erb.rb: duplicated magic comments [Fix GH-1229]

* lib/erb.rb (ERB#def_method): insert def line just before the
  first non-comment and non-empty line, not to leave duplicated
  and stale magic comments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53684 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 3 deletions

diff --git a/lib/erb.rb b/lib/erb.rb
index 2e9fad98b4..7c22ec2efa 100644
--- a/lib/erb.rb
+++ b/lib/erb.rb
@@ -905,10 +905,9 @@ class ERB
   #   erb.def_method(MyClass, 'render(arg1, arg2)', filename)
   #   print MyClass.new.render('foo', 123)
   def def_method(mod, methodname, fname='(ERB)')
-    src = self.src
-    magic_comment = "#coding:#{@encoding}\n"
+    src = self.src.sub(/^(?!#|$)/) {"def #{methodname}\n"} << "\nend\n"
     mod.module_eval do
-      eval(magic_comment + "def #{methodname}\n" + src + "\nend\n", binding, fname, -2)
+      eval(src, binding, fname, -1)
     end
   end