7 files changed, 30 insertions, 13 deletions
diff --git a/actionview/lib/action_view/dependency_tracker.rb b/actionview/lib/action_view/dependency_tracker.rb
index 7716955fd9..5a4c3ea3fe 100644
--- a/actionview/lib/action_view/dependency_tracker.rb
+++ b/actionview/lib/action_view/dependency_tracker.rb
@@ -1,4 +1,4 @@
-require 'concurrent'
+require 'concurrent/map'
 require 'action_view/path_set'
 
 module ActionView
diff --git a/actionview/lib/action_view/digestor.rb b/actionview/lib/action_view/digestor.rb
index 12e9723a02..6f2f9ca53c 100644
--- a/actionview/lib/action_view/digestor.rb
+++ b/actionview/lib/action_view/digestor.rb
@@ -1,4 +1,4 @@
-require 'concurrent'
+require 'concurrent/map'
 require 'action_view/dependency_tracker'
 require 'monitor'
 
diff --git a/actionview/lib/action_view/helpers/url_helper.rb b/actionview/lib/action_view/helpers/url_helper.rb
index 5684de35e8..baebc34b4b 100644
--- a/actionview/lib/action_view/helpers/url_helper.rb
+++ b/actionview/lib/action_view/helpers/url_helper.rb
@@ -41,11 +41,21 @@ module ActionView
       end
 
       def _back_url # :nodoc:
-        referrer = controller.respond_to?(:request) && controller.request.env["HTTP_REFERER"]
-        referrer || 'javascript:history.back()'
+        _filtered_referrer || 'javascript:history.back()'
       end
       protected :_back_url
 
+      def _filtered_referrer # :nodoc:
+        if controller.respond_to?(:request)
+          referrer = controller.request.env["HTTP_REFERER"]
+          if referrer && URI(referrer).scheme != 'javascript'
+            referrer
+          end
+        end
+      rescue URI::InvalidURIError
+      end
+      protected :_filtered_referrer
+
       # Creates an anchor element of the given +name+ using a URL created by the set of +options+.
       # See the valid options in the documentation for +url_for+. It's also possible to
       # pass a String instead of an options hash, which generates an anchor element that uses the
diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index ec6edfaaa3..d3935788ef 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -1,4 +1,4 @@
-require 'concurrent'
+require 'concurrent/map'
 require 'active_support/core_ext/module/remove_method'
 require 'active_support/core_ext/module/attribute_accessors'
 require 'action_view/template/resolver'
diff --git a/actionview/lib/action_view/renderer/partial_renderer.rb b/actionview/lib/action_view/renderer/partial_renderer.rb
index 39c8658ffe..a78bf0a6e9 100644
--- a/actionview/lib/action_view/renderer/partial_renderer.rb
+++ b/actionview/lib/action_view/renderer/partial_renderer.rb
@@ -1,5 +1,5 @@
 require 'action_view/renderer/partial_renderer/collection_caching'
-require 'concurrent'
+require 'concurrent/map'
 
 module ActionView
   class PartialIteration
diff --git a/actionview/lib/action_view/template.rb b/actionview/lib/action_view/template.rb
index 0ed208f27e..15fc2b71a3 100644
--- a/actionview/lib/action_view/template.rb
+++ b/actionview/lib/action_view/template.rb
@@ -325,7 +325,7 @@ module ActionView
             template = refresh(view)
             template.encode!
           end
-          raise Template::Error.new(template, e)
+          raise Template::Error.new(template)
         end
       end
 
diff --git a/actionview/lib/action_view/template/error.rb b/actionview/lib/action_view/template/error.rb
index 390bce98a2..b03b197cb5 100644
--- a/actionview/lib/action_view/template/error.rb
+++ b/actionview/lib/action_view/template/error.rb
@@ -59,13 +59,20 @@ module ActionView
     class Error < ActionViewError #:nodoc:
       SOURCE_CODE_RADIUS = 3
 
-      attr_reader :original_exception
+      def initialize(template, original_exception = nil)
+        if original_exception
+          ActiveSupport::Deprecation.warn("Passing #original_exception is deprecated and has no effect. " \
+                                          "Exceptions will automatically capture the original exception.", caller)
+        end
+
+        super($!.message)
+        set_backtrace($!.backtrace)
+        @template, @sub_templates = template, nil
+      end
 
-      def initialize(template, original_exception)
-        super(original_exception.message)
-        @template, @original_exception = template, original_exception
-        @sub_templates = nil
-        set_backtrace(original_exception.backtrace)
+      def original_exception
+        ActiveSupport::Deprecation.warn("#original_exception is deprecated. Use #cause instead.", caller)
+        cause
       end
 
       def file_name