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Add erasure of AnyHeapRef-bounded type parameters and better allocator examples #1227

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@gsps gsps commented Jan 18, 2022

This PR improves upon the existing AllocatorMono example by a) adding a variant AllocatorMonoAbstract that abstracts the implementation and simply gives a model of an allocator that could feasibly be used in client code, and b) AllocatorPolyAbstract, a generic variant of the allocator.

To achieve the latter, type parameters on classes and functions upper-bounded by AnyHeapRef are now erased during EffectElaboration.

Drive-by fixes of several bugs in EffectElaboration.

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vkuncak commented Jan 20, 2022

@gsps it is more likely to get merged if it targets main branch

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