[LLVMbugs] [Bug 21815] New: Assertion `CachedTokens[CachedLexPos-1].getLastLoc() == Tok.getAnnotationEndLoc() && "The annotation should be until the most recent cached token"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21815

            Bug ID: 21815
           Summary: Assertion `CachedTokens[CachedLexPos-1].getLastLoc()
                    == Tok.getAnnotationEndLoc() && "The annotation should
                    be until the most recent cached token"' 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 13457
  --> http://llvm.org/bugs/attachment.cgi?id=13457&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/lib/Lex/PPCaching.cpp:101: void
clang::Preprocessor::AnnotatePreviousCachedTokens(const clang::Token &):
Assertion `CachedTokens[CachedLexPos-1].getLastLoc() ==
Tok.getAnnotationEndLoc() && "The annotation should be until the most recent
cached token"' failed.

This test case in particular is very small; it merely contains "a (::(".

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