[ruby-core:65837] [ruby-trunk - Bug #10413] [Open] Unexpected block invocation with unknown keywords

Issue #10413 has been reported by Koichi Sasada.

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Bug #10413: Unexpected block invocation with unknown keywords
https://bugs.ruby-lang.org/issues/10413

* Author: Koichi Sasada
* Status: Open
* Priority: Normal
* Assignee: Koichi Sasada
* Category: core
* Target version: current: 2.2.0
* ruby -v: 2.2dev
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED
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When unknown keywords are passed, unexpected block is invoked.

```ruby
def bar(k2: 'v2')
end

def foo
  bar(k1: 1)
end

foo(){
  puts caller_locations
  raise "unreachable"
}
```

current behavior:

```
ruby 2.2.0dev (2014-10-22 trunk 48083) [i386-mswin32_110]
test.rb:10:in `block in <main>': unreachable (RuntimeError)
	from test.rb:5:in `foo'
	from test.rb:8:in `<main>'
test.rb:5:in `foo'
test.rb:8:in `<main>'
```

expected: 

```
../../gitruby/test.rb:5:in `foo': unknown keyword: k1 (ArgumentError)
        from ../../gitruby/test.rb:8:in `<main>'
```

This strange behavior is because "unknown_keyword_error" in class.c calls rb_hash_delete() (Hash#delete) with :k1 and invoke passed block.

I'm now re-writing all of this part and my branch does not have this problem.
However, Ruby 2.0 and 2.1 have same problem.





-- 
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