Index: lib/erb.rb
===================================================================
--- lib/erb.rb	(revision 21686)
+++ lib/erb.rb	(working copy)
@@ -847,10 +847,10 @@
   module DefMethod
     public
   # define _methodname_ as instance method of current module, using ERB object or eRuby file
-    def def_erb_method(methodname, erb_or_fname)
+    def def_erb_method(methodname, erb_or_fname, safe_level=nil, trim_mode=nil, eoutvar='_erbout')
       if erb_or_fname.kind_of? String
         fname = erb_or_fname
-        erb = ERB.new(File.read(fname))
+        erb = ERB.new(File.read(fname), safe_level, trim_mode, eoutvar)
         erb.def_method(self, methodname, fname)
       else
         erb = erb_or_fname
Index: test/erb/trim_hello.erb
===================================================================
--- test/erb/trim_hello.erb	(revision 0)
+++ test/erb/trim_hello.erb	(revision 0)
@@ -0,0 +1,4 @@
+= hello
+<%- 3.times do |n| -%>
+* <%= n %>
+<%- end -%>
Index: test/erb/test_erb.rb
===================================================================
--- test/erb/test_erb.rb	(revision 21686)
+++ test/erb/test_erb.rb	(working copy)
@@ -235,6 +235,11 @@
       def_erb_method('hello_world', erb)
     end
     assert(klass.new.respond_to?('hello_world'))    
+
+    klass.module_eval do
+      def_erb_method('trim_hello', File.join(File.dirname(File.expand_path(__FILE__)), 'trim_hello.erb'), nil, '-')
+    end
+    assert(klass.new.respond_to?('trim_hello'))    
   end
 
   def test_escape