< Rebol Programming  
        
      USAGE:
DELTA-TIME block
DESCRIPTION:
Delta-time - returns the time it takes to evaluate the block.
DELTA-TIME is a function value.
ARGUMENTS
- block -- (Type: block)
 
SOURCE CODE
delta-time: func [
    {Delta-time - returns the time it takes to evaluate the block.} 
    block [block!] /local 
    start
][
    start: now/precise 
    do block 
    difference now/precise start
]
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