Fix #1437. Unneeded ref in existential assignment.

lib/coffee-script/browser.js

@@ -10,11 +10,10 @@
   compile = CoffeeScript.compile;
 
   CoffeeScript["eval"] = function(code, options) {
-    var _ref;
     if (options == null) {
       options = {};
     }
-    if ((_ref = options.bare) == null) {
+    if (options.bare == null) {
       options.bare = true;
     }
     return eval(compile(code, options));

lib/coffee-script/coffee-script.js

@@ -85,12 +85,12 @@
   };
 
   exports.run = function(code, options) {
-    var answer, mainModule, _ref;
+    var answer, mainModule;
     if (options == null) {
       options = {};
     }
     mainModule = require.main;
-    if ((_ref = options.sourceMap) == null) {
+    if (options.sourceMap == null) {
       options.sourceMap = true;
     }
     mainModule.filename = process.argv[1] = options.filename ? fs.realpathSync(options.filename) : '.';

lib/coffee-script/helpers.js

@@ -187,11 +187,11 @@
   };
 
   exports.throwSyntaxError = function(message, location) {
-    var error, _ref1, _ref2;
-    if ((_ref1 = location.last_line) == null) {
+    var error;
+    if (location.last_line == null) {
       location.last_line = location.first_line;
     }
-    if ((_ref2 = location.last_column) == null) {
+    if (location.last_column == null) {
       location.last_column = location.first_column;
     }
     error = new SyntaxError(message);

lib/coffee-script/nodes.js

@@ -776,17 +776,16 @@
     };
 
     Value.prototype.unfoldSoak = function(o) {
-      var _ref4,
-        _this = this;
-      return (_ref4 = this.unfoldedSoak) != null ? _ref4 : this.unfoldedSoak = (function() {
-        var fst, i, ifn, prop, ref, snd, _i, _len, _ref5, _ref6;
+      var _this = this;
+      return this.unfoldedSoak != null ? this.unfoldedSoak : this.unfoldedSoak = (function() {
+        var fst, i, ifn, prop, ref, snd, _i, _len, _ref4, _ref5;
         if (ifn = _this.base.unfoldSoak(o)) {
-          (_ref5 = ifn.body.properties).push.apply(_ref5, _this.properties);
+          (_ref4 = ifn.body.properties).push.apply(_ref4, _this.properties);
           return ifn;
         }
-        _ref6 = _this.properties;
-        for (i = _i = 0, _len = _ref6.length; _i < _len; i = ++_i) {
-          prop = _ref6[i];
+        _ref5 = _this.properties;
+        for (i = _i = 0, _len = _ref5.length; _i < _len; i = ++_i) {
+          prop = _ref5[i];
           if (!prop.soak) {
             continue;
           }
@@ -2309,7 +2308,7 @@
 
     Op.prototype.compileExistence = function(o) {
       var fst, ref;
-      if (this.first.isComplex()) {
+      if (!o.isExistentialEquals && this.first.isComplex()) {
         ref = new Literal(o.scope.freeVariable('ref'));
         fst = new Parens(new Assign(ref, this.first));
       } else {

src/nodes.coffee

@@ -1641,8 +1641,9 @@ exports.Op = class Op extends Base
       (shared.compileToFragments o), @makeCode(" #{@operator} "), (@second.compileToFragments o, LEVEL_OP)
     @wrapInBraces fragments
 
+  # Keep reference to the left expression, unless this an existential assignment
   compileExistence: (o) ->
-    if @first.isComplex()
+    if !o.isExistentialEquals and @first.isComplex()
       ref = new Literal o.scope.freeVariable 'ref'
       fst = new Parens new Assign ref, @first
     else