[Agda] Info about instance resolution in macro

[Joris Ceulemans]

Hello,


When defining a macro, is it possible to get information on whether 
instance resolution for a specific instance metavariable succeeds or not 
and based on that do different things?

Attached is a small example of what I have in mind. I tried working with 
"noConstraints" but that doesn't work (or at least not the way that I 
use it).


Best,

Joris

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