2ad6a39fea
apply query response: actually define opaque types
not sure whether this fixes any code considering that #107891 doesn't break anything, but this is currently wrong as the `eq` there should just always fail right now.
We can definitely hit this code if we remove the `replace_opaque_types_with_inference_vars` hack. Doing so without this PR causes a few tests to ICE, e.g.
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