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	class Region<Pred condition, string descr = ""> :			class Region<Pred condition, string descr = ""> :
	RegionConstraint<condition, descr>;			RegionConstraint<condition, descr>;

	// Any region.			// Any region.
	def AnyRegion : Region<CPred<"true">, "any region">;			def AnyRegion : Region<CPred<"true">, "any region">;

	// A region with the given number of blocks.			// A region with the given number of blocks.
	class SizedRegion<int numBlocks> : Region<			class SizedRegion<int numBlocks> : Region<
	CPred<"$_self.getBlocks().size() == " # numBlocks>,			CPred<"llvm::hasNItems($_self, " # numBlocks # ")">,
	"region with " # numBlocks # " blocks">;			"region with " # numBlocks # " blocks">;

	// A variadic region constraint. It expands to zero or more of the base region.			// A variadic region constraint. It expands to zero or more of the base region.
	class VariadicRegion<Region region>			class VariadicRegion<Region region>
	: Region<region.predicate, region.description>;			: Region<region.predicate, region.description>;

	//===----------------------------------------------------------------------===//			//===----------------------------------------------------------------------===//
	// Successor definitions			// Successor definitions
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[MLIR][NFC] Adopt hasNItems() for SizedRegion predicateClosedPublic