* proc.c: Having optional keyword arguments makes maximum arity +1, not unlimited [#8072]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44432 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Dec 26 06:27:08 2013  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
+
+	* proc.c: Having optional keyword arguments makes maximum arity +1,
+	  not unlimited [#8072]
+
 Thu Dec 26 01:09:57 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* tool/release.sh: make symbolic links.

proc.c

@@ -877,8 +877,9 @@ proc_arity(VALUE self)
 static inline int
 rb_iseq_min_max_arity(const rb_iseq_t *iseq, int *max)
 {
-    *max = (iseq->arg_rest == -1 && iseq->arg_keyword == -1) ?
-        iseq->argc + iseq->arg_post_len + iseq->arg_opts - (iseq->arg_opts > 0)
+    *max = iseq->arg_rest == -1 ?
+	iseq->argc + iseq->arg_post_len + iseq->arg_opts -
+	(iseq->arg_opts > 0) + (iseq->arg_keyword != -1)
       : UNLIMITED_ARGUMENTS;
     return iseq->argc + iseq->arg_post_len;
 }

test/ruby/test_proc.rb

@@ -77,12 +77,12 @@ class TestProc < Test::Unit::TestCase
     assert_equal(2, proc{|(x, y), z|[x,y]}.arity)
     assert_equal(1, proc{|(x, y), z=0|[x,y]}.arity)
     assert_equal(-4, proc{|x, *y, z, a|}.arity)
-    assert_equal(-1, proc{|**|}.arity)
-    assert_equal(-1, proc{|**o|}.arity)
-    assert_equal(-2, proc{|x, **o|}.arity)
-    assert_equal(-1, proc{|x=0, **o|}.arity)
-    assert_equal(-2, proc{|x, y=0, **o|}.arity)
-    assert_equal(-3, proc{|x, y=0, z, **o|}.arity)
+    assert_equal(0, proc{|**|}.arity)
+    assert_equal(0, proc{|**o|}.arity)
+    assert_equal(1, proc{|x, **o|}.arity)
+    assert_equal(0, proc{|x=0, **o|}.arity)
+    assert_equal(1, proc{|x, y=0, **o|}.arity)
+    assert_equal(2, proc{|x, y=0, z, **o|}.arity)
     assert_equal(-3, proc{|x, y=0, *z, w, **o|}.arity)
 
     assert_equal(0, lambda{}.arity)