The Swift Syntax APIs aren't subject to Swift Evolution review. But yes, as you've observed, "Decl" and "Expr" are terms-of-art adopted in the user-facing API of Swift Syntax.
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The Swift Syntax APIs aren't subject to Swift Evolution review. But yes, as you've observed, "Decl" and "Expr" are terms-of-art adopted in the user-facing API of Swift Syntax.