if err == nil {
		t.Errorf("archive/zip.NewReader: expected error when negative size is passed")
	}
}

func messWith(fileName string, corrupter func(b []byte)) (r io.ReaderAt, size int64) {
	data, err := os.ReadFile(filepath.Join("testdata", fileName))
	if err != nil {
		panic("Error reading " + fileName + ": " + err.Error())
	}
	corrupter(data)
	return bytes.NewReader(data), int64(len(data))
}

			if fields := strings.Fields(l); len(fields) == 3 {
				directive := fields[1]
				funcName := fields[2]
				if directive == "nocallback" {
					fatalf("#cgo nocallback disabled until Go 1.23")
					f.NoCallbacks[funcName] = true
				} else if directive == "noescape" {
					fatalf("#cgo noescape disabled until Go 1.23")
					f.NoEscapes[funcName] = true
				}
			}
		}
	}
	f.Preamble = strings.Join(linesOut, "\n")
}

}

// Execute f on each test case.  funcName should be the name of f; it's used
// in failure reports.
func runIndexTests(t *testing.T, f func(s, sep []byte) int, funcName string, testCases []BinOpTest) {
	for _, test := range testCases {
		a := []byte(test.a)
		b := []byte(test.b)
		actual := f(a, b)
		if actual != test.i {
			t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, b, actual, test.i)
		}
	}