Simplify fix for #4464

This uses more of the existing machinery for moving class body
expressions into the initializer.

Author: connec

lib/coffeescript/nodes.js

@@ -1636,16 +1636,17 @@ exports.Class = class Class extends Base
     super()
 
   compileNode: (o) ->
-    @name = @determineName()
-    @walkBody()
+    @name          = @determineName()
+    executableBody = @walkBody()
 
     # Special handling to allow `class expr.A extends A` declarations
     parentName    = @parent.base.value if @parent instanceof Value and not @parent.hasProperties()
     @hasNameClash = @name? and @name is parentName
 
     node = @
-    if @executableBody or @hasNameClash
-      node = new ExecutableClassBody node, @executableBody
+
+    if executableBody or @hasNameClash
+      node = new ExecutableClassBody node, executableBody
     else if not @name? and o.level is LEVEL_TOP
       # Anonymous classes are only valid in expressions
       node = new Parens node
@@ -1665,7 +1666,7 @@ exports.Class = class Class extends Base
 
   compileClassDeclaration: (o) ->
     @ctor ?= @makeDefaultConstructor() if @externalCtor or @boundMethods.length
-    @ctor?.noReturn = yes
+    @ctor?.noReturn = true
 
     @proxyBoundMethods() if @boundMethods.length
 
@@ -1677,14 +1678,10 @@ exports.Class = class Class extends Base
     result.push @makeCode('extends '), @parent.compileToFragments(o)..., @makeCode ' ' if @parent
 
     result.push @makeCode '{'
-    unless @passthroughBody.isEmpty() and @body.isEmpty()
-      @body.spaced = yes
+    unless @body.isEmpty()
+      @body.spaced = true
       result.push @makeCode '\n'
-      unless @passthroughBody.isEmpty()
-        result.push @passthroughBody.compileToFragments(o, LEVEL_TOP)...
-        result.push @makeCode '\n\n' unless @body.isEmpty()
-      unless @body.isEmpty()
-        result.push @body.compileToFragments(o, LEVEL_TOP)...
+      result.push @body.compileToFragments(o, LEVEL_TOP)...
       result.push @makeCode "\n#{@tab}"
     result.push @makeCode '}'
 
@@ -1707,21 +1704,21 @@ exports.Class = class Class extends Base
     if name in JS_FORBIDDEN then "_#{name}" else name
 
   walkBody: ->
-    @ctor         = null
-    @boundMethods = []
+    @ctor          = null
+    @boundMethods  = []
+    executableBody = null
 
-    initializer                = []
-    passthroughBodyExpressions = []
-    { expressions }            = @body
+    initializer     = []
+    { expressions } = @body
 
     i = 0
-    for expression, expressionIndex in expressions.slice()
-      if expression instanceof Value and expression.isObject yes
+    for expression in expressions.slice()
+      if expression instanceof Value and expression.isObject true
         { properties } = expression.base
         exprs     = []
         end       = 0
         start     = 0
-        pushSlice = -> exprs.push new Value new Obj properties[start...end], yes if end > start
+        pushSlice = -> exprs.push new Value new Obj properties[start...end], true if end > start
 
         while assign = properties[end]
           if initializerExpression = @addInitializerExpression assign
@@ -1734,9 +1731,6 @@ exports.Class = class Class extends Base
 
         expressions[i..i] = exprs
         i += exprs.length
-      else if expression instanceof Value and expression.base instanceof PassthroughLiteral
-        passthroughBodyExpressions.push expression
-        expressions.splice expressionIndex, 1
       else
         if initializerExpression = @addInitializerExpression expression
           initializer.push initializerExpression
@@ -1752,19 +1746,15 @@ exports.Class = class Class extends Base
       else if method.bound
         @boundMethods.push method
 
-    @passthroughBody = new Block passthroughBodyExpressions
-
     if initializer.length isnt expressions.length
       @body.expressions = (expression.hoist() for expression in initializer)
-      @executableBody = new Block expressions
-
+      new Block expressions
 
   # Add an expression to the class initializer
-  #
-  # NOTE Currently, only methods and static methods are valid in ES class initializers.
-  # When additional expressions become valid, this method should be updated to handle them.
   addInitializerExpression: (node) ->
-    if @validInitializerMethod node
+    if node.unwrapAll() instanceof PassthroughLiteral
+      node
+    else if @validInitializerMethod node
       @addInitializerMethod node
     else
       null