11878: fix: Paper over GAT panic r=flodiebold a=flodiebold
TIL that Chalk expects the arguments to a generic associated type to come *before* the ones for the parent trait, not *after* as we have been doing with all other nested generics. Fixing this requires a larger refactoring, so for now this just papers over the problem by completely ignoring parameters of associated types.
Fixes#11769.
Co-authored-by: Florian Diebold <flodiebold@gmail.com>
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