[plt-scheme] Not able to use for or for/list in DrScheme

'm running Pretty Big in 4.02 and get the following

Welcome to DrScheme, version 4.0.2 [3m].
Language: Pretty Big (includes MrEd and Advanced Student); memory  
limit: 128 megabytes.
 > (for ([i '(1 2 3)]) (display i))
. . reference to undefined identifier: for

By contrast, in mzscheme, I get

~:$ mzscheme
Welcome to MzScheme v4.0.2 [3m], Copyright (c) 2004-2008 PLT Scheme Inc.
 > (for ([i '(1 2 3)]) (display i))
123>

as expected.

Is there another language setting I should be using?

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and wise; but if the insight comes too late,
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