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	This fixes instance_exec and similar methods. It also fixes
Enumerator::Yielder#yield, rb_yield_block, and a couple of cases
with Proc#{<<,>>}.
This support requires the addition of rb_yield_values_kw, similar to
rb_yield_values2, for passing the keyword flag.
Unlike earlier attempts at this, this does not modify the rb_block_call_func
type or add a separate function type.  The functions of type
rb_block_call_func are called by Ruby with a separate VM frame, and we can
get the keyword flag information from the VM frame flags, so it doesn't need
to be passed as a function argument.
These changes require the following VM functions accept a keyword flag:
* vm_yield_with_cref
* vm_yield
* vm_yield_with_block
		
	
			
		
			
				
	
	
		
			16 lines
		
	
	
	
		
			401 B
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			16 lines
		
	
	
	
		
			401 B
		
	
	
	
		
			C
		
	
	
	
	
	
#include <ruby.h>
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static VALUE
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yield_block(int argc, VALUE *argv, VALUE self)
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{
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    rb_check_arity(argc, 1, UNLIMITED_ARGUMENTS);
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    return rb_block_call_kw(self, rb_to_id(argv[0]), argc-1, argv+1, rb_yield_block, 0, RB_PASS_CALLED_KEYWORDS);
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}
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void
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Init_yield(VALUE klass)
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{
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    VALUE yield = rb_define_module_under(klass, "Yield");
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    rb_define_method(yield, "yield_block", yield_block, -1);
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}
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