[LLVMbugs] [Bug 9026] New: Assertion about "conversion sequence "

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9026

           Summary: Assertion about "conversion sequence "
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Clang fails on

------------------------
class InfallibleTArray {
};
class Variant;
class CompVariant {
  operator const InfallibleTArray&() const;
};
class Variant {
  operator const CompVariant&() const;
};
void     Write(             const Variant& __v);
void     Write(             const InfallibleTArray& __v);
Variant x;
void Write2() {
  Write(x);
}
------------------------

with

Assertion failed: (false && "Can only end up with a standard conversion
sequence or failure"), function AddConversionCandidate, file
/Users/espindola/llvm/clang/lib/Sema/SemaOverload.cpp, line 4024.
0  clang             0x0000000101001992 PrintStackTrace(void*) + 34
1  clang             0x0000000101001f39 SignalHandler(int) + 857
2  libSystem.B.dylib 0x00007fff80ed867a _sigtramp + 26
3  clang             0x00000001005be33a
clang::CXXBasePaths::lookupInBases(clang::ASTContext&, clang::CXXRecordDecl
const*, bool (*)(clang::CXXBaseSpecifier const*, clang::CXXBasePath&, void*),
void*) + 234
4  clang             0x0000000100019e26 abort + 22
5  clang             0x0000000100019de8 __assert_rtn + 56
6  clang             0x00000001003b0ea2
clang::Sema::AddConversionCandidate(clang::CXXConversionDecl*,
clang::DeclAccessPair, clang::CXXRecordDecl*, clang::Expr*, clang::QualType,
clang::OverloadCandidateSet&) + 2178
7  clang             0x00000001003c5f97
clang::FindConversionForRefInit(clang::Sema&,
clang::ImplicitConversionSequence&, clang::QualType, clang::Sou

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