t.Run(tc.name, func(t *testing.T) {
			var targetNode checker.AstNode = testSizeNode{size: tc.targetSize}
			argNodes := make([]checker.AstNode, len(tc.argSizes))
			for i, arg := range tc.argSizes {
				argNodes[i] = testSizeNode{size: arg}
			}
			result := est.EstimateCallCost(tc.function, tc.overload, &targetNode, argNodes)
			if result.ResultSize == nil {
				t.Fatalf("Expected ResultSize but got none")
			}