Remove parsed expression cache.

lib/liquid/context.rb

@@ -24,7 +24,6 @@ module Liquid
       @resource_limits  = resource_limits || Template.default_resource_limits.dup
       @resource_limits[:render_score_current] = 0
       @resource_limits[:assign_score_current] = 0
-      @parsed_expression = Hash.new{ |cache, markup| cache[markup] = Expression.parse(markup) }
       squash_instance_assigns_with_environments
 
       @this_stack_used = false
@@ -170,7 +169,7 @@ module Liquid
     # Example:
     #   products == empty #=> products.empty?
     def [](expression)
-      evaluate(@parsed_expression[expression])
+      evaluate(Expression.parse(expression))
     end
 
     def has_key?(key)

test/unit/context_unit_test.rb

@@ -469,16 +469,6 @@ class ContextUnitTest < Minitest::Test
 
     refute mock_any.has_been_called?
     assert mock_empty.has_been_called?
-  end 
-
-  def test_variable_lookup_caches_markup
-    mock_scan = Spy.on_instance_method(String, :scan).and_return(["string"])
-
-    @context['string'] = 'string'
-    @context['string']
-    @context['string']
-
-    assert_equal 1, mock_scan.calls.size
   end
 
   def test_context_initialization_with_a_proc_in_environment