vm_args.c: arity check of lambda

* vm_eval.c (rb_yield_lambda): new function which yields an array
  to a proc and splat to a lambda.  mainly for Enumerable only.

* vm_args.c (setup_parameters_complex): remove special lambda
  splatting for [Bug #9605].  [ruby-core:77065] [Bug #12705]

* vm_insnhelper.c (vm_callee_setup_block_arg): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58019 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_lambda.rb b/test/ruby/test_lambda.rb
index 826bfcf203..3ac2e4cb98 100644
--- a/test/ruby/test_lambda.rb
+++ b/test/ruby/test_lambda.rb
@@ -101,6 +101,12 @@ class TestLambdaParameters < Test::Unit::TestCase
     assert_equal(:ok, x, bug13090)
   end
 
+  def test_arity_error
+    assert_raise(ArgumentError, '[Bug #12705]') do
+      [1, 2].tap(&lambda {|a, b|})
+    end
+  end
+
   def foo
     assert_equal(nil, ->(&b){ b }.call)
   end