Proc#curry should preserve lambdas

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

@@ -13,9 +13,11 @@ class Proc
   end
 
   def curry(arity=self.arity)
+    type = :proc
     abs = lambda {|a| a < 0 ? -a - 1 : a}
     arity = abs[arity]
     if lambda?
+      type = :lambda
       self_arity = self.arity
       if (self_arity >= 0 && arity != self_arity) ||
          (self_arity < 0 && abs[self_arity] > arity)
@@ -25,7 +27,7 @@ class Proc
 
     pproc = self
     make_curry = proc do |given_args=[]|
-      proc do |*args|
+      send(type) do |*args|
         new_args = given_args + args
         if new_args.size >= arity
           pproc[*new_args]

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

@@ -41,6 +41,9 @@ assert('Proc#curry') do
   assert_raise(ArgumentError) { b.curry[1, 2][3, 4] }
   assert_raise(ArgumentError) { b.curry(5) }
   assert_raise(ArgumentError) { b.curry(1) }
+
+  assert_false(proc{}.curry.lambda?)
+  assert_true(lambda{}.curry.lambda?)
 end
 
 assert('Proc#parameters') do