Fix immediately invoked named classes (#4569)

Fixes #4436.

lib/coffeescript/nodes.js

@@ -1769,28 +1769,27 @@
       }
 
       compileNode(o) {
-        var assign, executableBody, parentName, result;
+        var executableBody, node, parentName;
         this.name = this.determineName();
         executableBody = this.walkBody();
         if (this.parent instanceof Value && !this.parent.hasProperties()) {
           parentName = this.parent.base.value;
         }
         this.hasNameClash = (this.name != null) && this.name === parentName;
+        node = this;
         if (executableBody || this.hasNameClash) {
-          this.compileNode = this.compileClassDeclaration;
-          result = new ExecutableClassBody(this, executableBody).compileToFragments(o);
-          this.compileNode = this.constructor.prototype.compileNode;
-        } else {
-          result = this.compileClassDeclaration(o);
-          if ((this.name == null) && o.level === LEVEL_TOP) {
-            result = this.wrapInParentheses(result);
-          }
+          node = new ExecutableClassBody(node, executableBody);
+        } else if ((this.name == null) && o.level === LEVEL_TOP) {
+          node = new Parens(node);
         }
         if (this.variable) {
-          assign = new Assign(this.variable, new Literal(''), null, {moduleDeclaration: this.moduleDeclaration});
-          return [...assign.compileToFragments(o), ...result];
-        } else {
-          return result;
+          node = new Assign(this.variable, node, null, {moduleDeclaration: this.moduleDeclaration});
+        }
+        this.compileNode = this.compileClassDeclaration;
+        try {
+          return node.compileToFragments(o);
+        } finally {
+          delete this.compileNode;
         }
       }
 

src/nodes.coffee

@@ -1300,21 +1300,22 @@ exports.Class = class Class extends Base
     parentName    = @parent.base.value if @parent instanceof Value and not @parent.hasProperties()
     @hasNameClash = @name? and @name is parentName
 
-    if executableBody or @hasNameClash
-      @compileNode = @compileClassDeclaration
-      result = new ExecutableClassBody(@, executableBody).compileToFragments o
-      @compileNode = @constructor::compileNode
-    else
-      result = @compileClassDeclaration o
+    node = @
 
+    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
-      result = @wrapInParentheses result if not @name? and o.level is LEVEL_TOP
+      node = new Parens node
 
     if @variable
-      assign = new Assign @variable, new Literal(''), null, { @moduleDeclaration }
-      [ assign.compileToFragments(o)..., result... ]
-    else
-      result
+      node = new Assign @variable, node, null, { @moduleDeclaration }
+
+    @compileNode = @compileClassDeclaration
+    try
+      return node.compileToFragments o
+    finally
+      delete @compileNode
 
   compileClassDeclaration: (o) ->
     @ctor ?= @makeDefaultConstructor() if @externalCtor

test/classes.coffee

@@ -734,6 +734,10 @@ test "#1392 calling `super` in methods defined on namespaced classes", ->
   eq 5, (new C.a).m()
 
 
+test "#4436 immediately instantiated named class", ->
+  ok new class Foo
+
+
 test "dynamic method names", ->
   class A
     "#{name = 'm'}": -> 1