[llvm-bugs] [Bug 25501] New: Clang crashes with -fmodules to compile clang-interpreter/main.cpp

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25501

            Bug ID: 25501
           Summary: Clang crashes with -fmodules to compile
                    clang-interpreter/main.cpp
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: geek4civic at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk
    Classification: Unclassified

Created attachment 15270
  --> https://llvm.org/bugs/attachment.cgi?id=15270&action=edit
Reduced-testcase.zip (requires external libc++)

$ clang++ -std=c++11 -stdlib=libc++ -I llvm/include -I clang/include
-fsyntax-only -fmodules clang-interpreter-main.cpp

clang-3.8: clang/lib/Serialization/ASTReaderDecl.cpp:1493: void
clang::ASTDeclReader::MergeDefinitionData(clang::CXXRecordDecl *, struct
CXXRecordDecl::DefinitionData &&): Assertion
`Reader.Lookups.find(MergeDD.Definition) == Reader.Lookups.end() && "already
loaded pending lookups for merged definition"' failed.

A reduced testcase is attached. Excuse me, I haven't reduced libc++.

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