Fixing #773. Statements cannot be wrapped in parens (as in JS).

lib/grammar.js

@@ -362,7 +362,7 @@
       })
     ],
     Parenthetical: [
-      o("( Line )", function() {
+      o("( Expression )", function() {
         return new Parens($2);
       }), o("( )", function() {
         return new Parens(new Literal(''));

src/grammar.coffee

@@ -404,7 +404,7 @@ grammar =
   # where only values are accepted, wrapping it in parentheses will always do
   # the trick.
   Parenthetical: [
-    o "( Line )",                               -> new Parens $2
+    o "( Expression )",                         -> new Parens $2
     o "( )",                                    -> new Parens new Literal ''
   ]
 

test/test_try_catch.coffee

@@ -1,5 +1,5 @@
 # Basic exception throwing.
-block = -> (throw 'up')
+block = -> throw 'up'
 throws block, 'up'