assertEquals("yoho", is('a').replaceFrom("yaha", 'o'));
    assertEquals("yh", is('a').replaceFrom("yaha", ""));
    assertEquals("yoho", is('a').replaceFrom("yaha", "o"));
    assertEquals("yoohoo", is('a').replaceFrom("yaha", "oo"));
    assertEquals("12 > 5", is('>').replaceFrom("12 > 5", ">"));
  }

  public void testRetainFrom() {
    assertEquals("aaa", is('a').retainFrom("bazaar"));

    assertEquals("yoho", is('a').replaceFrom("yaha", 'o'));
    assertEquals("yh", is('a').replaceFrom("yaha", ""));
    assertEquals("yoho", is('a').replaceFrom("yaha", "o"));
    assertEquals("yoohoo", is('a').replaceFrom("yaha", "oo"));
    assertEquals("12 > 5", is('>').replaceFrom("12 > 5", ">"));
  }

  public void testRetainFrom() {
    assertEquals("aaa", is('a').retainFrom("bazaar"));

A74D          ; valid                                  # 5.1  LATIN SMALL LETTER O WITH LOOP
A74E          ; mapped                 ; A74F          # 5.1  LATIN CAPITAL LETTER OO
A74F          ; valid                                  # 5.1  LATIN SMALL LETTER OO
A750          ; mapped                 ; A751          # 5.1  LATIN CAPITAL LETTER P WITH STROKE THROUGH DESCENDER

   * Returns a string copy of the input character sequence, with each matching BMP character
   * replaced by a given replacement sequence. For example:
   *
   * <pre>{@code
   * CharMatcher.is('a').replaceFrom("yaha", "oo")
   * }</pre>
   *
   * ... returns {@code "yoohoo"}.
   *
   * <p><b>Note:</b> If the replacement is a fixed string with only one character, you are better

ro?lenap:.nomead,,oc?saak,t&en?ikcats,???i&a?v??k!.&gro?lim?moc?su,ten?ude?vog???m!.&drp?gro?lim?m&o&c?n??t??oc?ude?vog??pk??n!.&dtl,eman?gro?hcs?i!bom??l&im?oc,?m&oc!.topsgolb,?rif,?neg,ogn,ten?ude?vog??aw?i!b!mulp??car?d&art?dew??h&sif?tolc??k&iv?oo&b?c???ls?n&aelc?iart??p!pohs??re&enigne?tac??t&ad?ekram?hgil?lusnoc?neg?ov?soh!.tfarcnepo,??vi&g?l???o!.lbo,s??u&rehcisrev?smas?tarebsnegömrev???o&d?lb?og!.&duolc,etalsnart,???r&2n084qlj--nx?ebmoolb?o!.&77ndc.c:sr,,a&remacytirucesym,t&neimip,sivret...

ro?lenap:.nomead,,oc?saak,t&en?ikcats,???i&a?v??k!.&gro?lim?moc?su,ten?ude?vog???m!.&drp?gro?lim?m&o&c?n??t??oc?ude?vog??pk??n!.&dtl,eman?gro?hcs?i!bom??l&im?oc,?m&oc!.topsgolb,?rif,?neg,ogn,ten?ude?vog??aw?i!b!mulp??car?d&art?dew??h&sif?tolc??k&iv?oo&b?c???ls?n&aelc?iart??p!pohs??re&enigne?tac??t&ad?ekram?hgil?lusnoc?neg?ov?soh!.tfarcnepo,??vi&g?l???o!.lbo,s??u&rehcisrev?smas?tarebsnegömrev???o&d?lb?og!.&duolc,etalsnart,???r&2n084qlj--nx?ebmoolb?o!.&77ndc.c:sr,,a&remacytirucesym,t&neimip,sivret...

	{"", "a", -1},
	{"x", "a", -1},
	{"x", "x", 0},
	{"abc", "a", 0},
	{"abc", "b", 1},
	{"abc", "c", 2},
	{"abc", "x", -1},
	{"barfoobarfooyyyzzzyyyzzzyyyzzzyyyxxxzzzyyy", "x", 33},
	{"fofofofooofoboo", "oo", 7},
	{"fofofofofofoboo", "ob", 11},
	{"fofofofofofoboo", "boo", 12},
	{"fofofofofofoboo", "oboo", 11},
	{"fofofofofoooboo", "fooo", 8},
	{"fofofofofofoboo", "foboo", 10},
	{"fofofofofofoboo", "fofob", 8},

// The results of the following examples are given for 32-bit ints,
// which means the shifts will overflow.
var mm int = 1.0<<s            // 1.0 has type int; mm == 0
var oo = 1<<s == 2<<s          // 1 and 2 have type int; oo == true
var pp = 1<<s == 1<<33         // illegal: 1 has type int, but 1<<33 overflows int
var xx = a[1.0<<s]             // 1.0 has type int; xx == a[0]

// The results of the following examples are given for 32-bit ints,
// which means the shifts will overflow.
var mm int = 1.0<<s            // 1.0 has type int; mm == 0
var oo = 1<<s == 2<<s          // 1 and 2 have type int; oo == true
var pp = 1<<s == 1<<33         // illegal: 1 has type int, but 1<<33 overflows int
var xx = a[1.0<<s]             // 1.0 has type int; xx == a[0]

-Seal-Algorithm":"DAREv2-HMAC-SHA256","content-type":"application/octet-stream"}},{"Bucket":"buck1","Name":"go_113/src/cmd/go/testdata/src/coverdep/p.go","UserDef":{"X-Minio-Internal-Server-Side-Encryption-Iv":"3xrAMJgYz3goP4p4waBe+bptEec6+MeSyNv1W+Oo=","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id":"my-minio-key","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key":"IAAfANSBOEDdNGCJq6bp/yAva50SSl7tpTm8Y15Uu/BGKkHFKHTMuNkURQcb3H==","X-Minio-Internal-Server-Side-Encryption-S3-Seal...