func usage() {
	fmt.Fprintf(os.Stderr, "usage: go tool fix [-diff] [-r fixname,...] [-force fixname,...] [path ...]\n")
	flag.PrintDefaults()
	fmt.Fprintf(os.Stderr, "\nAvailable rewrites are:\n")
	sort.Sort(byName(fixes))
	for _, f := range fixes {
		if f.disabled {
			fmt.Fprintf(os.Stderr, "\n%s (disabled)\n", f.name)
		} else {
			fmt.Fprintf(os.Stderr, "\n%s\n", f.name)
		}
		desc := strings.TrimSpace(f.desc)

					out, out2)
				tdiff(t, "first", out, "second", out2)
			}
		})
	}
}

func tdiff(t *testing.T, aname, a, bname, b string) {
	t.Errorf("%s", diff.Diff(aname, []byte(a), bname, []byte(b)))

	// that source code) for all modules that are necessary to ensure that imports
	// are unambiguous. That also produces clearer diagnostics, since we can say
	// exactly what happened to the package if it became ambiguous or disappeared
	// entirely.
	//
	// We re-resolve the packages in parallel because this process involves disk
	// I/O to check for package sources, and because the process of checking for

		last.Block = bEnd
		last.reset(OpWBend)
		last.Pos = last.Pos.WithNotStmt()
		last.Type = types.TypeMem
		last.AddArg(mem)

		// Free all the old stores, except last which became the WBend marker.
		for _, w := range stores {
			if w != last {
				w.resetArgs()
			}
		}
		for _, w := range stores {
			if w != last {
				f.freeValue(w)
			}
		}

	// of packages in "all", so that 'go test all' can be run without checksum
	// errors.
	// See https://go.dev/issue/56222.
	TidyGoModSumVersion = "1.21"

	// goStrictVersion is the Go version at which the Go versions
	// became "strict" in the sense that, restricted to modules at this version
	// or later, every module must have a go version line ≥ all its dependencies.
	// It is also the version after which "too new" a version is considered a fatal error.