From 354708dbc22b0fa29a5e9b3514135816deca8f50 Mon Sep 17 00:00:00 2001
From: Jeremy Ashkenas <jashkenas@gmail.com>
Date: Sat, 13 Nov 2010 12:17:09 -0500
Subject: [PATCH] Putting 'constructor' back. Improving constructor
 definitions.

---
 lib/grammar.js                  |   2 +-
 lib/nodes.js                    |  66 ++++++++++++---------
 lib/parser.js                   |   2 +-
 lib/rewriter.js                 |   6 +-
 src/grammar.coffee              |   2 +-
 src/nodes.coffee                | 102 ++++++++++++++++++--------------
 src/optparse.coffee             |   2 +-
 src/rewriter.coffee             |   4 +-
 src/scope.coffee                |   2 +-
 test/test_arguments.coffee      |   2 +-
 test/test_classes.coffee        |  24 ++++----
 test/test_comprehensions.coffee |   2 +-
 test/test_existence.coffee      |   2 +-
 13 files changed, 120 insertions(+), 98 deletions(-)

diff --git a/lib/grammar.js b/lib/grammar.js
index d94bfdf7..2a004a4c 100644
--- a/lib/grammar.js
+++ b/lib/grammar.js
@@ -185,7 +185,7 @@
     ],
     Object: [
       o('{ AssignList OptComma }', function() {
-        return new Obj($2);
+        return new Obj($2, $1.generated);
       })
     ],
     AssignList: [
diff --git a/lib/nodes.js b/lib/nodes.js
index 594ef8f4..f23bfdc5 100644
--- a/lib/nodes.js
+++ b/lib/nodes.js
@@ -369,9 +369,6 @@
     Value.prototype.isArray = function() {
       return !this.properties.length && this.base instanceof Arr;
     };
-    Value.prototype.isObject = function() {
-      return !this.properties.length && this.base instanceof Obj;
-    };
     Value.prototype.isComplex = function() {
       return this.hasProperties() || this.base.isComplex();
     };
@@ -398,6 +395,12 @@
     Value.prototype.assigns = function(name) {
       return !this.properties.length && this.base.assigns(name);
     };
+    Value.prototype.isObject = function(onlyGenerated) {
+      if (this.properties.length) {
+        return false;
+      }
+      return (this.base instanceof Obj) && (!onlyGenerated || this.base.generated);
+    };
     Value.prototype.makeReturn = function() {
       if (this.properties.length) {
         return Value.__super__.makeReturn.call(this);
@@ -664,7 +667,8 @@
     return Index;
   }();
   exports.Obj = Obj = function() {
-    function Obj(props) {
+    function Obj(props, _arg) {
+      this.generated = _arg != null ? _arg : false;
       this.objects = this.properties = props || [];
     }
     __extends(Obj, Base);
@@ -821,6 +825,7 @@
     Class.prototype.children = ['variable', 'parent', 'body'];
     Class.prototype.compileNode = function(o) {
       var bname, boundFuncs, bvar, convert, ctor, decl, exps, i, klass, lname, name, node, others, tail, _fn, _i, _j, _len, _len2, _len3, _ref, _ref2;
+      ctor = null;
       if (this.variable) {
         decl = (tail = last(this.variable.properties)) ? tail instanceof Accessor && tail.name.value : this.variable.base.value;
         decl && (decl = IDENTIFIER.test(decl) && decl);
@@ -838,19 +843,33 @@
         }
       });
       convert = function(node) {
-        var assign, base, func, _i, _len, _ref, _results;
-        _ref = node.base.properties;
+        var assign, base, func, props, _results;
+        props = node.base.properties.slice(0);
         _results = [];
-        for (_i = 0, _len = _ref.length; _i < _len; _i++) {
-          assign = _ref[_i];
+        while (assign = props.shift()) {
           if (assign instanceof Assign) {
             base = assign.variable.base;
-            assign.variable = new Value(lname, [new Accessor(base, 'proto')]);
             delete assign.context;
             func = assign.value;
-            if (func instanceof Code && func.bound) {
-              boundFuncs.push(base);
-              func.bound = false;
+            if (base.value === 'constructor') {
+              if (ctor) {
+                throw new Error('cannot define more than one constructor in a class');
+              }
+              if (func.bound) {
+                throw new Error('cannot define a constructor as a bound function');
+              }
+              if (func instanceof Code) {
+                ctor = func;
+              } else {
+                ctor = new Assign(new Value(lname), func);
+              }
+              assign = null;
+            } else {
+              assign.variable = new Value(lname, [new Accessor(base, 'proto')]);
+              if (func instanceof Code && func.bound) {
+                boundFuncs.push(base);
+                func.bound = false;
+              }
             }
           }
           _results.push(assign);
@@ -862,18 +881,8 @@
       _ref = exps = this.body.expressions;
       for (i = 0, _len = _ref.length; i < _len; i++) {
         node = _ref[i];
-        if (node instanceof Value && node.isObject()) {
-          exps[i] = convert(node);
-        } else if (node instanceof Code) {
-          if (ctor) {
-            throw new Error('cannot define more than one constructor in a class');
-          }
-          if (node.bound) {
-            throw new Error('cannot define a constructor as a bound function');
-          }
-          ctor = node;
-          exps.splice(i, 1);
-          exps.unshift(ctor);
+        if (node instanceof Value && node.isObject(true)) {
+          exps[i] = compact(convert(node));
         } else {
           others.push(node);
         }
@@ -885,8 +894,8 @@
             _ref = n2.expressions;
             for (j = 0, _len = _ref.length; j < _len; j++) {
               expr2 = _ref[j];
-              if (expr2 instanceof Value && expr2.isObject()) {
-                n2.expressions[j] = convert(expr2);
+              if (expr2 instanceof Value && expr2.isObject(true)) {
+                n2.expressions[j] = compact(convert(expr2));
               }
             }
             return n2.expressions = flatten(n2.expressions);
@@ -899,7 +908,7 @@
       }
       this.body.expressions = exps = flatten(exps);
       if (!ctor) {
-        exps.unshift(ctor = new Code);
+        ctor = new Code;
         if (this.parent) {
           ctor.body.push(new Call('super', [new Splat(new Literal('arguments'))]));
         }
@@ -908,8 +917,9 @@
       ctor.klass = null;
       ctor.noReturn = true;
       if (this.parent) {
-        exps.splice(1, 0, new Extends(lname, this.parent));
+        exps.unshift(new Extends(lname, this.parent));
       }
+      exps.unshift(ctor);
       exps.push(lname);
       if (boundFuncs.length) {
         for (_j = 0, _len3 = boundFuncs.length; _j < _len3; _j++) {
diff --git a/lib/parser.js b/lib/parser.js
index 42437bd6..cef31e6d 100755
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -181,7 +181,7 @@ case 84:this.$ = yy.extend($$[$0-2+2-1], {
           proto: true
         });
 break;
-case 85:this.$ = new yy.Obj($$[$0-4+2-1]);
+case 85:this.$ = new yy.Obj($$[$0-4+2-1], $$[$0-4+1-1].generated);
 break;
 case 86:this.$ = [];
 break;
diff --git a/lib/rewriter.js b/lib/rewriter.js
index c056d339..52e82aea 100644
--- a/lib/rewriter.js
+++ b/lib/rewriter.js
@@ -122,7 +122,7 @@
         return this.tokens.splice(i, 0, ['}', '}', token[2]]);
       };
       return this.scanTokens(function(token, i, tokens) {
-        var ago1, ago2, idx, tag, tok, _ref, _ref2;
+        var ago1, ago2, idx, tag, tok, value, _ref, _ref2;
         if (_ref = (tag = token[0]), __indexOf.call(EXPRESSION_START, _ref) >= 0) {
           stack.push([(tag === 'INDENT' && this.tag(i - 1) === '{' ? '{' : tag), i]);
           return 1;
@@ -139,7 +139,9 @@
         if (this.tag(idx - 2) === 'HERECOMMENT') {
           idx -= 2;
         }
-        tok = ['{', '{', token[2]];
+        value = new String('{');
+        value.generated = true;
+        tok = ['{', value, token[2]];
         tok.generated = true;
         tokens.splice(idx, 0, tok);
         this.detectEnd(i + 2, condition, action);
diff --git a/src/grammar.coffee b/src/grammar.coffee
index d0322f7b..dc86b2e4 100644
--- a/src/grammar.coffee
+++ b/src/grammar.coffee
@@ -258,7 +258,7 @@ grammar =
 
   # In CoffeeScript, an object literal is simply a list of assignments.
   Object: [
-    o '{ AssignList OptComma }',                -> new Obj $2
+    o '{ AssignList OptComma }',                -> new Obj $2, $1.generated
   ]
 
   # Assignment of properties within an object literal can be separated by
diff --git a/src/nodes.coffee b/src/nodes.coffee
index 10914739..6bc5b2c3 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -157,7 +157,7 @@ exports.Expressions = class Expressions extends Base
 
   children: ['expressions']
 
-  (nodes) ->
+  constructor: (nodes) ->
     @expressions = compact flatten nodes or []
 
   # Tack an expression on to the end of this expression list.
@@ -257,7 +257,7 @@ exports.Expressions = class Expressions extends Base
 # `true`, `false`, `null`...
 exports.Literal = class Literal extends Base
 
-  (@value) ->
+  constructor: (@value) ->
 
   makeReturn: ->
     if @isPureStatement() then this else new Return this
@@ -292,7 +292,7 @@ exports.Return = class Return extends Base
   isStatement    : YES
   isPureStatement: YES
 
-  (@expression) ->
+  constructor: (@expression) ->
 
   makeReturn: THIS
 
@@ -313,7 +313,7 @@ exports.Value = class Value extends Base
   children: ['base', 'properties']
 
   # A **Value** has a base and a list of property accesses.
-  (base, props, tag) ->
+  constructor: (base, props, tag) ->
     return base if not props and base instanceof Value
     @base       = base
     @properties = props or []
@@ -329,7 +329,6 @@ exports.Value = class Value extends Base
 
   # Some boolean checks for the benefit of other nodes.
   isArray        : -> not @properties.length and @base instanceof Arr
-  isObject       : -> not @properties.length and @base instanceof Obj
   isComplex      : -> @hasProperties() or @base.isComplex()
   isAssignable   : -> @hasProperties() or @base.isAssignable()
   isSimpleNumber : -> @base instanceof Literal and SIMPLENUM.test @base.value
@@ -341,6 +340,10 @@ exports.Value = class Value extends Base
   isStatement : (o)    -> not @properties.length and @base.isStatement o
   assigns     : (name) -> not @properties.length and @base.assigns name
 
+  isObject: (onlyGenerated) ->
+    return no if @properties.length
+    (@base instanceof Obj) and (not onlyGenerated or @base.generated)
+
   makeReturn: ->
     if @properties.length then super() else @base.makeReturn()
 
@@ -401,7 +404,7 @@ exports.Value = class Value extends Base
 # at the same position.
 exports.Comment = class Comment extends Base
 
-  (@comment) ->
+  constructor: (@comment) ->
 
   isPureStatement: YES
   isStatement:     YES
@@ -420,7 +423,7 @@ exports.Call = class Call extends Base
 
   children: ['variable', 'args']
 
-  (variable, @args = [], @soak) ->
+  constructor: (variable, @args = [], @soak) ->
     @isNew    = false
     @isSuper  = variable is 'super'
     @variable = if @isSuper then null else variable
@@ -523,7 +526,7 @@ exports.Extends = class Extends extends Base
 
   children: ['child', 'parent']
 
-  (@child, @parent) ->
+  constructor: (@child, @parent) ->
 
   # Hooks one constructor into another's prototype chain.
   compile: (o) ->
@@ -538,7 +541,7 @@ exports.Accessor = class Accessor extends Base
 
   children: ['name']
 
-  (@name, tag) ->
+  constructor: (@name, tag) ->
     @proto = if tag is 'proto' then '.prototype' else ''
     @soak  = tag is 'soak'
 
@@ -555,7 +558,7 @@ exports.Index = class Index extends Base
 
   children: ['index']
 
-  (@index) ->
+  constructor: (@index) ->
 
   compile: (o) ->
     (if @proto then '.prototype' else '') + "[#{ @index.compile o, LEVEL_PAREN }]"
@@ -570,7 +573,7 @@ exports.Obj = class Obj extends Base
 
   children: ['properties']
 
-  (props) ->
+  constructor: (props, @generated = false) ->
     @objects = @properties = props or []
 
   compileNode: (o) ->
@@ -634,7 +637,7 @@ exports.Arr = class Arr extends Base
 
   children: ['objects']
 
-  (objs) ->
+  constructor: (objs) ->
     @objects = objs or []
 
   compileNode: (o) ->
@@ -661,12 +664,14 @@ exports.Class = class Class extends Base
 
   # Initialize a **Class** with its name, an optional superclass, and a
   # list of prototype property assignments.
-  (@variable, @parent, @body = new Expressions) ->
+  constructor: (@variable, @parent, @body = new Expressions) ->
 
   # Instead of generating the JavaScript string directly, we build up the
   # equivalent syntax tree and compile that, in pieces. You can see the
   # constructor, property assignments, and inheritance getting built out below.
   compileNode: (o) ->
+    ctor = null
+
     if @variable
       decl = if tail = last @variable.properties
         tail instanceof Accessor and tail.name.value
@@ -684,30 +689,34 @@ exports.Class = class Class extends Base
         node.context  = name if node.bound
 
     convert = (node) ->
-      for assign in node.base.properties
+      props = node.base.properties.slice 0
+      while assign = props.shift()
         if assign instanceof Assign
           base = assign.variable.base
-          assign.variable = new Value(lname, [new Accessor(base, 'proto')])
           delete assign.context
           func = assign.value
-          if func instanceof Code and func.bound
-            boundFuncs.push base
-            func.bound = no
+          if base.value is 'constructor'
+            if ctor
+              throw new Error 'cannot define more than one constructor in a class'
+            if func.bound
+              throw new Error 'cannot define a constructor as a bound function'
+            if func instanceof Code
+              ctor = func
+            else
+              ctor = new Assign(new Value(lname), func)
+            assign = null
+          else
+            assign.variable = new Value(lname, [new Accessor(base, 'proto')])
+            if func instanceof Code and func.bound
+              boundFuncs.push base
+              func.bound = no
         assign
 
     boundFuncs = []
     others = []
     for node, i in exps = @body.expressions
-      if node instanceof Value and node.isObject()
-        exps[i] = convert node
-      else if node instanceof Code
-        if ctor
-          throw new Error 'cannot define more than one constructor in a class'
-        if node.bound
-          throw new Error 'cannot define a constructor as a bound function'
-        ctor = node
-        exps.splice(i, 1)
-        exps.unshift ctor
+      if node instanceof Value and node.isObject(true)
+        exps[i] = compact convert node
       else
         others.push node
 
@@ -716,19 +725,20 @@ exports.Class = class Class extends Base
       other.traverseChildren false, (n2) ->
         if n2 instanceof Expressions
           for expr2, j in n2.expressions
-            if expr2 instanceof Value and expr2.isObject()
-              n2.expressions[j] = convert expr2
+            if expr2 instanceof Value and expr2.isObject(true)
+              n2.expressions[j] = compact convert expr2
           n2.expressions = flatten n2.expressions
 
     @body.expressions = exps = flatten exps
     unless ctor
-      exps.unshift ctor = new Code
+      ctor = new Code
       if @parent
         ctor.body.push new Call 'super', [new Splat new Literal 'arguments']
     ctor.ctor     = ctor.name = name
     ctor.klass    = null
     ctor.noReturn = yes
-    exps.splice 1, 0, new Extends lname, @parent if @parent
+    exps.unshift new Extends lname, @parent if @parent
+    exps.unshift ctor
     exps.push lname
 
     if boundFuncs.length
@@ -752,7 +762,7 @@ exports.Assign = class Assign extends Base
 
   children: ['variable', 'value']
 
-  (@variable, @value, @context) ->
+  constructor: (@variable, @value, @context) ->
 
   assigns: (name) ->
     @[if @context is 'object' then 'value' else 'variable'].assigns name
@@ -867,7 +877,7 @@ exports.Code = class Code extends Base
 
   children: ['params', 'body']
 
-  (params, body, tag) ->
+  constructor: (params, body, tag) ->
     @params  = params or []
     @body    = body or new Expressions
     @bound   = tag is 'boundfunc'
@@ -934,7 +944,7 @@ exports.Param = class Param extends Base
 
   children: ['name', 'value']
 
-  (@name, @value, @splat) ->
+  constructor: (@name, @value, @splat) ->
 
   compile: (o) ->
     @name.compile o, LEVEL_LIST
@@ -959,7 +969,7 @@ exports.Splat = class Splat extends Base
 
   isAssignable: YES
 
-  (name) ->
+  constructor: (name) ->
     @name = if name.compile then name else new Literal name
 
   assigns: (name) ->
@@ -999,7 +1009,7 @@ exports.While = class While extends Base
 
   isStatement: YES
 
-  (condition, options) ->
+  constructor: (condition, options) ->
     @condition = if options?.invert then condition.invert() else condition
     @guard     = options?.guard
 
@@ -1063,7 +1073,7 @@ exports.Op = class Op extends Base
 
   children: ['first', 'second']
 
-  (op, first, second, flip) ->
+  constructor: (op, first, second, flip) ->
     return new In first, second if op is 'in'
     if op is 'new'
       return first.newInstance() if first instanceof Call
@@ -1140,7 +1150,7 @@ exports.In = class In extends Base
 
   invert: NEGATE
 
-  (@object, @array) ->
+  constructor: (@object, @array) ->
 
   compileNode: (o) ->
     if @array instanceof Value and @array.isArray()
@@ -1176,7 +1186,7 @@ exports.Try = class Try extends Base
 
   isStatement: YES
 
-  (@attempt, @error, @recovery, @ensure) ->
+  constructor: (@attempt, @error, @recovery, @ensure) ->
 
   makeReturn: ->
     @attempt  = @attempt .makeReturn() if @attempt
@@ -1207,7 +1217,7 @@ exports.Throw = class Throw extends Base
 
   isStatement: YES
 
-  (@expression) ->
+  constructor: (@expression) ->
 
   # A **Throw** is already a return, of sorts...
   makeReturn: THIS
@@ -1226,7 +1236,7 @@ exports.Existence = class Existence extends Base
 
   invert: NEGATE
 
-  (@expression) ->
+  constructor: (@expression) ->
 
   compileNode: (o) ->
     code = @expression.compile o, LEVEL_OP
@@ -1251,7 +1261,7 @@ exports.Parens = class Parens extends Base
 
   children: ['expression']
 
-  (@expression) ->
+  constructor: (@expression) ->
 
   unwrap    : -> @expression
   isComplex : -> @expression.isComplex()
@@ -1281,7 +1291,7 @@ exports.For = class For extends Base
 
   isStatement: YES
 
-  (body, head) ->
+  constructor: (body, head) ->
     if head.index instanceof Value
       throw SyntaxError 'index cannot be a pattern matching expression'
     extend this, head
@@ -1415,7 +1425,7 @@ exports.Switch = class Switch extends Base
 
   isStatement: YES
 
-  (@subject, @cases, @otherwise) ->
+  constructor: (@subject, @cases, @otherwise) ->
 
   makeReturn: ->
     pair[1].makeReturn() for pair in @cases
@@ -1449,7 +1459,7 @@ exports.If = class If extends Base
 
   children: ['condition', 'body', 'elseBody']
 
-  (condition, @body, options = {}) ->
+  constructor: (condition, @body, options = {}) ->
     @condition = if options.invert then condition.invert() else condition
     @elseBody  = null
     @isChain   = false
diff --git a/src/optparse.coffee b/src/optparse.coffee
index 3b013d99..3f486783 100644
--- a/src/optparse.coffee
+++ b/src/optparse.coffee
@@ -13,7 +13,7 @@ exports.OptionParser = class OptionParser
   #     [short-flag, long-flag, description]
   #
   # Along with an an optional banner for the usage help.
-  (rules, @banner) ->
+  constructor: (rules, @banner) ->
     @rules = buildRules rules
 
   # Parse the list of arguments, populating an `options` object with all of the
diff --git a/src/rewriter.coffee b/src/rewriter.coffee
index 8013fe63..af7fe250 100644
--- a/src/rewriter.coffee
+++ b/src/rewriter.coffee
@@ -123,7 +123,9 @@ class exports.Rewriter
       else
         i - 1
       idx -= 2 if @tag(idx - 2) is 'HERECOMMENT'
-      tok = ['{', '{', token[2]]
+      value = new String('{')
+      value.generated = yes
+      tok = ['{', value, token[2]]
       tok.generated = yes
       tokens.splice idx, 0, tok
       @detectEnd i + 2, condition, action
diff --git a/src/scope.coffee b/src/scope.coffee
index 60987260..ae8e11a9 100644
--- a/src/scope.coffee
+++ b/src/scope.coffee
@@ -17,7 +17,7 @@ exports.Scope = class Scope
   # as well as a reference to the **Expressions** node is belongs to, which is
   # where it should declare its variables, and a reference to the function that
   # it wraps.
-  (@parent, @expressions, @method) ->
+  constructor: (@parent, @expressions, @method) ->
     @variables = [{name: 'arguments', type: 'arguments'}]
     @positions = {}
     if @parent
diff --git a/test/test_arguments.coffee b/test/test_arguments.coffee
index 92686b06..198332de 100644
--- a/test/test_arguments.coffee
+++ b/test/test_arguments.coffee
@@ -35,7 +35,7 @@ eq context.arg, 3
 eq context.arg.join(' '), '1 2 3'
 
 class Klass
-  (@one, @two) ->
+  constructor: (@one, @two) ->
 
 obj = new Klass 1, 2
 
diff --git a/test/test_classes.coffee b/test/test_classes.coffee
index 4c404a92..dfffa5b7 100644
--- a/test/test_classes.coffee
+++ b/test/test_classes.coffee
@@ -18,7 +18,7 @@ thirdCtor = ->
   @array = [1, 2, 3]
 
 class ThirdChild extends SecondChild
-  -> thirdCtor.call this
+  constructor: -> thirdCtor.call this
 
   # Gratuitous comment for testing.
   func: (string) ->
@@ -40,15 +40,15 @@ ok (new ThirdChild).array.join(' ') is '1 2 3'
 
 
 class TopClass
-  (arg) ->
+  constructor: (arg) ->
     @prop = 'top-' + arg
 
 class SuperClass extends TopClass
-  (arg) ->
+  constructor: (arg) ->
     super 'super-' + arg
 
 class SubClass extends SuperClass
-  ->
+  constructor: ->
     super 'sub'
 
 ok (new SubClass).prop is 'top-super-sub'
@@ -57,7 +57,7 @@ ok (new SubClass).prop is 'top-super-sub'
 class OneClass
   @new = 'new'
   function: 'function'
-  (name) -> @name = name
+  constructor: (name) -> @name = name
 
 class TwoClass extends OneClass
 delete TwoClass.new
@@ -131,10 +131,10 @@ ok obj.amI()
 
 # super() calls in constructors of classes that are defined as object properties.
 class Hive
-  (name) -> @name = name
+  constructor: (name) -> @name = name
 
 class Hive.Bee extends Hive
-  (name) -> super
+  constructor: (name) -> super
 
 maya = new Hive.Bee 'Maya'
 ok maya.name is 'Maya'
@@ -154,7 +154,7 @@ ok instance.name() is 'class'
 # ... or statically, to the class.
 class Dog
 
-  (name) ->
+  constructor: (name) ->
     @name = name
 
   bark: =>
@@ -188,7 +188,7 @@ eq (func() for func in m.generate()).join(' '), '10 10 10'
 
 # Testing a contructor called with varargs.
 class Connection
-  (one, two, three) ->
+  constructor: (one, two, three) ->
     [@one, @two, @three] = [one, two, three]
 
   out: ->
@@ -281,12 +281,10 @@ classMaker = ->
     @value = inner
 
 class One
-  ctor = classMaker()
-  -> return new ctor
+  constructor: classMaker()
 
 class Two
-  ctor = classMaker()
-  -> return new ctor
+  constructor: classMaker()
 
 ok (new One).value is 1
 ok (new Two).value is 2
diff --git a/test/test_comprehensions.coffee b/test/test_comprehensions.coffee
index 2195f6d1..2a89f459 100644
--- a/test/test_comprehensions.coffee
+++ b/test/test_comprehensions.coffee
@@ -146,7 +146,7 @@ ok expr(2, 4, 8).join(' ') is '4 16 64'
 
 # Fast object comprehensions over all properties, including prototypal ones.
 class Cat
-  -> @name = 'Whiskers'
+  constructor: -> @name = 'Whiskers'
   breed: 'tabby'
   hair:  'cream'
 
diff --git a/test/test_existence.coffee b/test/test_existence.coffee
index 6ba016a3..8c8e2bb7 100644
--- a/test/test_existence.coffee
+++ b/test/test_existence.coffee
@@ -81,7 +81,7 @@ eq ident(non?.existent().method()), undefined, 'soaks inner values'
 # Soaks constructor invocations.
 a = 0
 class Foo
-  -> a += 1
+  constructor: -> a += 1
   bar: "bat"
 
 ok (new Foo())?.bar is 'bat'