Mixin a function into a struct only if no member with that name already exists

Tobias Pankrath tobias at pankrath.net
Wed Dec 29 10:14:13 UTC 2021

I am trying to implement the builder pattern for some structs. 
Currently I am auto implementing all methods by mixing them into 
the builder, but now I need some custom logic for some of the 
fields and I figured I just write them down by hand and mixin the 

I tried checking if it is contained in the FieldNameTuple, but 
that (understandably) creates a circular reference: 

How do I mixin a function only if it is not already present?

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