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Richard Eisenberg authored
Previously, I had inexplicably decided that (->)'s roles were all Representational. But, of course, its first two parameters are *dependent* RuntimeReps. All dependent parameters have a Nominal role, because all roles in kinds are Nominal. Fix is easy, but I have no idea how the world hasn't come crashing down before now. This was found while investigating #15801, which requires visible type application in types to observe. Hence, the test case will come with the main patch for #12045.
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