Support break and cont in pretty-printer

Author: marijnh

src/comp/front/parser.rs

@@ -1683,6 +1683,8 @@ fn stmt_ends_with_semi(@ast.stmt stmt) -> bool {
                 case (ast.expr_index(_,_,_))    { ret true; }
                 case (ast.expr_path(_,_,_))     { ret true; }
                 case (ast.expr_fail)            { ret true; }
+                case (ast.expr_break)           { ret true; }
+                case (ast.expr_cont)            { ret true; }
                 case (ast.expr_ret(_))          { ret true; }
                 case (ast.expr_put(_))          { ret true; }
                 case (ast.expr_be(_))           { ret true; }

src/comp/pretty/pprust.rs

@@ -553,6 +553,12 @@ impure fn print_expr(ps s, &@ast.expr expr) {
         case (ast.expr_fail) {
             wrd(s.s, "fail");
         }
+        case (ast.expr_break) {
+            wrd(s.s, "break");
+        }
+        case (ast.expr_cont) {
+            wrd(s.s, "cont");
+        }
         case (ast.expr_ret(?result)) {
             wrd(s.s, "ret");
             alt (result) {