13.2

ruby/lib/lox/lox_class.rb

@@ -9,7 +9,10 @@ module Lox
       @name, @superclass, @methods = name, superclass, methods
     end
 
-    def find_method(name) = @methods[name]
+    def find_method(name)
+      @methods.fetch(name) { @superclass&.find_method(name) }
+    end
+
     def to_s = name
 
     def call(interpreter, args)

ruby/test/lox/test_interpreter.rb

@@ -470,6 +470,20 @@ class TestInterpreter < Lox::Test
     end
   end
 
+  def test_inheriting_methods
+    assert_interpreted "Fry until golden brown.", <<~SRC
+      class Doughnut {
+        cook() {
+          print "Fry until golden brown.";
+        }
+      }
+
+      class BostonCream < Doughnut {}
+
+      BostonCream().cook();
+    SRC
+  end
+
   private
 
   def assert_interpreted(expected, src)