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	// CHECK-LABEL: OptionalGroupB::print			// CHECK-LABEL: OptionalGroupB::print
	// CHECK: if (!(*this)->getAttr("a"))			// CHECK: if (!(*this)->getAttr("a"))
	// CHECK-NEXT: odsPrinter << ' ' << "foo"			// CHECK-NEXT: odsPrinter << ' ' << "foo"
	// CHECK-NEXT: else			// CHECK-NEXT: else
	// CHECK-NEXT: odsPrinter << ' ' << "bar"			// CHECK-NEXT: odsPrinter << ' ' << "bar"
	def OptionalGroupB : TestFormat_Op<[{			def OptionalGroupB : TestFormat_Op<[{
	(`foo`) : (`bar` $a^)? attr-dict			(`foo`) : (`bar` $a^)? attr-dict
	}]>, Arguments<(ins UnitAttr:$a)>;			}]>, Arguments<(ins UnitAttr:$a)>;

				// Optional group anchored on a default-valued attribute:
				// CHECK-LABEL: OptionalGroupC::parse
				// CHECK: if ((*this)->getAttr("a") != ::mlir::OpBuilder(getContext()).getStringAttr("default")) {
				// CHECK-NEXT: odsPrinter << ' ';
				// CHECK-NEXT: odsPrinter.printAttributeWithoutType(getAAttr());
				// CHECK-NEXT: }
				def OptionalGroupC : TestFormat_Op<[{
				($a^)? attr-dict
				}]>, Arguments<(ins DefaultValuedAttr<StrAttr, "\"default\"">:$a)>;