Andy, thank you.

In case there would be a choice between ugly and achievable, I must take 
the last one:-)

Another thing I have found it that it is impossible to use type as a 
parameter when you call to a function.
How to pass type to function argument in Go - Stack Overflow 
<https://stackoverflow.com/questions/51097211/how-to-pass-type-to-function-argument-in-go>

Thank you.

пятница, 17 марта 2023 г. в 02:12:22 UTC+3, Andy Balholm: 

> I would guess that in the case of AST nodes, you're likely more interested 
> in the *identity* of the nodes than their *values*. In that case, you 
> should use the pointers to the nodes as your map keys.
>
> If the *values* truly are what you care about, use the go/format package 
> to convert the node back to source code, and use the resulting string as 
> your map key.
>
> On Thursday, March 16, 2023 at 3:24:49 PM UTC-7 alex-coder wrote:
>
>> >> Sure, convert to a string and use that as a map key.
>> :-) no, no, no. it looks very very ugly.
>>
>> четверг, 16 марта 2023 г. в 00:26:35 UTC+3, Ian Lance Taylor: 
>>
>>> On Wed, Mar 15, 2023 at 2:16 PM alex-coder <a.gus...@gmail.com> wrote: 
>>> > 
>>> > Ian, thank you. 
>>> > but may be the is any workaround ? 
>>> > Use as a key not directly but like a derived from those 
>>> interface/structure types ? 
>>> > Of course I may declare key like string and use switch + .(type) to 
>>> mimic it. 
>>>
>>> Sure, convert to a string and use that as a map key. 
>>>
>>> By the way, I should say that although you can't use `ast.Field` as a 
>>> map key type, you can use `*ast.Field`. Of course then two different 
>>> Field values that happen to look exactly the same will get different 
>>> map entries. So it kind of depends on what you want to do. 
>>>
>>> Ian 
>>>
>>

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