[fpc-pascal] Compiler option to check return value ignorance

[leledumbo]

Vinzent Höfler wrote:
> 
> Yes. Turn Extended Syntax off {$X-}, then a function result must be 
> assigned to a variable. At least it used to be that way.
> ...
> so "inherited Create" did not compile anymore (and I remember that any 
> attempt to assign this "result" to a dummy variable even failed). So, at 
> that time I turned the extended syntax stuff back on.
> 

So, if I don't use any classes, turning Extended Syntax Off would be OK?
What's activated by this Extended Syntax anyway? Any document/article about
it?
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