FormatGNU

	// Schily's tar format, which is incompatible with USTAR.
	// This does not cover STAR extensions to the PAX format; these fall under
	// the PAX format.
	formatSTAR

	formatMax
)

func (f Format) has(f2 Format) bool   { return f&f2 != 0 }
func (f *Format) mayBe(f2 Format)     { *f |= f2 }
func (f *Format) mayOnlyBe(f2 Format) { *f &= f2 }
func (f *Format) mustNotBe(f2 Format) { *f &^= f2 }

			arg = buf.String()
		}
		args[i] = arg
	}
	return fmt.Sprintf(format, args...)
}

// check may be nil.
func (check *Checker) sprintf(format string, args ...any) string {
	var qf Qualifier
	if check != nil {
		qf = check.qualifier
	}
	return sprintf(qf, false, format, args...)
}

func (check *Checker) trace(pos syntax.Pos, format string, args ...any) {
	fmt.Printf("%s:\t%s%s\n",
		pos,

        assertEquals("0 kB", format.format(_0_bytes, ScaleUnit.KILOBYTE));
        assertEquals("0 MB", format.format(_0_bytes, ScaleUnit.MEGABYTE));
        assertEquals("0 GB", format.format(_0_bytes, ScaleUnit.GIGABYTE));

        long _5_bytes = 5L;
        assertEquals("5 B", format.format(_5_bytes));
        assertEquals("5 B", format.format(_5_bytes, ScaleUnit.BYTE));
        assertEquals("0 kB", format.format(_5_bytes, ScaleUnit.KILOBYTE));

            }
        }
    }

    public String format(long size) {
        return format(size, null);
    }

    public String format(long size, ScaleUnit unit) {
        return format(size, unit, false);
    }

    public String format(long size, ScaleUnit unit, boolean omitSymbol) {
        StringBuilder sb = new StringBuilder();
        format(sb, size, unit, omitSymbol);
        return sb.toString();

			wantFormat.mayBe(FormatUSTAR) // PAX implies USTAR allowed too
		}
		format.mayOnlyBe(wantFormat) // Set union of formats allowed and format wanted
	}
	if format == FormatUnknown {
		switch h.Format {
		case FormatUSTAR:
			err = headerError{"Format specifies USTAR", whyNoUSTAR, whyOnlyPAX, whyOnlyGNU}
		case FormatPAX:
			err = headerError{"Format specifies PAX", whyNoPAX, whyOnlyGNU}
		case FormatGNU:

        final Date date = toDate("10/9/7");
        assertThat(new SimpleDateFormat("yyyy/MM/dd").format(date), is("2010/09/07"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToDate_MediumStyle() throws Exception {
        final Date date = toDate("2010/9/7");
        assertThat(new SimpleDateFormat("yyyy/MM/dd").format(date), is("2010/09/07"));
    }

    /**
     * @throws Exception
     */

        super.warn(format, arg);
        logLevelRecorder.record(Level.WARN);
    }

    /**
     * Perform double parameter substitution before logging the message of level
     * WARN according to the format outlined above.
     */
    @Override
    public void warn(String format, Object arg1, Object arg2) {
        super.warn(format, arg1, arg2);
        logLevelRecorder.record(Level.WARN);
    }

    /**

        final Date date = toDate("11:49");
        assertThat(new SimpleDateFormat("HH:mm:ss").format(date), is("11:49:00"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToDate_MediumStyle() throws Exception {
        final Date date = toDate("11:49:10");
        assertThat(new SimpleDateFormat("HH:mm:ss").format(date), is("11:49:10"));
    }

    /**
     * @throws Exception
     */

        assertThat(new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(date), is("2010/09/07 11:49:00"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToDate_MediumStyle() throws Exception {
        final Date date = toDate("2010/9/7 11:49:10", Locale.JAPAN);
        assertThat(new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(date), is("2010/09/07 11:49:10"));
    }

    /**

  public void testNameFormatWithPercentS_custom() {
    String format = "super-duper-thread-%s";
    ThreadFactory factory = builder.setNameFormat(format).build();
    for (int i = 0; i < 11; i++) {
      assertEquals(rootLocaleFormat(format, i), factory.newThread(monitoredRunnable).getName());
    }
  }

  public void testNameFormatWithPercentD_custom() {
    String format = "super-duper-thread-%d";