libgo: update to Go1.13

    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/194698

From-SVN: r275691

3 files changed, 16 insertions, 5 deletions

diff --git a/libgo/go/strings/example_test.go b/libgo/go/strings/example_test.go
index 4f3a1ce..375f9ca 100644
--- a/libgo/go/strings/example_test.go
+++ b/libgo/go/strings/example_test.go
@@ -247,14 +247,23 @@ func ExampleSplitAfterN() {
 }
 
 func ExampleTitle() {
+	// Compare this example to the ToTitle example.
 	fmt.Println(strings.Title("her royal highness"))
-	// Output: Her Royal Highness
+	fmt.Println(strings.Title("loud noises"))
+	fmt.Println(strings.Title("хлеб"))
+	// Output:
+	// Her Royal Highness
+	// Loud Noises
+	// Хлеб
 }
 
 func ExampleToTitle() {
+	// Compare this example to the Title example.
+	fmt.Println(strings.ToTitle("her royal highness"))
 	fmt.Println(strings.ToTitle("loud noises"))
 	fmt.Println(strings.ToTitle("хлеб"))
 	// Output:
+	// HER ROYAL HIGHNESS
 	// LOUD NOISES
 	// ХЛЕБ
 }
diff --git a/libgo/go/strings/replace.go b/libgo/go/strings/replace.go
index ccab1fb..e28d428 100644
--- a/libgo/go/strings/replace.go
+++ b/libgo/go/strings/replace.go
@@ -25,7 +25,8 @@ type replacer interface {
 
 // NewReplacer returns a new Replacer from a list of old, new string
 // pairs. Replacements are performed in the order they appear in the
-// target string, without overlapping matches.
+// target string, without overlapping matches. The old string
+// comparisons are done in argument order.
 //
 // NewReplacer panics if given an odd number of arguments.
 func NewReplacer(oldnew ...string) *Replacer {
diff --git a/libgo/go/strings/strings.go b/libgo/go/strings/strings.go
index 7337481..cee315c 100644
--- a/libgo/go/strings/strings.go
+++ b/libgo/go/strings/strings.go
@@ -610,7 +610,8 @@ func ToLower(s string) string {
 	return Map(unicode.ToLower, s)
 }
 
-// ToTitle returns a copy of the string s with all Unicode letters mapped to their title case.
+// ToTitle returns a copy of the string s with all Unicode letters mapped to
+// their Unicode title case.
 func ToTitle(s string) string { return Map(unicode.ToTitle, s) }
 
 // ToUpperSpecial returns a copy of the string s with all Unicode letters mapped to their
@@ -626,7 +627,7 @@ func ToLowerSpecial(c unicode.SpecialCase, s string) string {
 }
 
 // ToTitleSpecial returns a copy of the string s with all Unicode letters mapped to their
-// title case, giving priority to the special casing rules.
+// Unicode title case, giving priority to the special casing rules.
 func ToTitleSpecial(c unicode.SpecialCase, s string) string {
 	return Map(c.ToTitle, s)
 }
@@ -707,7 +708,7 @@ func isSeparator(r rune) bool {
 }
 
 // Title returns a copy of the string s with all Unicode letters that begin words
-// mapped to their title case.
+// mapped to their Unicode title case.
 //
 // BUG(rsc): The rule Title uses for word boundaries does not handle Unicode punctuation properly.
 func Title(s string) string {