NewCompiler and Preferences compileBlocksAsClosures

Marcus Denker denker at
Mon Oct 16 13:09:04 UTC 2006

On 16.10.2006, at 10:51, Klaus D. Witzel wrote:

> List,
> the value of Preferences compileBlocksAsClosures can have a meaning
> - for a single or a group of methods
> - for all methods of one or more classes
> - for the lifetime of the current session
> - forever

If you set this preference to true, new methods are compiled with the  
closures. Even when you turn it off, these methods keep on having  
closure semantics.

> It is easy to predict problems when a method was compiled with  
> Preferences compileBlocksAsClosures set true and, after it was  
> distributed, whoever loads it has Preferences  
> compileBlocksAsClosures set false.


> Wouldn't it be time to make Preferences compileBlocksAsClosures a  
> pragma (a method property), in the sense of a compiler directive,  
> in the scope of the method being (re-)compiled.

I don't think this is that good... we want to be able to recompile  
the whole image with closures without needing to put a pragma in all  


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