Should call initialize method if defined

src/proc.c

@@ -151,6 +151,7 @@ static mrb_value
 mrb_proc_s_new(mrb_state *mrb, mrb_value proc_class)
 {
   mrb_value blk;
+  mrb_value proc;
   struct RProc *p;
 
   mrb_get_args(mrb, "&", &blk);
@@ -160,7 +161,9 @@ mrb_proc_s_new(mrb_state *mrb, mrb_value proc_class)
   }
   p = (struct RProc *)mrb_obj_alloc(mrb, MRB_TT_PROC, mrb_class_ptr(proc_class));
   mrb_proc_copy(p, mrb_proc_ptr(blk));
-  return mrb_obj_value(p);
+  proc = mrb_obj_value(p);
+  mrb_funcall_with_block(mrb, proc, mrb_intern_lit(mrb, "initialize"), 0, NULL, blk);
+  return proc;
 }
 
 static mrb_value

test/t/proc.rb

@@ -136,6 +136,18 @@ assert('Proc#return_does_not_break_self') do
   assert_equal c, c.block.call
 end
 
+assert('call Proc#initialize if defined') do
+  a = []
+  c = Class.new(Proc) do
+    define_method(:initialize) do
+      a << :ok
+    end
+  end
+
+  assert_kind_of c, c.new{}
+  assert_equal [:ok], a
+end
+
 assert('&obj call to_proc if defined') do
   pr = Proc.new{}
   def mock(&b)