strconv: make QuoteRune etc. take a rune argument

Just an oversight it didn't already.
Fixes #2515.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5483064

src/pkg/fmt/format.go

@@ -331,9 +331,9 @@ func (f *fmt) fmt_q(s string) {
 func (f *fmt) fmt_qc(c int64) {
 	var quoted string
 	if f.plus {
-		quoted = strconv.QuoteRuneToASCII(int(c))
+		quoted = strconv.QuoteRuneToASCII(rune(c))
 	} else {
-		quoted = strconv.QuoteRune(int(c))
+		quoted = strconv.QuoteRune(rune(c))
 	}
 	f.padString(quoted)
 }

src/pkg/strconv/quote.go

@@ -116,30 +116,30 @@ func AppendQuoteToASCII(dst []byte, s string) []byte {
 // rune.  The returned string uses Go escape sequences (\t, \n, \xFF, \u0100)
 // for control characters and non-printable characters as defined by
 // unicode.IsPrint.
-func QuoteRune(rune int) string {
+func QuoteRune(r rune) string {
 	// TODO: avoid the allocation here.
-	return quoteWith(string(rune), '\'', false)
+	return quoteWith(string(r), '\'', false)
 }
 
 // AppendQuoteRune appends a single-quoted Go character literal representing the rune,
 // as generated by QuoteRune, to dst and returns the extended buffer.
-func AppendQuoteRune(dst []byte, rune int) []byte {
-	return append(dst, QuoteRune(rune)...)
+func AppendQuoteRune(dst []byte, r rune) []byte {
+	return append(dst, QuoteRune(r)...)
 }
 
 // QuoteRuneToASCII returns a single-quoted Go character literal representing
 // the rune.  The returned string uses Go escape sequences (\t, \n, \xFF,
 // \u0100) for non-ASCII characters and non-printable characters as defined
 // by unicode.IsPrint.
-func QuoteRuneToASCII(rune int) string {
+func QuoteRuneToASCII(r rune) string {
 	// TODO: avoid the allocation here.
-	return quoteWith(string(rune), '\'', true)
+	return quoteWith(string(r), '\'', true)
 }
 
 // AppendQuoteRune appends a single-quoted Go character literal representing the rune,
 // as generated by QuoteRuneToASCII, to dst and returns the extended buffer.
-func AppendQuoteRuneToASCII(dst []byte, rune int) []byte {
-	return append(dst, QuoteRuneToASCII(rune)...)
+func AppendQuoteRuneToASCII(dst []byte, r rune) []byte {
+	return append(dst, QuoteRuneToASCII(r)...)
 }
 
 // CanBackquote returns whether the string s would be

src/pkg/strconv/quote_test.go

@@ -47,7 +47,7 @@ func TestQuoteToASCII(t *testing.T) {
 }
 
 type quoteRuneTest struct {
-	in    int
+	in    rune
 	out   string
 	ascii string
 }