           Summary: [fuzz] Assertion `Length < Tok.getLength() &&
                    "NeedsCleaning flag set on token that didn't need
                    cleaning!"' 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 13468
  --> http://llvm.org/bugs/attachment.cgi?id=13468&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:

needscleaning.cpp:1:5: error: builtin feature check macro requires a
parenthesized identifier
#if __has_feature('\
    ^
clang-3.6: tools/clang/lib/Lex/Lexer.cpp:282: size_t getSpellingSlow(const
clang::Token &, const char *, const clang::LangOptions &, char *): Assertion
`Length < Tok.getLength() && "NeedsCleaning flag set on token that didn't need
cleaning!"' failed.

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