Cannot use D struct/class in QList

[ThomasBrixLarsen]

pragma(cppmap, "<QtCore/QList>");
import(C++) Qt, *;

struct Test {}

void main()
{
    QList!Test tests;
}

binary    /usr/bin/ldc2
version   1.18.0-git-26fadd1-dirty (DMD v2.088.0, LLVM 9.0.0)
config    /etc/ldc2.conf (x86_64-pc-linux-gnu)
calypso   driver args: clang -std=c++11 -D_REENTRANT -fPIE -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I/usr/include/qt/mkspecs/linux-g++ -I/usr/include/qt -I/usr/include/qt/QtWidgets -I/usr/include/qt/QtGui -I/usr/include/qt/QtCore -I/usr/include/qt/QtCore/5.13.1 -I/usr/include/qt/QtCore/5.13.1/QtCore -c -x c++-header .calypso_cache/calypso_cache.h 
predefs   LDC all D_Version2 assert D_ModuleInfo D_Exceptions D_TypeInfo X86_64 D_InlineAsm_X86_64 D_HardFloat LittleEndian D_LP64 D_PIC linux Posix CRuntime_Glibc CppRuntime_Gcc LDC_LLVM_900 CppStdLib_libstdcxx
parse     qlist
importall qlist
import    object        (/usr/include/dlang/ldc/object.d)
import    core.internal.array.appending (/usr/include/dlang/ldc/core/internal/array/appending.d)
import    core.internal.array.comparison        (/usr/include/dlang/ldc/core/internal/array/comparison.d)
import    core.internal.array.equality  (/usr/include/dlang/ldc/core/internal/array/equality.d)
import    core.internal.array.casting   (/usr/include/dlang/ldc/core/internal/array/casting.d)
import    core.internal.array.concatenation     (/usr/include/dlang/ldc/core/internal/array/concatenation.d)
import    core.internal.array.construction      (/usr/include/dlang/ldc/core/internal/array/construction.d)
import    core.internal.array.capacity  (/usr/include/dlang/ldc/core/internal/array/capacity.d)
import    core.internal.hash    (/usr/include/dlang/ldc/core/internal/hash.d)
import    core.internal.traits  (/usr/include/dlang/ldc/core/internal/traits.d)
import    core.internal.convert (/usr/include/dlang/ldc/core/internal/convert.d)
import    cpp.core      (/usr/include/dlang/ldc/cpp/core.d)
semantic  qlist
entry     main          qlist.d
semantic2 qlist
semantic3 qlist

Program received signal SIGSEGV, Segmentation fault.
0x000055555723e2c0 in clang::ASTContext::getRecordType(clang::RecordDecl const*) const ()
(gdb) bt
#0  0x000055555723e2c0 in clang::ASTContext::getRecordType(clang::RecordDecl const*) const ()
#1  0x000055555621237a in cpp::DeclMapper::toType(Loc, Type*, Scope*, unsigned long) ()
#2  0x000055555620dd24 in ?? ()
#3  0x000055555620d58d in ?? ()
#4  0x000055555620fe5e in cpp::TemplateDeclaration::getClangInst(Scope*, Array<RootObject*>*) ()
#5  0x0000555556210075 in cpp::TemplateDeclaration::matchWithInstance(Scope*, TemplateInstance*, Array<RootObject*>*, Array<Expression*>*, int) ()
#6  0x0000555555f71f06 in _D3dmd9dtemplate16TemplateInstance13findBestMatchMFPSQBz6dscope5ScopePSQCr4root5array__T5ArrayTCQDq10expression10ExpressionZQBkZb ()
#7  0x0000555555f6f811 in _D3dmd10dsymbolsem24templateInstanceSemanticFCQBs9dtemplate16TemplateInstancePSQCz6dscope5ScopePSQDr4root5array__T5ArrayTCQEq10expression10ExpressionZQBkZv ()
#8  0x0000555555f34cd7 in _D3dmd7typesem7resolveFCQw5mtype4TypeKxSQBm7globals3LocPSQCd6dscope5ScopePCQCv10expression10ExpressionPQDcPCQEc7dsymbol7DsymbolbZv ()
#9  0x0000555556008103 in _D3dmd7typesem12typeSemanticRCQBc5mtype4TypeSQBr7globals3LocPSQCi6dscope5ScopeZ13visitInstanceMFCQDrQCp12TypeInstanceZQDl ()
#10 0x0000555555f35053 in typeSemantic(Type*, Loc, Scope*) ()
#11 0x0000555556040a8a in DsymbolSemanticVisitor::visit(VarDeclaration*) ()
#12 0x0000555555f9122b in ExpressionSemanticVisitor::visit(DeclarationExp*) ()
#13 0x0000555555fdca07 in StatementSemanticVisitor::visit(ExpStatement*) ()
#14 0x0000555555fdcf4a in StatementSemanticVisitor::visit(CompoundStatement*) ()
#15 0x0000555555f2e03e in Semantic3Visitor::visit(FuncDeclaration*) ()
#16 0x0000555555f32241 in Semantic3Visitor::visit(Module*) ()
#17 0x00005555560a38d5 in mars_mainBody(Param&, Array<char const*>&, Array<char const*>&) ()
#18 0x00005555561c696d in cppmain() ()
#19 0x000055555784ba20 in _D2rt6dmain212_d_run_main2UAAamPUQgZiZ6runAllMFZv ()
#20 0x000055555784b82f in _d_run_main2 ()
#21 0x000055555784b68e in _d_run_main ()
#22 0x0000555555ed4ed5 in main ()
#23 0x00007ffff2c1b153 in __libc_start_main () from /usr/lib/libc.so.6
#24 0x0000555555ed6e8e in _start ()

[Syniurge]

Unless this is really blocking, this won't be high priority, making Clang aware of D structs and classes may not be easy at all to implement and I wasn't planning to experiment on it until later.

Not being able to use D classes/structs with Qt templates makes connect() unusable so moc.d had to work around it with connect2().
Can you work around it too without too much hassle or do you have a use case that strongly requires this feature?

[ThomasBrixLarsen]

It's not blocking. I'm porting some existing C++ code to D. So I can change the QList uses to D arrays instead. And use QList with C++ structs/classes until I'm able to port them.

I saw a project to have dmd generate C++ headers. Could it make it easier? At least for extern(C++)?

[ThomasBrixLarsen]

This is not strictly related to the template issue: I've ported a few thousand lines, and so far the most infuriating annoyance, is that stack trace. It always happens in cpp::DeclMapper::toType->clang::ASTContext::getRecordType. I would really like an error instead with a line number.