Fix code generator for (::Foo = bar)

lib/opal/grammar.y

@@ -363,6 +363,9 @@ lhs:
       result = s(:colon2, val[0], val[2].intern)
     }
   | '::@' CONSTANT
+    {
+      result = s(:colon3, val[1].intern)
+    }
   | backref
 
 cname:

lib/opal/grammar_helpers.rb

@@ -222,6 +222,10 @@ def new_assign(lhs, rhs)
         lhs << rhs
         lhs[0] = :casgn
         lhs
+      when :colon3
+        lhs << rhs
+        lhs[0] = :casgn3
+        lhs
       else
         raise "Bad lhs for new_assign: #{lhs[0]}"
       end

lib/opal/parser.rb

@@ -2049,6 +2049,11 @@ def process_colon3(exp, level)
       end
     end
 
+    def process_casgn3(sexp, level)
+      cid, rhs = sexp
+      [f("$opal.Object._scope.#{cid} = "), process(rhs)]
+    end
+
     # super a, b, c
     #
     # s(:super, arg1, arg2, ...)

spec/filters/bugs/class.rb

@@ -0,0 +1,6 @@
+opal_filter "Class" do
+  fails "Class.new raises a TypeError if passed a metaclass"
+  fails "Class.new creates a class that can be given a name by assigning it to a constant"
+  fails "Class.new raises a TypeError when given a non-Class"
+  fails "Class#new passes the block to #initialize"
+end

spec/rubyspecs

@@ -229,3 +229,4 @@ core/matchdata/to_a_spec
 core/range/begin_spec
 core/range/end_spec
 core/symbol/to_proc_spec
+core/class/new_spec