maintain optional support for older rubies

lib/pry-rescue/source_location.rb

@@ -1,14 +1,15 @@
-
 if binding.respond_to?(:source_location)
   raise 'source_location exists by default in Ruby 2.6 and greater, no need to required it manually'
 else
   class PryRescue
     module SourceLocation
-      DEPRECATION_TIME = Time.new(2021,4,1)
-
-      WithRuby2_5 = ->(b){ [b.eval("__FILE__"), b.eval("__LINE__")] }
+      def self.call(b)
+        [b.eval("__FILE__"), b.eval("__LINE__")]
+      end
     end
   end
 
-  Binding.define_method(:source_location, &PryRescue::SourceLocation::WithRuby2_5)
+  Binding.define_method :source_location do
+    PryRescue::SourceLocation.call(self)
+  end
 end

spec/source_location_spec.rb

@@ -1,5 +1,7 @@
 describe 'PryRescue::SourceLocation' do
   if RUBY_VERSION < "2.6.0"
+    require 'pry-rescue/source_location'
+
     subject { binding.source_location }
 
     it 'matches [file, line]' do