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FragmentKind played two roles: * entry point to the parser * syntactic category of a macro call These are different use-cases, and warrant different types. For example, macro can't expand to visibility, but we have such fragment today. This PR introduces `ExpandsTo` enum to separate this two use-cases. I suspect we might further split `FragmentKind` into `$x:specifier` enum specific to MBE, and a general parser entry point, but that's for another PR!