proc.c: fix arity of rest keywords argument

* proc.c (rb_iseq_min_max_arity): maximum argument is unlimited if
  having rest keywords argument.  [ruby-core:53298] [Bug #8072]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44413 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index 2acce84da3..7dd93bee9d 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -77,6 +77,13 @@ 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(-3, proc{|x, y=0, *z, w, **o|}.arity)
 
     assert_equal(0, lambda{}.arity)
     assert_equal(0, lambda{||}.arity)
@@ -95,6 +102,13 @@ class TestProc < Test::Unit::TestCase
     assert_equal(2, lambda{|(x, y), z|[x,y]}.arity)
     assert_equal(-2, lambda{|(x, y), z=0|[x,y]}.arity)
     assert_equal(-4, lambda{|x, *y, z, a|}.arity)
+    assert_equal(-1, lambda{|**|}.arity)
+    assert_equal(-1, lambda{|**o|}.arity)
+    assert_equal(-2, lambda{|x, **o|}.arity)
+    assert_equal(-1, lambda{|x=0, **o|}.arity)
+    assert_equal(-2, lambda{|x, y=0, **o|}.arity)
+    assert_equal(-3, lambda{|x, y=0, z, **o|}.arity)
+    assert_equal(-3, lambda{|x, y=0, *z, w, **o|}.arity)
 
     assert_arity(0) {}
     assert_arity(0) {||}
@@ -104,6 +118,10 @@ class TestProc < Test::Unit::TestCase
     assert_arity(-3) {|x, *y, z|}
     assert_arity(-1) {|*x|}
     assert_arity(-1) {|*|}
+    assert_arity(-1) {|**o|}
+    assert_arity(-1) {|**|}
+    assert_arity(-2) {|x, *y, **|}
+    assert_arity(-3) {|x, *y, z, **|}
   end
 
   def m(x)