llvm dev - Apr 2018 - weird behaviour of llvm::linker::LinkInModule()

<div>Hello!</div><div>I created a new llvm module
(<strong>A</strong>) - to create a 'glue'
code.</div><div>I want to call some functions from another module
(<strong>B</strong>);</div><div>I load module
<strong>B</strong> withing the same LLVMContext, and create a
function declaration in module A via:</div><div>    auto
functionInAnotherModule =
ModuleB.getFunction(callableName);</div><div>    auto functionType =
functionInAnotherModule->getFunctionType();</div><div>    auto
localFunction = llvm::Function::Create(functionType,
llvm::GlobalValue::LinkageTypes::ExternalWeakLinkage, callableName,
&ModuleA);</div><div> </div><div>    Function seems
to be copied, together with complex types its using:</div><div>    ;
ModuleID = 'JitModule'</div><div>    source_filename =
"JitModule"   </div><div>    %struct._EN12RecordStreamE =
type { %class.RecordStream }</div><div>    declare extern_weak void
@_EN12RecordStream4InitEPTsN18_EN12RecordStreamEEPvv(%struct._EN12RecordStreamE*,
i8*)</div><div>   </div><div>    ... But later I'm
not able to link in ModuleB to ModuleA using
linker.linkInModule(std::move(ModuleB));</div><div>    llvm says:
Assertion failed: !(Pair.first != Ty && Pair.second == Ty) &&
"mapping to a source
type",...</div><div> </div><div>    Could someone
point me what conceptually I did wrong?</div>