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

[leledumbo]

Joost van der Sluis wrote:
> 
> And there's no way the compiler can detect this.
> 
I don't think so. The compiler understand that a procedure doesn't return a
value while a function does (i.e. trying to return a value from a procedure
causes compile error). I haven't checked how compiler formats each
function/procedure in the PPU but I think there should be an information
whether it's a function or procedure. So, I think it's possible to detect if
a function call is assigned to a variable or not.
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