gofmt -r 'α[β:len(α)] -> α[β:]' -w src/cmd src/pkg

R=r, gri
CC=golang-dev
https://golang.org/cl/156115
diff --git a/src/pkg/fmt/print.go b/src/pkg/fmt/print.go
index 15def46..cecdda0 100644
--- a/src/pkg/fmt/print.go
+++ b/src/pkg/fmt/print.go
@@ -603,7 +603,7 @@
 	end := len(format) - 1;
 	fieldnum := 0;	// we process one field per non-trivial format
 	for i := 0; i <= end; {
-		c, w := utf8.DecodeRuneInString(format[i:len(format)]);
+		c, w := utf8.DecodeRuneInString(format[i:]);
 		if c != '%' || i == end {
 			p.add(c);
 			i += w;
@@ -634,7 +634,7 @@
 		if i < end && format[i] == '.' {
 			p.fmt.prec, p.fmt.prec_present, i = parsenum(format, i+1, end)
 		}
-		c, w = utf8.DecodeRuneInString(format[i:len(format)]);
+		c, w = utf8.DecodeRuneInString(format[i:]);
 		i += w;
 		// percent is special - absorbs no operand
 		if c == '%' {