Handle sclass

Author: kddnewton

lib/syntax_tree/visitor/compiler.rb

@@ -1876,6 +1876,19 @@ def visit_rest_param(node)
         current_iseq.argument_size += 1
       end
 
+      def visit_sclass(node)
+        visit(node.target)
+        builder.putnil
+
+        singleton_iseq =
+          with_instruction_sequence(:class, "singleton class", current_iseq, node) do
+            visit(node.bodystmt)
+            builder.leave
+          end
+
+        builder.defineclass(:singletonclass, singleton_iseq, VM_DEFINECLASS_TYPE_SINGLETON_CLASS)
+      end
+
       def visit_statements(node)
         statements =
           node.body.select do |statement|

test/compiler_test.rb

@@ -378,6 +378,8 @@ class CompilerTest < Minitest::Test
       "class ::Foo::Bar < Baz; end",
       "class Foo; class Bar < Baz; end; end",
       "class Foo < baz; end",
+      "class << Object; end",
+      "class << ::String; end",
       # Block
       "foo do end",
       "foo {}",