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This was caused by a forward reference of a nested struct changing the TYPE_MODE of its enclosing struct type to be incorrectly inferred as an integer mode. Fixed by setting TREE_ADDRESSABLE early, and moving the mode setting and propagation to finish_aggregate_mode and finish_aggregate_type respectively, rather than at the end of the visitor method for TypeStruct. PR d/125089 gcc/d/ChangeLog: * types.cc (finish_aggregate_mode): Explicitly set TYPE_MODE of non-POD types here. (finish_aggregate_type): Propagate TREE_ADDRESSABLE to all variants. (TypeVisitor::visit (TypeStruct *)): Set TREE_ADDRESSABLE before visiting struct members. gcc/testsuite/ChangeLog: * gdc.dg/pr125089.d: New test.
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