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	The vm1_ prefix and vm2_ had had special meaning until820ad9cb1dand12068aa4e9. AFAIK there's no special meaning in vm3_ prefix. As they have confused people (like "In `benchmark` what is difference between `vm1_`, `vm2_` and `vm3_`"), I'd like to remove the obsoleted prefix as we obviated that two years ago.
		
			
				
	
	
		
			22 lines
		
	
	
	
		
			252 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
			
		
		
	
	
			22 lines
		
	
	
	
		
			252 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
# get last backtrace
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begin
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  caller(0, 0)
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rescue ArgumentError
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  alias caller_orig caller
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  def caller lev, n
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    caller_orig(lev)[0..n]
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  end
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end
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def rec n
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  if n < 0
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    100_000.times{
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      caller(0, 1)
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    }
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  else
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    rec(n-1)
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  end
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end
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rec 50
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