parser: check (mut f Foo) syntax

vlib/clipboard/clipboard.v

@@ -6,22 +6,22 @@ pub fn new() &Clipboard {
 }
 
 // copy some text into the clipboard
-pub fn (cb mut Clipboard) copy(text string) bool {
+pub fn (mut cb Clipboard) copy(text string) bool {
 	return cb.set_text(text)
 }
 
 // get the text from the clipboard
-pub fn (cb mut Clipboard) paste() string {
+pub fn (mut cb Clipboard) paste() string {
 	return cb.get_text()
 }
 
 // clear the clipboard
-pub fn (cb mut Clipboard) clear_all() {
+pub fn (mut cb Clipboard) clear_all() {
 	cb.clear()
 }
 
 // destroy the clipboard
-pub fn (cb mut Clipboard) destroy() {
+pub fn (mut cb Clipboard) destroy() {
 	cb.free()
 }