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Add a dedicated MissingType node with singleton construction, node-kind recognition, structural hooks, and Python and script support. Preserve non-nullable types and reject missing types at fully typed boundaries.
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Introduce an empty final
MissingTypenode whose construction returns a singleton for type information that has not been supplied or computed. Recognize missing types through C++as<MissingType>()and Pythonisinstance, preserving node-kind semantics after serialization and the existing type factories.Integrate reflection, structural traversal and TVMScript printing, and reject missing operands before Relax type-analysis shortcuts that require populated types.
Typeremains non-nullable.