Code Duplication    Length = 3-3 lines in 2 locations

Contrib/less.php/Less.php 2 locations

@@ 3406-3408 (lines=3) @@
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			$dark = $this->rgba(0, 0, 0, 1.0);
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		}
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		if (!$dark instanceof Less_Tree_Color) {
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			throw new Less_Exception_Compiler('The second argument to contrast must be a color' . ($dark instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
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		}
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		if (!$light instanceof Less_Tree_Color) {
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			throw new Less_Exception_Compiler('The third argument to contrast must be a color' . ($light instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
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		}
@@ 3409-3411 (lines=3) @@
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		if (!$dark instanceof Less_Tree_Color) {
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			throw new Less_Exception_Compiler('The second argument to contrast must be a color' . ($dark instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
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		}
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		if (!$light instanceof Less_Tree_Color) {
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			throw new Less_Exception_Compiler('The third argument to contrast must be a color' . ($light instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
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		}
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		//Figure out which is actually light and dark!
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		if( $dark->luma() > $light->luma() ){