add comment explaining the check
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@ -330,6 +330,8 @@ impl<'tcx> LayoutLlvmExt<'tcx> for TyAndLayout<'tcx> {
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ty::Ref(..) | ty::RawPtr(_) => {
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ty::Ref(..) | ty::RawPtr(_) => {
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return self.field(cx, index).llvm_type(cx);
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return self.field(cx, index).llvm_type(cx);
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}
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}
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// only wide pointer boxes are handled as pointers
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// thin pointer boxes with scalar allocators are handled by the general logic below
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ty::Adt(def, substs) if def.is_box() && cx.layout_of(substs.type_at(1)).is_zst() => {
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ty::Adt(def, substs) if def.is_box() && cx.layout_of(substs.type_at(1)).is_zst() => {
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let ptr_ty = cx.tcx.mk_mut_ptr(self.ty.boxed_ty());
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let ptr_ty = cx.tcx.mk_mut_ptr(self.ty.boxed_ty());
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return cx.layout_of(ptr_ty).scalar_pair_element_llvm_type(cx, index, immediate);
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return cx.layout_of(ptr_ty).scalar_pair_element_llvm_type(cx, index, immediate);
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