From f810d1804a7e1c2dbdb2d4d6c0406674a1912ea3 Mon Sep 17 00:00:00 2001
From: marcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 1 Feb 2013 22:46:32 +0000
Subject: [PATCH] * proc.c (proc_curry): Fix arity check [Bug #5747]

* test/ruby/test_proc.rb: Test for above

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39008 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog              |  6 ++++++
 proc.c                 | 15 +++++----------
 test/ruby/test_proc.rb |  7 +++++++
 3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index a4e0edf611..06e8e69dfb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sat Feb  2 07:45:44 2013  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
+
+	* proc.c (proc_curry): Fix arity check [Bug #5747]
+
+	* test/ruby/test_proc.rb: Test for above
+
 Sat Feb  2 07:44:15 2013  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* proc.c: Add {*}_min_max_arity and refactor.
diff --git a/proc.c b/proc.c
index b2c2b70b0e..07c43dfe00 100644
--- a/proc.c
+++ b/proc.c
@@ -2163,22 +2163,17 @@ curry(VALUE dummy, VALUE args, int argc, VALUE *argv, VALUE passed_proc)
 static VALUE
 proc_curry(int argc, VALUE *argv, VALUE self)
 {
-    int sarity, marity = rb_proc_arity(self);
-    VALUE arity, opt = Qfalse;
-
-    if (marity < 0) {
-	marity = -marity - 1;
-	opt = Qtrue;
-    }
+    int sarity, max_arity, min_arity = rb_proc_min_max_arity(self, &max_arity);
+    VALUE arity;
 
     rb_scan_args(argc, argv, "01", &arity);
     if (NIL_P(arity)) {
-	arity = INT2FIX(marity);
+	arity = INT2FIX(min_arity);
     }
     else {
 	sarity = FIX2INT(arity);
-	if (rb_proc_lambda_p(self) && (sarity < marity || (sarity > marity && !opt))) {
-	    rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)", sarity, marity);
+	if (rb_proc_lambda_p(self)) {
+	    rb_check_arity(sarity, min_arity, max_arity);
 	}
     }
 
diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index ca716a696c..dc426ddda5 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -270,6 +270,13 @@ class TestProc < Test::Unit::TestCase
     assert_equal(self, result[1])
   end
 
+  def test_curry_optional_params
+    obj = Object.new
+    def obj.foo(a, b=42); end
+    assert_raise(ArgumentError) { obj.method(:foo).to_proc.curry(3) }
+    assert_raise(ArgumentError) { ->(a, b=42){}.curry(3) }
+  end
+
   def test_dup_clone
     b = proc {|x| x + "bar" }
     class << b; attr_accessor :foo; end