This is especially important because in order to use abstract types in a module, you need to convert the record to an existential type, which requires a subsumption expression (mod M = (r : );). This means that the user will nearly always be specifying the type on the right hand side (in the subsumption expression) anyway, so it would be a huge pain to have to repeat it on the left hand side as well. To handle such cases, we need early type propagation to propagate type information before type inference.
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