diff --git a/lib/browser.js b/lib/browser.js
index 48b740b7..a9b6c68d 100644
--- a/lib/browser.js
+++ b/lib/browser.js
@@ -19,9 +19,9 @@
       return xhr.send(null);
     };
     processScripts = function() {
-      var _i, _l, _ref, script;
+      var _i, _len, _ref, script;
       _ref = document.getElementsByTagName('script');
-      for (_i = 0, _l = _ref.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
         script = _ref[_i];
         if (script.type === 'text/coffeescript') {
           if (script.src) {
diff --git a/lib/cake.js b/lib/cake.js
index 98ba8258..e9d1aa3e 100755
--- a/lib/cake.js
+++ b/lib/cake.js
@@ -35,7 +35,7 @@
   });
   exports.run = function() {
     return path.exists('Cakefile', function(exists) {
-      var _i, _l, _ref, _result, arg, args;
+      var _i, _len, _ref, _result, arg, args;
       if (!(exists)) {
         throw new Error("Cakefile not found in " + (process.cwd()));
       }
@@ -49,7 +49,7 @@
       }
       options = oparse.parse(args);
       _result = []; _ref = options.arguments;
-      for (_i = 0, _l = _ref.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
         arg = _ref[_i];
         _result.push(invoke(arg));
       }
diff --git a/lib/command.js b/lib/command.js
index ef703325..f81925e0 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -1,16 +1,16 @@
 (function() {
-  var BANNER, CoffeeScript, EventEmitter, SWITCHES, _ref, _ref2, _ref3, compileOptions, compileScript, compileScripts, compileStdio, exec, fs, helpers, lint, optionParser, optparse, opts, parseOptions, path, printTokens, sources, spawn, usage, version, watch, writeJs;
+  var BANNER, CoffeeScript, EventEmitter, SWITCHES, _ref, compileOptions, compileScript, compileScripts, compileStdio, exec, fs, helpers, lint, optionParser, optparse, opts, parseOptions, path, printTokens, sources, spawn, usage, version, watch, writeJs;
   fs = require('fs');
   path = require('path');
   optparse = require('./optparse');
   CoffeeScript = require('./coffee-script');
   _ref = require('./helpers');
   helpers = _ref.helpers;
-  _ref2 = require('child_process');
-  spawn = _ref2.spawn;
-  exec = _ref2.exec;
-  _ref3 = require('events');
-  EventEmitter = _ref3.EventEmitter;
+  _ref = require('child_process');
+  spawn = _ref.spawn;
+  exec = _ref.exec;
+  _ref = require('events');
+  EventEmitter = _ref.EventEmitter;
   helpers.extend(CoffeeScript, new EventEmitter());
   global.CoffeeScript = CoffeeScript;
   BANNER = 'coffee compiles CoffeeScript source files into JavaScript.\n\nUsage:\n  coffee path/to/script.coffee';
@@ -53,12 +53,12 @@
     return compileScripts();
   };
   compileScripts = function() {
-    var _i, _l, _ref4, _result;
-    _result = []; _ref4 = sources;
-    for (_i = 0, _l = _ref4.length; _i < _l; _i++) {
+    var _i, _len, _ref2, _result;
+    _result = []; _ref2 = sources;
+    for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
       (function() {
         var base, compile;
-        var source = _ref4[_i];
+        var source = _ref2[_i];
         return _result.push((function() {
           base = source;
           compile = function(source, topLevel) {
@@ -69,10 +69,10 @@
               return fs.stat(source, function(err, stats) {
                 if (stats.isDirectory()) {
                   return fs.readdir(source, function(err, files) {
-                    var _i2, _l2, _ref5, _result2, file;
-                    _result2 = []; _ref5 = files;
-                    for (_i2 = 0, _l2 = _ref5.length; _i2 < _l2; _i2++) {
-                      file = _ref5[_i2];
+                    var _i2, _len2, _ref3, _result2, file;
+                    _result2 = []; _ref3 = files;
+                    for (_i2 = 0, _len2 = _ref3.length; _i2 < _len2; _i2++) {
+                      file = _ref3[_i2];
                       _result2.push(compile(path.join(source, file)));
                     }
                     return _result2;
@@ -95,13 +95,13 @@
     return _result;
   };
   compileScript = function(file, input, base) {
-    var _i, _l, _ref4, o, options, req, t, task;
+    var _i, _len, _ref2, o, options, req, t, task;
     o = opts;
     options = compileOptions(file);
     if (o.require) {
-      _ref4 = o.require;
-      for (_i = 0, _l = _ref4.length; _i < _l; _i++) {
-        req = _ref4[_i];
+      _ref2 = o.require;
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+        req = _ref2[_i];
         require(helpers.starts(req, '.') ? fs.realpathSync(req) : req);
       }
     }
@@ -204,15 +204,15 @@
     return jsl.stdin.end();
   };
   printTokens = function(tokens) {
-    var _i, _l, _ref4, _ref5, _result, strings, tag, token, value;
+    var _i, _len, _ref2, _ref3, _result, strings, tag, token, value;
     strings = (function() {
-      _result = []; _ref4 = tokens;
-      for (_i = 0, _l = _ref4.length; _i < _l; _i++) {
-        token = _ref4[_i];
+      _result = []; _ref2 = tokens;
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+        token = _ref2[_i];
         _result.push((function() {
-          _ref5 = [token[0], token[1].toString().replace(/\n/, '\\n')];
-          tag = _ref5[0];
-          value = _ref5[1];
+          _ref3 = [token[0], token[1].toString().replace(/\n/, '\\n')];
+          tag = _ref3[0];
+          value = _ref3[1];
           return "[" + (tag) + " " + (value) + "]";
         })());
       }
diff --git a/lib/grammar.js b/lib/grammar.js
index 7a245352..01f367c6 100644
--- a/lib/grammar.js
+++ b/lib/grammar.js
@@ -1,5 +1,5 @@
 (function() {
-  var Parser, _i, _i2, _l, _l2, _ref, _ref2, _ref3, _result, alt, alternatives, grammar, name, o, operators, token, tokens, unwrap;
+  var Parser, _i, _i2, _len, _len2, _ref, _ref2, _ref3, _result, alt, alternatives, grammar, name, o, operators, token, tokens, unwrap;
   var __hasProp = Object.prototype.hasOwnProperty;
   Parser = require('jison').Parser;
   unwrap = /function\s*\(\)\s*\{\s*return\s*([\s\S]*);\s*\}/;
@@ -618,11 +618,11 @@
     alternatives = _ref[name];
     grammar[name] = (function() {
       _result = []; _ref2 = alternatives;
-      for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
         alt = _ref2[_i];
         _result.push((function() {
           _ref3 = alt[0].split(' ');
-          for (_i2 = 0, _l2 = _ref3.length; _i2 < _l2; _i2++) {
+          for (_i2 = 0, _len2 = _ref3.length; _i2 < _len2; _i2++) {
             token = _ref3[_i2];
             if (!(grammar[token])) {
               tokens.push(token);
diff --git a/lib/helpers.js b/lib/helpers.js
index e8ac2ec1..7c7e5baa 100644
--- a/lib/helpers.js
+++ b/lib/helpers.js
@@ -5,12 +5,12 @@
   }
   helpers = (exports.helpers = {});
   helpers.indexOf = (indexOf = function(array, item, from) {
-    var _l, _ref, index, other;
+    var _len, _ref, index, other;
     if (array.indexOf) {
       return array.indexOf(item, from);
     }
     _ref = array;
-    for (index = 0, _l = _ref.length; index < _l; index++) {
+    for (index = 0, _len = _ref.length; index < _len; index++) {
       other = _ref[index];
       if (other === item && (!from || (from <= index))) {
         return index;
@@ -30,9 +30,9 @@
     return string.substring(start, start + literal.length) === literal;
   });
   helpers.compact = (compact = function(array) {
-    var _i, _l, _ref, _result, item;
+    var _i, _len, _ref, _result, item;
     _result = []; _ref = array;
-    for (_i = 0, _l = _ref.length; _i < _l; _i++) {
+    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
       item = _ref[_i];
       if (item) {
         _result.push(item);
@@ -51,7 +51,7 @@
     return num;
   });
   helpers.merge = (merge = function(options, overrides) {
-    var _ref, _ref2, fresh, key, val;
+    var _ref, fresh, key, val;
     fresh = {};
     _ref = options;
     for (key in _ref) {
@@ -59,9 +59,9 @@
       (fresh[key] = val);
     }
     if (overrides) {
-      _ref2 = overrides;
-      for (key in _ref2) {
-        val = _ref2[key];
+      _ref = overrides;
+      for (key in _ref) {
+        val = _ref[key];
         (fresh[key] = val);
       }
     }
@@ -77,10 +77,10 @@
     return _result;
   });
   helpers.flatten = (flatten = function(array) {
-    var _i, _l, _ref, item, memo;
+    var _i, _len, _ref, item, memo;
     memo = [];
     _ref = array;
-    for (_i = 0, _l = _ref.length; _i < _l; _i++) {
+    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
       item = _ref[_i];
       if (item instanceof Array) {
         memo = memo.concat(item);
diff --git a/lib/lexer.js b/lib/lexer.js
index 4609328f..fe42866d 100644
--- a/lib/lexer.js
+++ b/lib/lexer.js
@@ -1,21 +1,21 @@
 (function() {
-  var ASSIGNED, CALLABLE, CODE, COFFEE_ALIASES, COFFEE_KEYWORDS, COMMENT, COMPARE, COMPOUND_ASSIGN, CONVERSIONS, HEREDOC, HEREDOC_INDENT, IDENTIFIER, JS_CLEANER, JS_FORBIDDEN, JS_KEYWORDS, LAST_DENT, LAST_DENTS, LINE_BREAK, LOGIC, Lexer, MATH, MULTILINER, MULTI_DENT, NEXT_CHARACTER, NOT_REGEX, NO_NEWLINE, NUMBER, OPERATOR, REGEX_END, REGEX_ESCAPE, REGEX_INTERPOLATION, REGEX_START, RESERVED, Rewriter, SHIFT, UNARY, WHITESPACE, _ref, _ref2, _ref3, compact, count, helpers, include, starts;
+  var ASSIGNED, CALLABLE, CODE, COFFEE_ALIASES, COFFEE_KEYWORDS, COMMENT, COMPARE, COMPOUND_ASSIGN, CONVERSIONS, HEREDOC, HEREDOC_INDENT, IDENTIFIER, JS_CLEANER, JS_FORBIDDEN, JS_KEYWORDS, LAST_DENT, LAST_DENTS, LINE_BREAK, LOGIC, Lexer, MATH, MULTILINER, MULTI_DENT, NEXT_CHARACTER, NOT_REGEX, NO_NEWLINE, NUMBER, OPERATOR, REGEX_END, REGEX_ESCAPE, REGEX_INTERPOLATION, REGEX_START, RESERVED, Rewriter, SHIFT, UNARY, WHITESPACE, _ref, compact, count, helpers, include, starts;
   var __slice = Array.prototype.slice;
   if (typeof process !== "undefined" && process !== null) {
     _ref = require('./rewriter');
     Rewriter = _ref.Rewriter;
-    _ref2 = require('./helpers');
-    helpers = _ref2.helpers;
+    _ref = require('./helpers');
+    helpers = _ref.helpers;
   } else {
     this.exports = this;
     Rewriter = this.Rewriter;
     helpers = this.helpers;
   }
-  _ref3 = helpers;
-  include = _ref3.include;
-  count = _ref3.count;
-  starts = _ref3.starts;
-  compact = _ref3.compact;
+  _ref = helpers;
+  include = _ref.include;
+  count = _ref.count;
+  starts = _ref.starts;
+  compact = _ref.compact;
   exports.Lexer = (function() {
     Lexer = function() {};
     Lexer.prototype.tokenize = function(code, options) {
@@ -192,11 +192,11 @@
       return true;
     };
     Lexer.prototype.regexToken = function() {
-      var _ref4, end, first, flags, regex, str;
+      var _ref2, end, first, flags, regex, str;
       if (!(first = this.chunk.match(REGEX_START))) {
         return false;
       }
-      if (first[1] === ' ' && !('CALL_START' === (_ref4 = this.tag()) || '=' === _ref4)) {
+      if (first[1] === ' ' && !('CALL_START' === (_ref2 = this.tag()) || '=' === _ref2)) {
         return false;
       }
       if (include(NOT_REGEX, this.tag())) {
@@ -320,7 +320,7 @@
       return true;
     };
     Lexer.prototype.literalToken = function() {
-      var _ref4, match, prev, space, spaced, tag, value;
+      var _ref2, match, prev, space, spaced, tag, value;
       match = this.chunk.match(OPERATOR);
       value = match && match[1];
       space = match && match[2];
@@ -335,7 +335,7 @@
         if (include(JS_FORBIDDEN, this.value())) {
           this.assignmentError();
         }
-        if (('or' === (_ref4 = this.value()) || 'and' === _ref4)) {
+        if (('or' === (_ref2 = this.value()) || 'and' === _ref2)) {
           this.tokens.splice(this.tokens.length - 1, 1, ['COMPOUND_ASSIGN', CONVERSIONS[this.value()] + '=', prev[2]]);
           return true;
         }
@@ -395,14 +395,14 @@
       return accessor ? 'accessor' : false;
     };
     Lexer.prototype.sanitizeHeredoc = function(doc, options) {
-      var _ref4, attempt, indent, match;
+      var _ref2, attempt, indent, match;
       indent = options.indent;
       if (options.herecomment && !include(doc, '\n')) {
         return doc;
       }
       if (!(options.herecomment)) {
         while ((match = HEREDOC_INDENT.exec(doc)) !== null) {
-          attempt = (typeof (_ref4 = match[2]) !== "undefined" && _ref4 !== null) ? match[2] : match[3];
+          attempt = (typeof (_ref2 = match[2]) !== "undefined" && _ref2 !== null) ? match[2] : match[3];
           if (!(typeof indent !== "undefined" && indent !== null) || attempt.length < indent.length) {
             indent = attempt;
           }
@@ -451,7 +451,7 @@
       throw new Error("SyntaxError: Reserved word \"" + (this.value()) + "\" on line " + (this.line + 1) + " can't be assigned");
     };
     Lexer.prototype.balancedString = function(str, delimited, options) {
-      var _i, _l, _ref4, _ref5, close, i, levels, open, pair, slash;
+      var _i, _len, _ref2, _ref3, close, i, levels, open, pair, slash;
       options || (options = {});
       slash = delimited[0][0] === '/';
       levels = [];
@@ -460,12 +460,12 @@
         if (levels.length && starts(str, '\\', i)) {
           i += 1;
         } else {
-          _ref4 = delimited;
-          for (_i = 0, _l = _ref4.length; _i < _l; _i++) {
-            pair = _ref4[_i];
-            _ref5 = pair;
-            open = _ref5[0];
-            close = _ref5[1];
+          _ref2 = delimited;
+          for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+            pair = _ref2[_i];
+            _ref3 = pair;
+            open = _ref3[0];
+            close = _ref3[1];
             if (levels.length && starts(str, close, i) && levels[levels.length - 1] === pair) {
               levels.pop();
               i += close.length - 1;
@@ -494,7 +494,7 @@
       return !i ? false : str.substring(0, i);
     };
     Lexer.prototype.interpolateString = function(str, options) {
-      var _l, _l2, _ref4, _ref5, _ref6, _ref7, escaped, expr, i, idx, inner, interpolated, lexer, nested, pi, quote, tag, tok, token, tokens, value;
+      var _len, _ref2, _ref3, escaped, expr, i, idx, inner, interpolated, lexer, nested, pi, quote, tag, tok, token, tokens, value;
       options || (options = {});
       if (str.length < 3 || !starts(str, '"')) {
         return this.token('STRING', str);
@@ -502,9 +502,9 @@
         lexer = new Lexer();
         tokens = [];
         quote = str.substring(0, 1);
-        _ref4 = [1, 1];
-        i = _ref4[0];
-        pi = _ref4[1];
+        _ref2 = [1, 1];
+        i = _ref2[0];
+        pi = _ref2[1];
         while (i < str.length - 1) {
           if (starts(str, '\\', i)) {
             i += 1;
@@ -520,9 +520,9 @@
               nested = lexer.tokenize("(" + (inner) + ")", {
                 line: this.line
               });
-              _ref5 = nested;
-              for (idx = 0, _l = _ref5.length; idx < _l; idx++) {
-                tok = _ref5[idx];
+              _ref2 = nested;
+              for (idx = 0, _len = _ref2.length; idx < _len; idx++) {
+                tok = _ref2[idx];
                 if (tok[0] === 'CALL_END') {
                   (tok[0] = ')');
                 }
@@ -547,12 +547,12 @@
         if (interpolated) {
           this.token('(', '(');
         }
-        _ref6 = tokens;
-        for (i = 0, _l2 = _ref6.length; i < _l2; i++) {
-          token = _ref6[i];
-          _ref7 = token;
-          tag = _ref7[0];
-          value = _ref7[1];
+        _ref2 = tokens;
+        for (i = 0, _len = _ref2.length; i < _len; i++) {
+          token = _ref2[i];
+          _ref3 = token;
+          tag = _ref3[0];
+          value = _ref3[1];
           if (tag === 'TOKENS') {
             this.tokens = this.tokens.concat(value);
           } else if (tag === 'STRING' && options.escapeQuotes) {
diff --git a/lib/nodes.js b/lib/nodes.js
index 67779681..896ade10 100644
--- a/lib/nodes.js
+++ b/lib/nodes.js
@@ -31,7 +31,7 @@
       return this;
     };
     BaseNode.prototype.compile = function(o) {
-      var closure, top;
+      var closure, code, top;
       this.options = merge(o || {});
       this.tab = o.indent;
       if (!(this instanceof AccessorNode || this instanceof IndexNode)) {
@@ -39,7 +39,14 @@
       }
       top = this.topSensitive() ? this.options.top : del(this.options, 'top');
       closure = this.isStatement(o) && !this.isPureStatement() && !top && !this.options.asStatement && !(this instanceof CommentNode) && !this.containsPureStatement();
-      return closure ? this.compileClosure(this.options) : this.compileNode(this.options);
+      if (!o.keepLevel) {
+        o.scope.startLevel();
+      }
+      code = closure ? this.compileClosure(this.options) : this.compileNode(this.options);
+      if (!o.keepLevel) {
+        o.scope.endLevel();
+      }
+      return code;
     };
     BaseNode.prototype.compileClosure = function(o) {
       this.tab = o.indent;
@@ -102,11 +109,11 @@
       return this.traverseChildren(true, block);
     };
     BaseNode.prototype.toString = function(idt, override) {
-      var _i, _l, _ref2, _result, child, children;
+      var _i, _len, _ref2, _result, child, children;
       idt || (idt = '');
       children = (function() {
         _result = []; _ref2 = this.collectChildren();
-        for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
           child = _ref2[_i];
           _result.push(child.toString(idt + TAB));
         }
@@ -115,16 +122,16 @@
       return '\n' + idt + (override || this["class"]) + children;
     };
     BaseNode.prototype.eachChild = function(func) {
-      var _i, _i2, _l, _l2, _ref2, _ref3, _result, attr, child;
+      var _i, _i2, _len, _len2, _ref2, _ref3, _result, attr, child;
       if (!(this.children)) {
         return null;
       }
       _result = []; _ref2 = this.children;
-      for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
         attr = _ref2[_i];
         if (this[attr]) {
           _ref3 = flatten([this[attr]]);
-          for (_i2 = 0, _l2 = _ref3.length; _i2 < _l2; _i2++) {
+          for (_i2 = 0, _len2 = _ref3.length; _i2 < _len2; _i2++) {
             child = _ref3[_i2];
             if (func(child) === false) {
               return null;
@@ -210,10 +217,10 @@
       return o.scope ? Expressions.__super__.compile.call(this, o) : this.compileRoot(o);
     };
     Expressions.prototype.compileNode = function(o) {
-      var _i, _l, _ref2, _result, node;
+      var _i, _len, _ref2, _result, node;
       return (function() {
         _result = []; _ref2 = this.expressions;
-        for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
           node = _ref2[_i];
           _result.push(this.compileExpression(node, merge(o)));
         }
@@ -355,25 +362,25 @@
       return this.base instanceof LiteralNode && this.base.value.match(NUMBER);
     };
     ValueNode.prototype.cacheIndexes = function(o) {
-      var _i, _l, _ref2, _ref3, copy, i;
+      var _i, _len, _ref2, copy, i;
       copy = new ValueNode(this.base, this.properties.slice(0));
       if (this.base instanceof CallNode) {
         _ref2 = this.base.compileReference(o);
         this.base = _ref2[0];
         copy.base = _ref2[1];
       }
-      _ref3 = copy.properties;
-      for (_i = 0, _l = _ref3.length; _i < _l; _i++) {
+      _ref2 = copy.properties;
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
         (function() {
-          var _ref4, index, indexVar;
+          var _ref3, index, indexVar;
           var i = _i;
-          var prop = _ref3[_i];
+          var prop = _ref2[_i];
           if (prop instanceof IndexNode && prop.contains(function(n) {
             return n instanceof CallNode;
           })) {
-            _ref4 = prop.index.compileReference(o);
-            index = _ref4[0];
-            indexVar = _ref4[1];
+            _ref3 = prop.index.compileReference(o);
+            index = _ref3[0];
+            indexVar = _ref3[1];
             this.properties[i] = new IndexNode(index);
             return (copy.properties[i] = new IndexNode(indexVar));
           }
@@ -385,22 +392,22 @@
       return !o.top || this.properties.length ? ValueNode.__super__.compile.call(this, o) : this.base.compile(o);
     };
     ValueNode.prototype.compileNode = function(o) {
-      var _i, _l, _l2, _ref2, _ref3, _ref4, baseline, complete, copy, hasSoak, i, me, only, op, part, prop, props, temp;
+      var _i, _len, _ref2, baseline, complete, copy, hasSoak, i, me, only, op, part, prop, props, temp;
       only = del(o, 'onlyFirst');
       op = this.tags.operation;
       props = only ? this.properties.slice(0, this.properties.length - 1) : this.properties;
       o.chainRoot || (o.chainRoot = this);
       _ref2 = props;
-      for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
         prop = _ref2[_i];
         if (prop.soakNode) {
           hasSoak = true;
         }
       }
       if (hasSoak && this.containsType(CallNode)) {
-        _ref3 = this.cacheIndexes(o);
-        me = _ref3[0];
-        copy = _ref3[1];
+        _ref2 = this.cacheIndexes(o);
+        me = _ref2[0];
+        copy = _ref2[1];
       }
       if (this.parenthetical && !props.length) {
         this.base.parenthetical = true;
@@ -410,9 +417,9 @@
         baseline = ("(" + (baseline) + ")");
       }
       complete = (this.last = baseline);
-      _ref4 = props;
-      for (i = 0, _l2 = _ref4.length; i < _l2; i++) {
-        prop = _ref4[i];
+      _ref2 = props;
+      for (i = 0, _len = _ref2.length; i < _len; i++) {
+        prop = _ref2[i];
         this.source = baseline;
         if (prop.soakNode) {
           if (this.base.containsType(CallNode) && i === 0) {
@@ -497,7 +504,7 @@
       })());
     };
     CallNode.prototype.compileNode = function(o) {
-      var _i, _i2, _l, _l2, _ref2, _ref3, _ref4, _ref5, _result, arg, args, code, first, meth, methodAccessor, op;
+      var _i, _len, _ref2, _result, arg, args, code, first, meth, methodAccessor, op;
       if (!(o.chainRoot)) {
         o.chainRoot = this;
       }
@@ -511,29 +518,29 @@
           this.first = new ValueNode(first, [methodAccessor]).compile(o);
           this.meth = new ValueNode(meth, [methodAccessor]).compile(o);
         } else {
-          _ref3 = this.variable.compileReference(o, {
+          _ref2 = this.variable.compileReference(o, {
             precompile: true
           });
-          this.first = _ref3[0];
-          this.meth = _ref3[1];
+          this.first = _ref2[0];
+          this.meth = _ref2[1];
         }
         this.first = ("(typeof " + (this.first) + " === \"function\" ? ");
         this.last = " : undefined)";
       } else if (this.variable) {
         this.meth = this.variable.compile(o);
       }
-      _ref4 = this.args;
-      for (_i = 0, _l = _ref4.length; _i < _l; _i++) {
-        arg = _ref4[_i];
+      _ref2 = this.args;
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+        arg = _ref2[_i];
         if (arg instanceof SplatNode) {
           code = this.compileSplat(o);
         }
       }
       if (!code) {
         args = (function() {
-          _result = []; _ref5 = this.args;
-          for (_i2 = 0, _l2 = _ref5.length; _i2 < _l2; _i2++) {
-            arg = _ref5[_i2];
+          _result = []; _ref2 = this.args;
+          for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+            arg = _ref2[_i];
             _result.push((function() {
               arg.parenthetical = true;
               return arg.compile(o);
@@ -549,7 +556,7 @@
       return "" + (this.superReference(o)) + ".call(this" + (args.length ? ', ' : '') + (args) + ")";
     };
     CallNode.prototype.compileSplat = function(o) {
-      var _i, _l, _ref2, a, b, c, mentionsArgs, meth, obj, temp;
+      var _i, _len, _ref2, a, b, c, mentionsArgs, meth, obj, temp;
       meth = this.meth || this.superReference(o);
       obj = this.variable && this.variable.source || 'this';
       if (obj.match(/\(/)) {
@@ -560,7 +567,7 @@
       if (this.isNew) {
         mentionsArgs = false;
         _ref2 = this.args;
-        for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
           (function() {
             var arg = _ref2[_i];
             return arg.contains(function(n) {
@@ -570,7 +577,7 @@
         }
         utility('extends');
         a = o.scope.freeVariable('ctor');
-        b = o.scope.freeVariable('instance');
+        b = o.scope.freeVariable('ref');
         c = o.scope.freeVariable('result');
         return "" + (this.first) + "(function() {\n" + (this.idt(1)) + "var ctor = function(){};\n" + (this.idt(1)) + "__extends(ctor, " + (a) + " = " + (meth) + ");\n" + (this.idt(1)) + "return typeof (" + (c) + " = " + (a) + ".apply(" + (b) + " = new ctor, " + (this.compileSplatArguments(o)) + ")) === \"object\" ? " + (c) + " : " + (b) + ";\n" + (this.tab) + "})." + (mentionsArgs ? 'apply(this, arguments)' : 'call(this)') + (this.last);
       } else {
@@ -647,7 +654,7 @@
     RangeNode.prototype["class"] = 'RangeNode';
     RangeNode.prototype.children = ['from', 'to'];
     RangeNode.prototype.compileVariables = function(o) {
-      var _ref2, _ref3, _ref4, parts;
+      var _ref2, parts;
       o = merge(o, {
         top: true
       });
@@ -656,14 +663,14 @@
       });
       this.from = _ref2[0];
       this.fromVar = _ref2[1];
-      _ref3 = this.to.compileReference(o, {
+      _ref2 = this.to.compileReference(o, {
         precompile: true
       });
-      this.to = _ref3[0];
-      this.toVar = _ref3[1];
-      _ref4 = [this.fromVar.match(SIMPLENUM), this.toVar.match(SIMPLENUM)];
-      this.fromNum = _ref4[0];
-      this.toNum = _ref4[1];
+      this.to = _ref2[0];
+      this.toVar = _ref2[1];
+      _ref2 = [this.fromVar.match(SIMPLENUM), this.toVar.match(SIMPLENUM)];
+      this.fromNum = _ref2[0];
+      this.toNum = _ref2[1];
       parts = [];
       if (this.from !== this.fromVar) {
         parts.push(this.from);
@@ -766,12 +773,12 @@
       return true;
     };
     ObjectNode.prototype.compileNode = function(o) {
-      var _i, _l, _l2, _ref2, _ref3, _result, _result2, i, indent, join, lastNoncom, nonComments, obj, prop, props, top;
+      var _i, _len, _ref2, _result, i, indent, join, lastNoncom, nonComments, obj, prop, props, top;
       top = del(o, 'top');
       o.indent = this.idt(1);
       nonComments = (function() {
         _result = []; _ref2 = this.properties;
-        for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
           prop = _ref2[_i];
           if (!(prop instanceof CommentNode)) {
             _result.push(prop);
@@ -781,10 +788,10 @@
       }).call(this);
       lastNoncom = nonComments[nonComments.length - 1];
       props = (function() {
-        _result2 = []; _ref3 = this.properties;
-        for (i = 0, _l2 = _ref3.length; i < _l2; i++) {
-          prop = _ref3[i];
-          _result2.push((function() {
+        _result = []; _ref2 = this.properties;
+        for (i = 0, _len = _ref2.length; i < _len; i++) {
+          prop = _ref2[i];
+          _result.push((function() {
             join = ",\n";
             if ((prop === lastNoncom) || (prop instanceof CommentNode)) {
               join = "\n";
@@ -799,7 +806,7 @@
             return indent + prop.compile(o) + join;
           }).call(this));
         }
-        return _result2;
+        return _result;
       }).call(this);
       props = props.join('');
       obj = '{' + (props ? '\n' + props + '\n' + this.idt() : '') + '}';
@@ -821,11 +828,11 @@
     ArrayNode.prototype["class"] = 'ArrayNode';
     ArrayNode.prototype.children = ['objects'];
     ArrayNode.prototype.compileNode = function(o) {
-      var _l, _ref2, code, i, obj, objects;
+      var _len, _ref2, code, i, obj, objects;
       o.indent = this.idt(1);
       objects = [];
       _ref2 = this.objects;
-      for (i = 0, _l = _ref2.length; i < _l; i++) {
+      for (i = 0, _len = _ref2.length; i < _len; i++) {
         obj = _ref2[i];
         code = obj.compile(o);
         if (obj instanceof SplatNode) {
@@ -864,7 +871,7 @@
       return this;
     };
     ClassNode.prototype.compileNode = function(o) {
-      var _i, _l, _ref2, _ref3, access, applied, className, constScope, construct, constructor, extension, func, me, pname, prop, props, pvar, returns, val;
+      var _i, _len, _ref2, _ref3, access, applied, className, constScope, construct, constructor, extension, func, me, pname, prop, props, pvar, returns, val;
       if (this.variable === '__temp__') {
         this.variable = literal(o.scope.freeVariable('ctor'));
       }
@@ -881,7 +888,7 @@
         constructor = new CodeNode();
       }
       _ref2 = this.properties;
-      for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
         prop = _ref2[_i];
         _ref3 = [prop.variable, prop.value];
         pvar = _ref3[0];
@@ -996,7 +1003,7 @@
       return top || this.parenthetical ? val : ("(" + (val) + ")");
     };
     AssignNode.prototype.compilePatternMatch = function(o) {
-      var _l, _ref2, _ref3, accessClass, assigns, code, i, idx, isString, obj, oindex, olength, splat, val, valVar, value;
+      var _len, _ref2, _ref3, accessClass, assigns, code, i, idx, isString, obj, oindex, olength, splat, val, valVar, value;
       valVar = o.scope.freeVariable('ref');
       value = this.value.isStatement(o) ? ClosureNode.wrap(this.value) : this.value;
       assigns = [("" + (this.tab) + (valVar) + " = " + (value.compile(o)) + ";")];
@@ -1004,7 +1011,7 @@
       o.asStatement = true;
       splat = false;
       _ref2 = this.variable.base.objects;
-      for (i = 0, _l = _ref2.length; i < _l; i++) {
+      for (i = 0, _len = _ref2.length; i < _len; i++) {
         obj = _ref2[i];
         idx = i;
         if (this.variable.isObject()) {
@@ -1067,7 +1074,7 @@
     CodeNode.prototype["class"] = 'CodeNode';
     CodeNode.prototype.children = ['params', 'body'];
     CodeNode.prototype.compileNode = function(o) {
-      var _i, _i2, _l, _l2, _l3, _ref2, _ref3, _ref4, _ref5, _ref6, _result, code, empty, func, i, param, params, sharedScope, splat, top, value;
+      var _i, _len, _ref2, _ref3, _result, code, empty, func, i, param, params, sharedScope, splat, top, value;
       sharedScope = del(o, 'sharedScope');
       top = del(o, 'top');
       o.scope = sharedScope || new Scope(o.scope, this.body, this);
@@ -1079,7 +1086,7 @@
       splat = undefined;
       params = [];
       _ref2 = this.params;
-      for (i = 0, _l = _ref2.length; i < _l; i++) {
+      for (i = 0, _len = _ref2.length; i < _len; i++) {
         param = _ref2[i];
         if (splat) {
           if (param.attach) {
@@ -1091,9 +1098,9 @@
           if (param.attach) {
             _ref3 = param;
             value = _ref3.value;
-            _ref4 = [literal(o.scope.freeVariable('arg')), param.splat];
-            param = _ref4[0];
-            param.splat = _ref4[1];
+            _ref3 = [literal(o.scope.freeVariable('arg')), param.splat];
+            param = _ref3[0];
+            param.splat = _ref3[1];
             this.body.unshift(new AssignNode(new ValueNode(literal('this'), [new AccessorNode(value)]), param));
           }
           if (param.splat) {
@@ -1108,9 +1115,9 @@
         }
       }
       params = (function() {
-        _result = []; _ref5 = params;
-        for (_i = 0, _l2 = _ref5.length; _i < _l2; _i++) {
-          param = _ref5[_i];
+        _result = []; _ref2 = params;
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+          param = _ref2[_i];
           _result.push(param.compile(o));
         }
         return _result;
@@ -1118,9 +1125,9 @@
       if (!(empty)) {
         this.body.makeReturn();
       }
-      _ref6 = params;
-      for (_i2 = 0, _l3 = _ref6.length; _i2 < _l3; _i2++) {
-        param = _ref6[_i2];
+      _ref2 = params;
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+        param = _ref2[_i];
         (o.scope.parameter(param));
       }
       code = this.body.expressions.length ? ("\n" + (this.body.compileWithDeclarations(o)) + "\n") : '';
@@ -1139,11 +1146,11 @@
       }
     };
     CodeNode.prototype.toString = function(idt) {
-      var _i, _l, _ref2, _result, child, children;
+      var _i, _len, _ref2, _result, child, children;
       idt || (idt = '');
       children = (function() {
         _result = []; _ref2 = this.collectChildren();
-        for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
           child = _ref2[_i];
           _result.push(child.toString(idt + TAB));
         }
@@ -1190,18 +1197,18 @@
       return (typeof (_ref2 = this.index) !== "undefined" && _ref2 !== null) ? this.compileParam(o) : this.name.compile(o);
     };
     SplatNode.prototype.compileParam = function(o) {
-      var _l, _ref2, assign, end, idx, len, name, pos, trailing, variadic;
+      var _len, _ref2, assign, end, idx, len, name, pos, trailing, variadic;
       name = this.name.compile(o);
       o.scope.find(name);
       end = '';
       if (this.trailings.length) {
-        len = o.scope.freeVariable('ref');
+        len = o.scope.freeVariable('len');
         o.scope.assign(len, "arguments.length");
         variadic = o.scope.freeVariable('result');
         o.scope.assign(variadic, len + ' >= ' + this.arglength);
         end = this.trailings.length ? (", " + (len) + " - " + (this.trailings.length)) : null;
         _ref2 = this.trailings;
-        for (idx = 0, _l = _ref2.length; idx < _l; idx++) {
+        for (idx = 0, _len = _ref2.length; idx < _len; idx++) {
           trailing = _ref2[idx];
           if (trailing.attach) {
             assign = trailing.assign;
@@ -1220,10 +1227,10 @@
       return "" + (utility('slice')) + ".call(" + (name) + ", " + (index) + (trail) + ")";
     };
     SplatNode.compileSplattedArray = function(list, o) {
-      var _l, _ref2, arg, args, code, i, last, prev;
+      var _len, _ref2, arg, args, code, i, last, prev;
       args = [];
       _ref2 = list;
-      for (i = 0, _l = _ref2.length; i < _l; i++) {
+      for (i = 0, _len = _ref2.length; i < _len; i++) {
         arg = _ref2[i];
         code = arg.compile(o);
         prev = args[(last = args.length - 1)];
@@ -1377,17 +1384,17 @@
       return [this.first.compile(o), this.operator, this.second.compile(o)].join(' ');
     };
     OpNode.prototype.compileChain = function(o) {
-      var _ref2, _ref3, first, second, shared;
+      var _ref2, first, second, shared;
       shared = this.first.unwrap().second;
       if (shared.containsType(CallNode)) {
         _ref2 = shared.compileReference(o);
         this.first.second = _ref2[0];
         shared = _ref2[1];
       }
-      _ref3 = [this.first.compile(o), this.second.compile(o), shared.compile(o)];
-      first = _ref3[0];
-      second = _ref3[1];
-      shared = _ref3[2];
+      _ref2 = [this.first.compile(o), this.second.compile(o), shared.compile(o)];
+      first = _ref2[0];
+      second = _ref2[1];
+      shared = _ref2[2];
       return "(" + (first) + ") && (" + (shared) + " " + (this.operator) + " " + (second) + ")";
     };
     OpNode.prototype.compileAssignment = function(o) {
@@ -1451,10 +1458,10 @@
       return this.isArray() ? this.compileOrTest(o) : this.compileLoopTest(o);
     };
     InNode.prototype.compileOrTest = function(o) {
-      var _l, _ref2, _result, i, item, tests;
+      var _len, _ref2, _result, i, item, tests;
       tests = (function() {
         _result = []; _ref2 = this.array.base.objects;
-        for (i = 0, _l = _ref2.length; i < _l; i++) {
+        for (i = 0, _len = _ref2.length; i < _len; i++) {
           item = _ref2[i];
           _result.push("" + (item.compile(o)) + " === " + (i ? this.obj2 : this.obj1));
         }
@@ -1463,15 +1470,15 @@
       return "(" + (tests.join(' || ')) + ")";
     };
     InNode.prototype.compileLoopTest = function(o) {
-      var _ref2, _ref3, i, l, prefix;
+      var _ref2, i, l, prefix;
       _ref2 = this.array.compileReference(o, {
         precompile: true
       });
       this.arr1 = _ref2[0];
       this.arr2 = _ref2[1];
-      _ref3 = [o.scope.freeVariable('i'), o.scope.freeVariable('l')];
-      i = _ref3[0];
-      l = _ref3[1];
+      _ref2 = [o.scope.freeVariable('i'), o.scope.freeVariable('len')];
+      i = _ref2[0];
+      l = _ref2[1];
       prefix = this.obj1 !== this.obj2 ? this.obj1 + '; ' : '';
       return "(function(){ " + (prefix) + "for (var " + (i) + "=0, " + (l) + "=" + (this.arr1) + ".length; " + (i) + "<" + (l) + "; " + (i) + "++) { if (" + (this.arr2) + "[" + (i) + "] === " + (this.obj2) + ") return true; } return false; }).call(this)";
     };
@@ -1686,7 +1693,8 @@
         if (this.pattern) {
           namePart = new AssignNode(this.name, literal("" + (svar) + "[" + (ivar) + "]")).compile(merge(o, {
             indent: this.idt(1),
-            top: true
+            top: true,
+            keepLevel: true
           })) + '\n';
         } else {
           if (name) {
@@ -1694,7 +1702,7 @@
           }
         }
         if (!(this.object)) {
-          lvar = scope.freeVariable('l');
+          lvar = scope.freeVariable('len');
           stepPart = this.step ? ("" + (ivar) + " += " + (this.step.compile(o))) : ("" + (ivar) + "++");
           forPart = ("" + (ivar) + " = 0, " + (lvar) + " = " + (svar) + ".length; " + (ivar) + " < " + (lvar) + "; " + (stepPart));
         }
@@ -1754,9 +1762,9 @@
       return true;
     };
     SwitchNode.prototype.makeReturn = function() {
-      var _i, _l, _ref2, pair;
+      var _i, _len, _ref2, pair;
       _ref2 = this.cases;
-      for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
         pair = _ref2[_i];
         pair[1].makeReturn();
       }
@@ -1766,20 +1774,20 @@
       return this;
     };
     SwitchNode.prototype.compileNode = function(o) {
-      var _i, _i2, _l, _l2, _ref2, _ref3, _ref4, block, code, condition, conditions, exprs, idt, pair;
+      var _i, _i2, _len, _len2, _ref2, _ref3, block, code, condition, conditions, exprs, idt, pair;
       idt = (o.indent = this.idt(1));
       o.top = true;
       code = ("" + (this.tab) + "switch (" + (this.subject.compile(o)) + ") {");
       _ref2 = this.cases;
-      for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
         pair = _ref2[_i];
         _ref3 = pair;
         conditions = _ref3[0];
         block = _ref3[1];
         exprs = block.expressions;
-        _ref4 = flatten([conditions]);
-        for (_i2 = 0, _l2 = _ref4.length; _i2 < _l2; _i2++) {
-          condition = _ref4[_i2];
+        _ref3 = flatten([conditions]);
+        for (_i2 = 0, _len2 = _ref3.length; _i2 < _len2; _i2++) {
+          condition = _ref3[_i2];
           if (this.tags.subjectless) {
             condition = new OpNode('!!', new ParentheticalNode(condition));
           }
@@ -1844,14 +1852,14 @@
       return this.statement || (this.statement = (!!((o && o.top) || this.tags.statement || this.bodyNode().isStatement(o) || (this.elseBody && this.elseBodyNode().isStatement(o)))));
     };
     IfNode.prototype.compileCondition = function(o) {
-      var _i, _l, _ref2, _result, cond, conditions;
+      var _i, _len, _ref2, _result, cond, conditions;
       conditions = flatten([this.condition]);
       if (conditions.length === 1) {
         conditions[0].parenthetical = true;
       }
       return (function() {
         _result = []; _ref2 = conditions;
-        for (_i = 0, _l = _ref2.length; _i < _l; _i++) {
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
           cond = _ref2[_i];
           _result.push(cond.compile(o));
         }
diff --git a/lib/optparse.js b/lib/optparse.js
index 565a9bd3..5b63a8ad 100755
--- a/lib/optparse.js
+++ b/lib/optparse.js
@@ -7,18 +7,18 @@
       return this;
     };
     OptionParser.prototype.parse = function(args) {
-      var _i, _l, _l2, _ref, _ref2, arg, i, isOption, matchedRule, options, rule, value;
+      var _i, _len, _len2, _ref, _ref2, arg, i, isOption, matchedRule, options, rule, value;
       options = {
         arguments: []
       };
       args = normalizeArguments(args);
       _ref = args;
-      for (i = 0, _l = _ref.length; i < _l; i++) {
+      for (i = 0, _len = _ref.length; i < _len; i++) {
         arg = _ref[i];
         isOption = !!(arg.match(LONG_FLAG) || arg.match(SHORT_FLAG));
         matchedRule = false;
         _ref2 = this.rules;
-        for (_i = 0, _l2 = _ref2.length; _i < _l2; _i++) {
+        for (_i = 0, _len2 = _ref2.length; _i < _len2; _i++) {
           rule = _ref2[_i];
           if (rule.shortFlag === arg || rule.longFlag === arg) {
             value = rule.hasArgument ? args[i += 1] : true;
@@ -38,13 +38,13 @@
       return options;
     };
     OptionParser.prototype.help = function() {
-      var _i, _l, _ref, _result, i, letPart, lines, rule, spaces;
+      var _i, _len, _ref, _result, i, letPart, lines, rule, spaces;
       lines = ['Available options:'];
       if (this.banner) {
         lines.unshift("" + (this.banner) + "\n");
       }
       _ref = this.rules;
-      for (_i = 0, _l = _ref.length; _i < _l; _i++) {
+      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
         rule = _ref[_i];
         spaces = 15 - rule.longFlag.length;
         spaces = spaces > 0 ? (function() {
@@ -66,9 +66,9 @@
   MULTI_FLAG = /^-(\w{2,})/;
   OPTIONAL = /\[(\w+(\*?))\]/;
   buildRules = function(rules) {
-    var _i, _l, _ref, _result, tuple;
+    var _i, _len, _ref, _result, tuple;
     _result = []; _ref = rules;
-    for (_i = 0, _l = _ref.length; _i < _l; _i++) {
+    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
       tuple = _ref[_i];
       _result.push((function() {
         if (tuple.length < 3) {
@@ -94,15 +94,15 @@
     };
   };
   normalizeArguments = function(args) {
-    var _i, _i2, _l, _l2, _ref, _ref2, arg, l, match, result;
+    var _i, _i2, _len, _len2, _ref, _ref2, arg, l, match, result;
     args = args.slice(0);
     result = [];
     _ref = args;
-    for (_i = 0, _l = _ref.length; _i < _l; _i++) {
+    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
       arg = _ref[_i];
       if (match = arg.match(MULTI_FLAG)) {
         _ref2 = match[1].split('');
-        for (_i2 = 0, _l2 = _ref2.length; _i2 < _l2; _i2++) {
+        for (_i2 = 0, _len2 = _ref2.length; _i2 < _len2; _i2++) {
           l = _ref2[_i2];
           result.push('-' + l);
         }
diff --git a/lib/rewriter.js b/lib/rewriter.js
index 2b884a5d..8d6e0a0a 100644
--- a/lib/rewriter.js
+++ b/lib/rewriter.js
@@ -1,5 +1,5 @@
 (function() {
-  var BALANCED_PAIRS, EXPRESSION_CLOSE, EXPRESSION_END, EXPRESSION_START, IMPLICIT_BLOCK, IMPLICIT_CALL, IMPLICIT_END, IMPLICIT_FUNC, INVERSES, LINEBREAKS, Rewriter, SINGLE_CLOSERS, SINGLE_LINERS, _i, _i2, _i3, _l, _l2, _l3, _ref, _ref2, _ref3, _ref4, _ref5, _result, _result2, helpers, include, pair;
+  var BALANCED_PAIRS, EXPRESSION_CLOSE, EXPRESSION_END, EXPRESSION_START, IMPLICIT_BLOCK, IMPLICIT_CALL, IMPLICIT_END, IMPLICIT_FUNC, INVERSES, LINEBREAKS, Rewriter, SINGLE_CLOSERS, SINGLE_LINERS, _i, _len, _ref, _result, helpers, include, pair;
   var __hasProp = Object.prototype.hasOwnProperty;
   if (typeof process !== "undefined" && process !== null) {
     _ref = require('./helpers');
@@ -8,8 +8,8 @@
     this.exports = this;
     helpers = this.helpers;
   }
-  _ref2 = helpers;
-  include = _ref2.include;
+  _ref = helpers;
+  include = _ref.include;
   exports.Rewriter = (function() {
     Rewriter = function() {};
     Rewriter.prototype.rewrite = function(tokens) {
@@ -62,15 +62,15 @@
     };
     Rewriter.prototype.adjustComments = function() {
       return this.scanTokens(function(token, i) {
-        var _ref3, _ref4, after, before, post, prev;
+        var _ref2, after, before, post, prev;
         if (token[0] !== 'HERECOMMENT') {
           return 1;
         }
-        _ref3 = [this.tokens[i - 2], this.tokens[i - 1], this.tokens[i + 1], this.tokens[i + 2]];
-        before = _ref3[0];
-        prev = _ref3[1];
-        post = _ref3[2];
-        after = _ref3[3];
+        _ref2 = [this.tokens[i - 2], this.tokens[i - 1], this.tokens[i + 1], this.tokens[i + 2]];
+        before = _ref2[0];
+        prev = _ref2[1];
+        post = _ref2[2];
+        after = _ref2[3];
         if (after && after[0] === 'INDENT') {
           this.tokens.splice(i + 2, 1);
           if (before && before[0] === 'OUTDENT' && post && (prev[0] === post[0]) && (post[0] === 'TERMINATOR')) {
@@ -78,7 +78,7 @@
           } else {
             this.tokens.splice(i, 0, after);
           }
-        } else if (prev && !('TERMINATOR' === (_ref4 = prev[0]) || 'INDENT' === _ref4 || 'OUTDENT' === _ref4)) {
+        } else if (prev && !('TERMINATOR' === (_ref2 = prev[0]) || 'INDENT' === _ref2 || 'OUTDENT' === _ref2)) {
           if (post && post[0] === 'TERMINATOR' && after && after[0] === 'OUTDENT') {
             this.tokens.splice.apply(this.tokens, [i + 2, 0].concat(this.tokens.splice(i, 2)));
             if (this.tokens[i + 2][0] !== 'TERMINATOR') {
@@ -114,8 +114,8 @@
         var action, condition;
         if (token[0] === 'CALL_START') {
           condition = function(token, i) {
-            var _ref3;
-            return ((')' === (_ref3 = token[0]) || 'CALL_END' === _ref3)) || (token[0] === 'OUTDENT' && this.tokens[i - 1][0] === ')');
+            var _ref2;
+            return ((')' === (_ref2 = token[0]) || 'CALL_END' === _ref2)) || (token[0] === 'OUTDENT' && this.tokens[i - 1][0] === ')');
           };
           action = function(token, i) {
             var idx;
@@ -132,8 +132,8 @@
         var action, condition;
         if (token[0] === 'INDEX_START') {
           condition = function(token, i) {
-            var _ref3;
-            return (']' === (_ref3 = token[0]) || 'INDEX_END' === _ref3);
+            var _ref2;
+            return (']' === (_ref2 = token[0]) || 'INDEX_END' === _ref2);
           };
           action = function(token, i) {
             return (token[0] = 'INDEX_END');
@@ -162,15 +162,15 @@
           tok.generated = true;
           this.tokens.splice(idx, 0, tok);
           condition = function(token, i) {
-            var _ref3, _ref4, _ref5, one, three, two;
-            _ref3 = this.tokens.slice(i + 1, i + 4);
-            one = _ref3[0];
-            two = _ref3[1];
-            three = _ref3[2];
+            var _ref2, one, three, two;
+            _ref2 = this.tokens.slice(i + 1, i + 4);
+            one = _ref2[0];
+            two = _ref2[1];
+            three = _ref2[2];
             if ((this.tag(i + 1) === 'HERECOMMENT' || this.tag(i - 1) === 'HERECOMMENT')) {
               return false;
             }
-            return ((('TERMINATOR' === (_ref4 = token[0]) || 'OUTDENT' === _ref4)) && !((two && two[0] === ':') || (one && one[0] === '@' && three && three[0] === ':'))) || (token[0] === ',' && one && (!('IDENTIFIER' === (_ref5 = one[0]) || 'STRING' === _ref5 || '@' === _ref5 || 'TERMINATOR' === _ref5 || 'OUTDENT' === _ref5)));
+            return ((('TERMINATOR' === (_ref2 = token[0]) || 'OUTDENT' === _ref2)) && !((two && two[0] === ':') || (one && one[0] === '@' && three && three[0] === ':'))) || (token[0] === ',' && one && (!('IDENTIFIER' === (_ref2 = one[0]) || 'STRING' === _ref2 || '@' === _ref2 || 'TERMINATOR' === _ref2 || 'OUTDENT' === _ref2)));
           };
           action = function(token, i) {
             return this.tokens.splice(i, 0, ['}', '}', token[2]]);
@@ -185,7 +185,7 @@
       var classLine;
       classLine = false;
       return this.scanTokens(function(token, i) {
-        var _ref3, action, callObject, condition, idx, next, prev, seenSingle;
+        var _ref2, action, callObject, condition, idx, next, prev, seenSingle;
         if (token[0] === 'CLASS') {
           classLine = true;
         }
@@ -203,14 +203,14 @@
         if (prev && !prev.spaced && token[0] === '?') {
           token.call = true;
         }
-        if (prev && (prev.spaced && (include(IMPLICIT_FUNC, prev[0]) || prev.call) && include(IMPLICIT_CALL, token[0]) && !(token[0] === 'UNARY' && (('IN' === (_ref3 = this.tag(i + 1)) || 'OF' === _ref3 || 'INSTANCEOF' === _ref3)))) || callObject) {
+        if (prev && (prev.spaced && (include(IMPLICIT_FUNC, prev[0]) || prev.call) && include(IMPLICIT_CALL, token[0]) && !(token[0] === 'UNARY' && (('IN' === (_ref2 = this.tag(i + 1)) || 'OF' === _ref2 || 'INSTANCEOF' === _ref2)))) || callObject) {
           this.tokens.splice(i, 0, ['CALL_START', '(', token[2]]);
           condition = function(token, i) {
-            var _ref3, post;
+            var _ref2, post;
             if (!seenSingle && token.fromThen) {
               return true;
             }
-            if (('IF' === (_ref3 = token[0]) || 'ELSE' === _ref3 || 'UNLESS' === _ref3 || '->' === _ref3 || '=>' === _ref3)) {
+            if (('IF' === (_ref2 = token[0]) || 'ELSE' === _ref2 || 'UNLESS' === _ref2 || '->' === _ref2 || '=>' === _ref2)) {
               seenSingle = true;
             }
             post = this.tokens[i + 1];
@@ -231,7 +231,7 @@
     };
     Rewriter.prototype.addImplicitIndentation = function() {
       return this.scanTokens(function(token, i) {
-        var _ref3, action, condition, indent, outdent, starter;
+        var _ref2, action, condition, indent, outdent, starter;
         if (token[0] === 'ELSE' && this.tag(i - 1) !== 'OUTDENT') {
           this.tokens.splice.apply(this.tokens, [i, 0].concat(this.indentation(token)));
           return 2;
@@ -242,9 +242,9 @@
         }
         if (include(SINGLE_LINERS, token[0]) && this.tag(i + 1) !== 'INDENT' && !(token[0] === 'ELSE' && this.tag(i + 1) === 'IF')) {
           starter = token[0];
-          _ref3 = this.indentation(token);
-          indent = _ref3[0];
-          outdent = _ref3[1];
+          _ref2 = this.indentation(token);
+          indent = _ref2[0];
+          outdent = _ref2[1];
           if (starter === 'THEN') {
             indent.fromThen = true;
           }
@@ -269,12 +269,12 @@
     };
     Rewriter.prototype.tagPostfixConditionals = function() {
       return this.scanTokens(function(token, i) {
-        var _ref3, action, condition, original;
-        if (('IF' === (_ref3 = token[0]) || 'UNLESS' === _ref3)) {
+        var _ref2, action, condition, original;
+        if (('IF' === (_ref2 = token[0]) || 'UNLESS' === _ref2)) {
           original = token;
           condition = function(token, i) {
-            var _ref3;
-            return ('TERMINATOR' === (_ref3 = token[0]) || 'INDENT' === _ref3);
+            var _ref2;
+            return ('TERMINATOR' === (_ref2 = token[0]) || 'INDENT' === _ref2);
           };
           action = function(token, i) {
             if (token[0] !== 'INDENT') {
@@ -288,17 +288,17 @@
       });
     };
     Rewriter.prototype.ensureBalance = function(pairs) {
-      var _ref3, _result, key, levels, line, open, openLine, unclosed, value;
+      var _ref2, _result, key, levels, line, open, openLine, unclosed, value;
       levels = {};
       openLine = {};
       this.scanTokens(function(token, i) {
-        var _i, _l, _ref3, _ref4, close, open, pair;
-        _ref3 = pairs;
-        for (_i = 0, _l = _ref3.length; _i < _l; _i++) {
-          pair = _ref3[_i];
-          _ref4 = pair;
-          open = _ref4[0];
-          close = _ref4[1];
+        var _i, _len, _ref2, _ref3, close, open, pair;
+        _ref2 = pairs;
+        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+          pair = _ref2[_i];
+          _ref3 = pair;
+          open = _ref3[0];
+          close = _ref3[1];
           levels[open] || (levels[open] = 0);
           if (token[0] === open) {
             if (levels[open] === 0) {
@@ -316,10 +316,10 @@
         return 1;
       });
       unclosed = (function() {
-        _result = []; _ref3 = levels;
-        for (key in _ref3) {
-          if (!__hasProp.call(_ref3, key)) continue;
-          value = _ref3[key];
+        _result = []; _ref2 = levels;
+        for (key in _ref2) {
+          if (!__hasProp.call(_ref2, key)) continue;
+          value = _ref2[key];
           if (value > 0) {
             _result.push(key);
           }
@@ -333,13 +333,13 @@
       }
     };
     Rewriter.prototype.rewriteClosingParens = function() {
-      var _ref3, debt, key, stack, val;
+      var _ref2, debt, key, stack, val;
       stack = [];
       debt = {};
-      _ref3 = INVERSES;
-      for (key in _ref3) {
-        if (!__hasProp.call(_ref3, key)) continue;
-        val = _ref3[key];
+      _ref2 = INVERSES;
+      for (key in _ref2) {
+        if (!__hasProp.call(_ref2, key)) continue;
+        val = _ref2[key];
         (debt[key] = 0);
       }
       return this.scanTokens(function(token, i) {
@@ -386,27 +386,27 @@
   })();
   BALANCED_PAIRS = [['(', ')'], ['[', ']'], ['{', '}'], ['INDENT', 'OUTDENT'], ['PARAM_START', 'PARAM_END'], ['CALL_START', 'CALL_END'], ['INDEX_START', 'INDEX_END']];
   INVERSES = {};
-  _ref3 = BALANCED_PAIRS;
-  for (_i = 0, _l = _ref3.length; _i < _l; _i++) {
-    pair = _ref3[_i];
+  _ref = BALANCED_PAIRS;
+  for (_i = 0, _len = _ref.length; _i < _len; _i++) {
+    pair = _ref[_i];
     INVERSES[pair[0]] = pair[1];
     INVERSES[pair[1]] = pair[0];
   }
   EXPRESSION_START = (function() {
-    _result = []; _ref4 = BALANCED_PAIRS;
-    for (_i2 = 0, _l2 = _ref4.length; _i2 < _l2; _i2++) {
-      pair = _ref4[_i2];
+    _result = []; _ref = BALANCED_PAIRS;
+    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
+      pair = _ref[_i];
       _result.push(pair[0]);
     }
     return _result;
   })();
   EXPRESSION_END = (function() {
-    _result2 = []; _ref5 = BALANCED_PAIRS;
-    for (_i3 = 0, _l3 = _ref5.length; _i3 < _l3; _i3++) {
-      pair = _ref5[_i3];
-      _result2.push(pair[1]);
+    _result = []; _ref = BALANCED_PAIRS;
+    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
+      pair = _ref[_i];
+      _result.push(pair[1]);
     }
-    return _result2;
+    return _result;
   })();
   EXPRESSION_CLOSE = ['CATCH', 'WHEN', 'ELSE', 'FINALLY'].concat(EXPRESSION_END);
   IMPLICIT_FUNC = ['IDENTIFIER', 'SUPER', ')', 'CALL_END', ']', 'INDEX_END', '@', 'THIS'];
diff --git a/lib/scope.js b/lib/scope.js
index 7d43fd24..6719df37 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -16,15 +16,29 @@
       this.expressions = _ref2[1];
       this.method = _ref2[2];
       this.variables = {};
-      this.generated = {};
       if (this.parent) {
-        extend(this.generated, this.parent.generated);
+        this.garbage = this.parent.garbage;
       } else {
+        this.garbage = [];
         Scope.root = this;
       }
       return this;
     };
     Scope.root = null;
+    Scope.prototype.startLevel = function() {
+      return this.garbage.push([]);
+    };
+    Scope.prototype.endLevel = function() {
+      var _i, _len, _ref2, _result, name;
+      _result = []; _ref2 = this.garbage.pop();
+      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
+        name = _ref2[_i];
+        if (this.variables[name] === 'var') {
+          _result.push(this.variables[name] = 'reuse');
+        }
+      }
+      return _result;
+    };
     Scope.prototype.find = function(name, options) {
       if (this.check(name, options)) {
         return true;
@@ -59,12 +73,15 @@
       return '_' + type + (index > 1 ? index : '');
     };
     Scope.prototype.freeVariable = function(type) {
-      var temp;
-      this.generated[type] || (this.generated[type] = 1);
-      while (this.check(temp = this.temporary(type, this.generated[type]))) {
-        this.generated[type]++;
+      var index, temp;
+      index = 0;
+      while (this.check(temp = this.temporary(type, index)) && this.variables[temp] !== 'reuse') {
+        index++;
       }
       this.variables[temp] = 'var';
+      if (this.garbage.length) {
+        this.garbage[this.garbage.length - 1].push(temp);
+      }
       return temp;
     };
     Scope.prototype.assign = function(name, value) {
@@ -75,7 +92,7 @@
     };
     Scope.prototype.hasDeclarations = function(body) {
       return body === this.expressions && this.any(function(k, val) {
-        return val === 'var';
+        return val === 'var' || val === 'reuse';
       });
     };
     Scope.prototype.hasAssignments = function(body) {
@@ -90,7 +107,7 @@
         for (key in _ref2) {
           if (!__hasProp.call(_ref2, key)) continue;
           val = _ref2[key];
-          if (val === 'var') {
+          if (val === 'var' || val === 'reuse') {
             _result.push(key);
           }
         }
diff --git a/src/nodes.coffee b/src/nodes.coffee
index 712b591c..075ced69 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -50,7 +50,10 @@ exports.BaseNode = class BaseNode
     closure = @isStatement(o) and not @isPureStatement() and not top and
               not @options.asStatement and this not instanceof CommentNode and
               not @containsPureStatement()
-    if closure then @compileClosure(@options) else @compileNode(@options)
+    o.scope.startLevel() if not o.keepLevel
+    code = if closure then @compileClosure(@options) else @compileNode(@options)
+    o.scope.endLevel() if not o.keepLevel
+    code
 
   # Statements converted into expressions via closure-wrapping share a scope
   # object with their parent closure, to preserve the expected lexical scope.
@@ -497,7 +500,7 @@ exports.CallNode = class CallNode extends BaseNode
         arg.contains (n) -> mentionsArgs or= n instanceof LiteralNode and (n.value is 'arguments')
       utility 'extends'
       a = o.scope.freeVariable 'ctor'
-      b = o.scope.freeVariable 'instance'
+      b = o.scope.freeVariable 'ref'
       c = o.scope.freeVariable 'result'
       """
       #{@first}(function() {
@@ -1011,7 +1014,7 @@ exports.SplatNode = class SplatNode extends BaseNode
     o.scope.find name
     end = ''
     if @trailings.length
-      len = o.scope.freeVariable 'ref'
+      len = o.scope.freeVariable 'len'
       o.scope.assign len, "arguments.length"
       variadic = o.scope.freeVariable 'result'
       o.scope.assign variadic, len + ' >= ' + @arglength
@@ -1227,7 +1230,7 @@ exports.InNode = class InNode extends BaseNode
 
   compileLoopTest: (o) ->
     [@arr1, @arr2] = @array.compileReference o, precompile: yes
-    [i, l] = [o.scope.freeVariable('i'), o.scope.freeVariable('l')]
+    [i, l] = [o.scope.freeVariable('i'), o.scope.freeVariable('len')]
     prefix = if @obj1 isnt @obj2 then @obj1 + '; ' else ''
     "(function(){ #{prefix}for (var #{i}=0, #{l}=#{@arr1}.length; #{i}<#{l}; #{i}++) { if (#{@arr2}[#{i}] === #{@obj2}) return true; } return false; }).call(this)"
 
@@ -1401,11 +1404,11 @@ exports.ForNode = class ForNode extends BaseNode
       svar        = scope.freeVariable 'ref'
       sourcePart  = "#{svar} = #{ @source.compile(o) };"
       if @pattern
-        namePart  = new AssignNode(@name, literal("#{svar}[#{ivar}]")).compile(merge o, {indent: @idt(1), top: true}) + '\n'
+        namePart  = new AssignNode(@name, literal("#{svar}[#{ivar}]")).compile(merge o, {indent: @idt(1), top: true, keepLevel: yes}) + '\n'
       else
         namePart  = "#{name} = #{svar}[#{ivar}]" if name
       unless @object
-        lvar      = scope.freeVariable 'l'
+        lvar      = scope.freeVariable 'len'
         stepPart  = if @step then "#{ivar} += #{ @step.compile(o) }" else "#{ivar}++"
         forPart   = "#{ivar} = 0, #{lvar} = #{svar}.length; #{ivar} < #{lvar}; #{stepPart}"
     sourcePart    = (if rvar then "#{rvar} = []; " else '') + sourcePart
diff --git a/src/scope.coffee b/src/scope.coffee
index 961e34fa..bf0d4071 100644
--- a/src/scope.coffee
+++ b/src/scope.coffee
@@ -26,12 +26,21 @@ exports.Scope = class Scope
   constructor: (parent, expressions, method) ->
     [@parent, @expressions, @method] = [parent, expressions, method]
     @variables = {}
-    @generated = {}
     if @parent
-      extend @generated, @parent.generated
+      @garbage = @parent.garbage
     else
+      @garbage   = []
       Scope.root = this
 
+  # Create a new garbage level
+  startLevel: ->
+    @garbage.push []
+
+  # Return to the previous garbage level and erase referenced temporary
+  # variables in current level from scope.
+  endLevel: ->
+    (@variables[name] = 'reuse') for name in @garbage.pop() when @variables[name] is 'var'
+
   # Look up a variable name in lexical scope, and declare it if it does not
   # already exist.
   find: (name, options) ->
@@ -64,9 +73,10 @@ exports.Scope = class Scope
   # If we need to store an intermediate result, find an available name for a
   # compiler-generated variable. `_var`, `_var2`, and so on...
   freeVariable: (type) ->
-    @generated[type] or= 1
-    @generated[type]++ while @check temp = @temporary type, @generated[type]
+    index = 0
+    index++ while @check(temp = @temporary type, index) and @variables[temp] isnt 'reuse'
     @variables[temp] = 'var'
+    @garbage[@garbage.length - 1].push temp if @garbage.length
     temp
 
   # Ensure that an assignment is made at the top of this scope
@@ -77,7 +87,7 @@ exports.Scope = class Scope
   # Does this scope reference any variables that need to be declared in the
   # given function body?
   hasDeclarations: (body) ->
-    body is @expressions and @any (k, val) -> val is 'var'
+    body is @expressions and @any (k, val) -> val is 'var' or val is 'reuse'
 
   # Does this scope reference any assignments that need to be declared at the
   # top of the given function body?
@@ -86,7 +96,7 @@ exports.Scope = class Scope
 
   # Return the list of variables first declared in this scope.
   declaredVariables: ->
-    (key for key, val of @variables when val is 'var').sort()
+    (key for key, val of @variables when val is 'var' or val is 'reuse').sort()
 
   # Return the list of assignments that are supposed to be made at the top
   # of this scope.