How can we make it easier to experiment with the compiler

[Ola Fosheim Grøstad]

On Tuesday, 25 May 2021 at 04:21:08 UTC, Ola Fosheim Grostad 
wrote:
> Nobody that has read an introductory book on compilers need a 
> comment explaining a function that is looking up a symbol from 
> a symboltable. If that is a problem, improve the name, use a 
> longer name.

An improvement that would have made any comment on 
"lookup(symbol)" superfluous is to have a signature that 
indicates whether a returned pointer can be null or not.