Hello, I am attempting to implement two new constraint entailment rules which dictate how to implement a new constraint form "CodeC" can be used to satisfy constraints. The main idea is that all constraints store the level they they are introduced and required (in the Template Haskell sense of level) and that only constraints of the right level can be used. The "CodeC" constraint form allows the level of constraints to be manipulated. Therefore the two rules In order to implement this I want to add two constraint rewriting rules in the following way: 1. If in a given, `CodeC C @ n` ~> `C @ n+1` 2. If in a wanted `CodeC C @ n` -> `C @ n - 1` Can someone give me some pointers about the specific part of the constraint solver where I should add these rules? I am unsure if this rewriting of wanted constraints already occurs or not. Cheers, Matt