diff --git a/ruby/Rakefile b/ruby/Rakefile
index bf533d4..ca9dddc 100644
--- a/ruby/Rakefile
+++ b/ruby/Rakefile
@@ -7,7 +7,12 @@ namespace :test do
   desc "Run tests on source changes"
   task :watch do
     loop do
-      sh "fd .*.rb | entr -d rake test:isolated"
+      sh <<~SH
+        while true
+        do
+          fd .*.rb | entr -d rake test:isolated
+        done
+      SH
     end
   end
 end
diff --git a/ruby/lib/lox/resolver.rb b/ruby/lib/lox/resolver.rb
new file mode 100644
index 0000000..1321adf
--- /dev/null
+++ b/ruby/lib/lox/resolver.rb
@@ -0,0 +1,33 @@
+module Lox
+  class Resolver
+
+    def initialize(interpreter)
+      @interpreter = interpreter
+
+      @scopes = []
+    end
+
+    def resolve(values)
+      values.each do
+        value.accept(self)
+      end
+    end
+
+    def visit_block(stmt)
+      with_scope do
+        resolve(stmt.stmts)
+      end
+      nil
+    end
+
+    private
+
+    def with_block
+      @scopes.push({})
+      yield
+      @scopes.pop
+    end
+
+
+  end
+end