Use `__send__` instead of `send`.

mrbgems/mruby-proc-ext/mrblib/proc.rb

@@ -27,7 +27,7 @@ class Proc
 
     pproc = self
     make_curry = proc do |given_args=[]|
-      send(type) do |*args|
+      __send__(type) do |*args|
         new_args = given_args + args
         if new_args.size >= arity
           pproc[*new_args]