Deal with the fallout of string stabilization

src/libregex/compile.rs

@@ -105,7 +105,7 @@ impl Program {
         let mut pre = String::with_capacity(5);
         for inst in c.insts.slice_from(1).iter() {
             match *inst {
-                OneChar(c, FLAG_EMPTY) => pre.push_char(c),
+                OneChar(c, FLAG_EMPTY) => pre.push(c),
                 _ => break
             }
         }

src/libregex/re.rs

@@ -26,9 +26,9 @@ pub fn quote(text: &str) -> String {
     let mut quoted = String::with_capacity(text.len());
     for c in text.chars() {
         if parse::is_punct(c) {
-            quoted.push_char('\\')
+            quoted.push('\\')
         }
-        quoted.push_char(c);
+        quoted.push(c);
     }
     quoted
 }
@@ -504,7 +504,8 @@ impl Regex {
             new.push_str(rep.reg_replace(&cap).as_slice());
             last_match = e;
         }
-        new.append(text.slice(last_match, text.len()))
+        new.push_str(text.slice(last_match, text.len()));
+        return new;
     }
 
     /// Returns the original string of this regex.