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Promised interfaces allow for a dialect to "promise" the implementation of an interface, i.e. declare that it supports an interface, but have the interface defined in an extension in a library separate from the dialect itself. A promised interface is powerful in that it alerts the user when the interface is attempted to be used (e.g. via cast/dyn_cast/etc.) and the implementation has not yet been provided. This makes the system much more robust against misconfiguration, and ensures that we do not lose the benefit we currently have of defining the interface in the dialect library. Differential Revision: https://reviews.llvm.org/D120368